Product Carbon Footprint Calculation for Japanese Customers

An email arrives from your Japanese customer's purchasing or sustainability team: please report the CFP of each part you supply, in kg-CO2e per piece, "cradle to gate," using primary data where possible. Sometimes it comes as an Excel survey (chosa-hyo) with a deadline. CFP is the term Japanese guidance uses for a product carbon footprint, and suppliers to Japanese manufacturers, especially in the automotive supply chain, are seeing the request more often.

The short answer: a product carbon footprint is the sum of "activity data × emission factor" across the product's life cycle, and for parts and materials the boundary usually ends at your shipping dock. Most of the data you need is already in your purchasing, production, and utility records, and a spreadsheet is enough to do the math. The hard part is deciding what goes inside the boundary and which data to use, then writing those choices down so your customer can trust the number.

This guide explains what Japanese customers are asking for and why, walks through a seven-step calculation based on the Japanese government's CFP guidance, and ends with questions to ask your customer and English reply templates you can adapt.

Figure 1: Product Carbon Footprint vs. Corporate Emissions (Scope 1, 2, 3)

Both measure greenhouse gases, but a CFP counts per product, while Scope 1, 2, and 3 count per company.

Product carbon footprint (CFP/PCF)

Corporate emissions (Scope 1, 2, 3)

Unit counted

One product (per piece, per kg, etc.)

A whole company or site (usually one year)

Expressed as

kg-CO2e/piece, etc.

t-CO2e/year, etc.

Boundary

The product life cycle. For parts and materials, often raw materials through shipment

Own fuel use (Scope 1), purchased electricity and heat (Scope 2), the rest of the value chain (Scope 3)

Main uses

Data for customers, product-level reduction planning, product labels

Annual reports and other disclosures, company-wide targets

Main rules

ISO 14067, GHG Protocol Product Standard, METI/MOE CFP Guideline (Japan)

GHG Protocol Corporate Standard and Scope 3 Standard

When your customer calculates its Scope 3, your product CFP becomes one of its inputs.

Contents

1. What Is a Product Carbon Footprint (CFP)?
2. Why Japanese Customers Are Asking for Your CFP
3. The Seven Steps of a CFP Calculation
4. How to Answer the Request
5. Common Mistakes and How to Avoid Them
6. Japanese Terms You May See in the Request
7. Questions to Ask Your Japanese Customer
8. English Reply Templates
9. Where This Guide Stops
10. Summary
11. FAQ
12. Sources

What Is a Product Carbon Footprint (CFP)?

A product carbon footprint is the total greenhouse gas (GHG) emitted over a product's life cycle, expressed as an amount of CO2. In Japanese documents it appears as カーボンフットプリント (kabon futtopurinto) or simply CFP, short for "Carbon Footprint of Products." Many companies and frameworks outside Japan, such as PACT, call the same thing a PCF. The life cycle is split into five stages:

1. Raw material acquisition
2. Production
3. Distribution and sales
4. Use and maintenance
5. End of life (disposal and recycling)

Gases other than CO2, such as methane and nitrous oxide, are converted with their global warming potential (GWP), a factor that says how many times more warming a gas causes than CO2. The result is stated in kg-CO2e (kilograms of CO2 equivalent) per unit of product, such as per piece or per kg.

The math is simple. You split the life cycle into processes, multiply each process's activity data (the amount of material, electricity, or transport used) by an emission factor (emissions per unit of that activity), and add up the results. Because it is only multiplication and addition, a spreadsheet handles it.

The Rules Japanese Customers Follow

In May 2023, Japan's Ministry of Economy, Trade and Industry (METI) and Ministry of the Environment (MOE) published the Carbon Footprint Guideline. They also publish a hands-on companion, the CFP Practical Guide (CFP jissen gaido), which they revise periodically; the latest edition is dated March 2026. The guideline is built to be consistent with the international standard ISO 14067:2018 and the GHG Protocol Product Standard, so if your team already works to either standard, much of the method will be familiar. Even so, confirm which rules your customer requires.

The METI/MOE guidance separates two levels of alignment with ISO 14067: "conformance" (junkyo), which meets every requirement and recommendation, and "reference" (sansho), which meets the main requirements. The guidance treats "reference" as the realistic, common level for now, and the Practical Guide's steps are written at that level. If your customer asks whether your number is "ISO 14067 compliant," ask which of the two it means.

Why Japanese Customers Are Asking for Your CFP

Your Parts Are Their Scope 3, Category 1

Scope 3 covers emissions in a company's value chain outside its own operations, divided into 15 categories. Emissions from making the parts and materials a company buys fall into Category 1 (purchased goods and services), which is often the largest upstream source of Scope 3 emissions regardless of industry.

Finished-product makers have usually estimated Category 1 by multiplying purchase spend or purchased weight by industry-average emission factors. With that method, nothing a supplier does to save energy or switch to renewable power shows up in the customer's numbers. That is why customers increasingly ask suppliers for product-specific CFPs (cradle to gate) to replace the averages. For a supplier, a CFP is how your own reductions reach your customer's books.

Figure 2: How a Supplier's CFP Flows into the Customer's Scope 3

Each tier adds its own process emissions to the CFP it receives and passes the total downstream.

Material makerMakes steel, resin, etc. Provides the material CFP to the parts maker

Material + material CFP

Parts maker (you)Material CFP + your machining, transport, and other emissions = part CFP (to shipment)

Part + part CFP

Finished-product maker (your customer)Received CFP × purchased quantity, totaled as Scope 3 Category 1

With industry-average factors, the customer's number does not change when a supplier cuts emissions. With supplier-specific CFPs (primary data), it does.

Based on the approach of the Green x Digital Consortium "CO2 Visualization Framework."

Mandatory Disclosure in Japan

One driver is mandatory sustainability disclosure for large listed companies in Japan. Under the Cabinet Office Order amended in February 2026, companies listed on the Tokyo Stock Exchange Prime Market must report sustainability information in their annual securities reports, following standards set by the Sustainability Standards Board of Japan (SSBJ). Rollout goes by market capitalization: JPY 3 trillion or more from the fiscal year ending March 2027, and JPY 1 trillion or more from the fiscal year ending March 2028. A January 2026 working group report of the Financial System Council, an advisory body to the Financial Services Agency (FSA), also set out a plan to cover companies of JPY 500 billion or more from the fiscal year ending March 2029. The same report says third-party assurance will start in the fiscal year after each company first applies the standards, limited to Scope 1 and 2, governance, and risk management for the first two years.

The SSBJ standards require Scope 3 to be disclosed by category, along with the activity data, emission factors, and assumptions used, and how far primary data (data obtained directly from suppliers and other value-chain partners) was used. For the disclosing company, supplier-specific data on key parts and materials makes its numbers more accurate and easier to defend.

An Example: Automotive Supply Chains

The automotive industry is one clear example. In 2021, Toyota asked its tier 1 suppliers to cut CO2 emissions by 3% from the previous year, a request that was expected to flow down to their own suppliers, according to press reports. The Japan Auto Parts Industries Association (JAPIA) publishes LCI calculation guidelines and a calculation tool for parts makers. On data exchange, the Green x Digital Consortium's CO2 Visualization Framework is based on the WBCSD Partnership for Carbon Transparency (PACT) Pathfinder Framework, and Japan's Ouranos Ecosystem completed a 2025 proof of concept with Europe's Catena-X to exchange battery carbon footprint data. If your customer names one of these, ask for its English documentation.

The Seven Steps of a CFP Calculation

The METI/MOE CFP Practical Guide organizes the work in three stages: set the calculation policy, define the scope, and calculate. Below, those stages are broken into seven steps that match how a parts or materials supplier actually does the work.

Figure 3: Seven Steps to a Product CFP

Set the policy, lock down scope and data, then calculate and report.

Set the policy

STEP 01Confirm purpose and customer requirementsWhy you are calculating. Any rules or forms the customer specifies

STEP 02Choose products and calculation unitStart with one to a few products. Per piece or per kg. To shipment or to end of life

Lock down scope and data

STEP 03Draw a life cycle flow diagramList materials and processes, and set the system boundary

STEP 04Collect activity dataMaterial weight, electricity and fuel, packaging, waste, transport distance

STEP 05Select emission factorsSupplier CFPs (primary data) or secondary databases such as IDEA

Calculate and report

STEP 06Set allocation, cut-off, and scenariosRecord how shared equipment is split and what is excluded

STEP 07Calculate and write the reportTotal in a spreadsheet and send to the customer with your assumptions

Steps 1–3 of the CFP Practical Guide (METI and MOE, March 2026), split into working steps.

The guide stresses finishing one rough calculation first instead of aiming for perfection. The first result shows which processes emit the most, which tells you where to spend effort on better data.

You will produce three internal documents: a life cycle flow diagram, a calculation procedure (a written record of rules and assumptions), and a calculation sheet (a spreadsheet). None of them needs to be published. Write them in enough detail, confidential information included, that a new person could reproduce the same number. They also become your evidence if a third party verifies the CFP later.

Step 1: Confirm the Purpose and Customer Requirements

Start by deciding why you are calculating. ISO and other international rules do not fix a detailed calculation method, so the company doing the calculation decides how precise to be, which means how much effort to spend, based on the purpose.

When the purpose is answering a customer, the customer's rules and forms become your starting assumptions. Check whether it specifies the period, unit, boundary, and acceptable databases before you start; it saves rework later. The checklist further down lists what to ask.

If you also want to use the CFP for your own reductions or for sales, align it with your company-wide decarbonization policy. The Japanese guide suggests looking at both sides: the CFP as a way to win business and as a way to reduce risk.

Step 2: Choose the Products, Calculation Unit, and Life Cycle Stages

Start with one product or a few. The guide recommends balancing impact (high total emissions, flagship products) against effort (simple processes, complete purchasing and production records).

The unit is normally defined by the product's function, but intermediate products such as parts and materials can use "per piece" or "per kg." Your customer multiplies your CFP by its purchase quantity, so match the unit to the customer's order unit.

For a final product, the default stages run from raw materials to end of life, called cradle to grave. For an intermediate product, they run from raw materials to shipment, called cradle to gate. How a part is used and discarded depends on the finished product it goes into, so parts suppliers usually calculate only to shipment.

Figure 4: Life Cycle Stages and Calculation Boundary

For parts, materials, and other intermediate products, the default covers raw materials and production (to shipment).

1. Raw materialsMaking materials, transport to your plant

2. ProductionPower and fuel for processing and assembly, packaging, waste

3. DistributionTransport after shipment, warehousing

4. UseElectricity or water used in service

5. End of lifeCollection transport, treatment

Cradle to gate (default for intermediate products)

Cradle to grave (default for final products)

If a customer asks an intermediate-product supplier to cover use or end of life, check the specific guideline or product category rules that apply.

Step 3: Draw a Life Cycle Flow Diagram and Set the Boundary

Next, put every process related to the product on one diagram, the life cycle flow diagram. Deciding what falls inside it is called setting the system boundary. Lay the life cycle stages along the horizontal axis, put materials and waste ("things") and machining, assembly, and transport ("processes") in boxes, and connect them with arrows.

For a parts maker, the boundary typically covers purchasing each material and shipping it to your plant, your in-house processes, packaging, and treatment of scrap and other process waste. Number every process and use the same numbers in the procedure and the spreadsheet so nothing is missed. Working from the bill of materials (BOM) and the process routing makes it easier to capture every material and step.

Step 4: Collect Activity Data

Activity data shows how much each process used or moved. The Japanese guide treats primary data (measured values, or measured values allocated to the product) as the default and allows assumptions, called scenarios, when data is hard to get. Parts makers usually collect:

• Raw materials: material weight from the BOM, plus input weight including scrap
• Purchased components: quantities and weights from purchasing records, and the supplier
• Electricity and fuel: plant or line meter readings, usage on utility bills
• Packaging: cartons, cushioning, and pallets used
• Waste: amounts of scrap, waste oil, and so on, and how each is treated
• Transport: shipped weight and distance (ton-kilometers), vehicle size

Production output and material inputs are often already in your production control system, MES, or ERP, so check what you can pull from there first. Many plants have only a main electricity meter. The more you meter by line or machine, the more accurately you can assign electricity to a product.

Step 5: Select Emission Factors

For raw materials, use your own suppliers' CFPs as primary data when you can get them. Otherwise, use values from a secondary database. Japanese customers commonly work with:

• AIST-IDEA from Japan's National Institute of Advanced Industrial Science and Technology (AIST), with about 4,700 emission factors based on Japanese data
• MOE's emission factor database for calculating supply chain GHG emissions (Japanese)
• ecoinvent, widely used in Europe and the US, with more than 18,000 datasets

For electricity, Japanese companies often use utility-specific factors published by MOE and METI. Those factors cover only emissions at the power plant, so a CFP also needs the upstream emissions from producing and delivering the fuel. Japanese grid factors apply only to plants in Japan; for a plant in the US, India, or Southeast Asia, ask your customer which electricity factor source it accepts.

Figure 5: Emission Factor Data, in Order of Preference

Higher rows reflect a specific supplier's actual performance. Move high-emission materials up the ladder over time.

1st choice

Supplier-specific CFP (primary data)A CFP your supplier calculated for its material or part, multiplied by the weight or count you buy. Reflects your supplier's reductions

2nd choice

Quantity-based secondary dataMaterial weight or count × a material-specific factor from AIST-IDEA or a similar database. An average for that material type

3rd choice

Spend-based secondary dataPurchase spend × a factor from input-output tables. Easy, but often far from the product's actual emissions

Based on the Scope 3 Category 1 methods in the SSBJ handbook (supplier-specific, average-data, and spend-based). Product CFPs rely mainly on the first two.

If no database entry matches, use a similar item or another database. When several candidates fit, the guide's default is to pick the larger emission factor and err on the conservative side.

Run your data requests to your own suppliers through purchasing, alongside its normal supplier management, so priorities and contacts stay aligned. You do not need primary data from every supplier at once; start with the materials responsible for the most emissions.

Step 6: Record Allocation, Cut-Off, and Scenarios

Plant electricity and fuel are usually shared across many products. Splitting that shared use among products is allocation, based on units produced, weight, revenue, machine hours, or similar. The rule is to avoid allocation where you can, by separating data at the line or machine level. When you do allocate, write down the basis and use the same one every time; it is what lets you explain the number later.

Processes with small impact that are hard to calculate can be excluded; this is cut-off. In the guide's model projects, excluded items were kept under 5% of emissions within the boundary (under 5% of total material weight for materials). Keep cut-offs to a minimum and list what you excluded, and its effect, in the report.

Where measurement is difficult, such as transport distance, calculate with stated assumptions (scenarios). Record those in the procedure too, and look for ways to replace them with measured values next time.

Step 7: Calculate and Write the CFP Report

For each process, list the activity data, emission factor, the factor's source and dataset name, and units, then multiply and add. To avoid calculation errors, express activity data in the unit the emission factor is per (for example, kWh for a factor in kg-CO2e/kWh).

Figure 6: Sample Calculation Sheet (per Metal Part)

List activity data × emission factor for each process, then add.

Process

Activity data

Emission factor

Emissions

1. Making material A

0.50 kg

2.0 kg-CO2e/kg

1.000

2. Transporting material A (supplier to plant)

0.05 tkm

0.2 kg-CO2e/tkm

0.010

3. Machining electricity (after allocation)

1.5 kWh

0.45 kg-CO2e/kWh

0.675

4. Packaging (cardboard)

0.05 kg

1.0 kg-CO2e/kg

0.050

5. Scrap treatment

0.05 kg

0.1 kg-CO2e/kg

0.005

Total (to shipment)

1.74

Fictional values to show the calculation flow; they are not real factors for any material or grid. A real sheet also records each factor's source (database, version, dataset name) and each activity data source (department, document). Unit: kg-CO2e/piece.

Once the total is done, look at the breakdown by stage and process. Seeing in numbers which materials and processes deserve primary data is one of the main payoffs of the first calculation.

Finally, document the method and result in a CFP report. The METI/MOE guideline lists 20 items for the report, but when sharing it outside the company you may select the items to provide, taking confidentiality into account. The guideline also separates public "labeling" (hyoji) of a number from one-to-one "disclosure" (kaiji) to a business customer; answering a customer request is disclosure.

How to Answer the Request

Requests arrive through a dedicated portal or form, an Excel survey, or a single email. In every case, agree on the conditions before you calculate. A number built on unclear conditions often cannot be combined with other suppliers' data on the customer's side and ends up being resubmitted.

Five Things to Confirm First

• Product and unit: by part number or product family, per piece or per kg
• Life cycle scope: to your shipment, or including delivery to the customer
• Period: which fiscal year or months of actual data to use
• Method: a product-level calculation, or an allocation of company-wide emissions
• Format and deadline, and whether you must report the share of primary data or data quality

Product-Based vs. Organization-Based Answers

There are two ways to produce CO2 data for a customer. A product-based calculation builds up the life cycle of each product. An organization-based calculation takes your company's Scope 1, 2, and 3 totals and allocates a share to each customer.

Figure 7: Product-Based vs. Organization-Based Calculation

Organization-based is faster; product-based is closer to what actually happens on your line.

Product-based (CFP)

Organization-based

Starting point

Builds up each product from BOM, process, and machine-level data

Allocates company-wide Scope 1, 2, and 3 to each customer by shipped volume, revenue, etc.

Main rules

ISO 14067, GHG Protocol Product Standard, METI/MOE CFP Guideline, product category rules

Accepted by the GHG Protocol Scope 3 Standard when product-level data is not available

Strength

Shows differences in materials and processes, and your suppliers' reductions

Uses your existing corporate inventory, so it is quick

Watch out for

Data collection and rule setting take effort

Can include emissions from unrelated products. Must be labeled as not product-based

Based on the Green x Digital Consortium "CO2 Visualization Framework," which treats organization-based data as an interim approach and recommends a gradual move to product-based data.

Because organization-based sharing is widespread in practice, the framework accepts it, but it requires you to state the method you used. Answering organization-based first and switching key products to product-based over time is a realistic path.

What to Share, and Database Licenses

Your calculation sheet holds confidential information: material ratios, suppliers, process conditions. Send the CFP value and a summary of assumptions, and decide internally where to stop so that costs or formulations cannot be inferred.

Also check the license of each emission factor database. The METI/MOE guide warns that some databases restrict publishing their values or passing them to other companies, so read the terms before you send a breakdown that shows database factors.

Common Mistakes and How to Avoid Them

Figure 8: Common CFP Mistakes and Fixes

Most are prevented by decisions and records made before any math.

Calculating before setting the boundaryFix: confirm the customer's requirements and fix the scope on a flow diagram first

Trying to get primary data for every material up frontFix: finish once with secondary data, then replace the biggest emitters

Allocation basis changes each timeFix: write the basis and reason in the procedure and keep it across years

Only one person understands the sheetFix: record factor sources, dataset names, and assumptions so anyone can reproduce it

To a customer, a CFP is valuable not only because the number is low but because you can explain how you got it. Finish one calculation, widen the share of primary data, and get third-party verification when needed. Improving accuracy a little each year gives you a CFP that holds up over time.

Once you know which processes emit the most, you can also target reductions. The guide suggests two angles: using less (more efficient materials and processes) and lowering the emission factor (new materials or processes, renewable electricity, fuel switching).

Japanese Terms You May See in the Request

Japanese	Romaji	Meaning
カーボンフットプリント / CFP	kabon futtopurinto	Product carbon footprint (PCF)
1次データ	ichiji deta	Primary data (supplier-specific or measured)
2次データ	niji deta	Secondary data (database averages)
排出係数 / 排出原単位	haishutsu keisu / haishutsu gentan'i	Emission factor
活動量	katsudo-ryo	Activity data
算定報告書	santei hokokusho	CFP calculation report
配分	haibun	Allocation
カットオフ	katto ofu	Cut-off (excluded items)
製品ベース / 組織ベース	seihin besu / soshiki besu	Product-based / organization-based

Questions to Ask Your Japanese Customer

Send these before you start. They expand the five checks above into a list you can paste into an email or attach to the survey.

• Which part numbers are in scope, and should we report per piece or per kg?
• Is the boundary cradle to gate (to our shipment), or should we include transport to your plant?
• Which period should the data cover (for example, your fiscal year April–March, or calendar year)?
• Do you need a product-based CFP, or is an organization-based allocation acceptable for now?
• Do you follow a specific rule set (METI/MOE CFP Guideline, ISO 14067, GHG Protocol Product Standard, JAPIA, PACT, or your own rules)?
• Which emission factor databases and electricity factors are acceptable for a plant outside Japan?
• Should we report the share of primary data, a data quality rating, or a breakdown by stage?
• Is third-party verification required, now or later?
• What format and portal should we use, and what is the deadline?
• Who can we contact with questions, and can we receive the guidance in English?

English Reply Templates

Adapt these to your situation. Names, dates, and numbers in brackets are placeholders.

Where This Guide Stops

• Each customer can set its own rules, forms, and databases. When its instructions differ from this guide, follow the customer.
• Some industries and product categories have their own calculation rules, which may set boundaries, allocation, or data quality requirements differently from the general guidance described here.
• The Japanese guidance is revised periodically. Check the current editions of the METI/MOE documents, ISO 14067, and any rules your customer names.
• This guide covers calculation for supplier-to-customer disclosure. Public labels, marketing claims, and regulatory filings, such as the EU Battery Regulation carbon footprint declaration, have separate requirements.

Summary

A CFP is not a job for the environmental team alone. It needs the people who hold material data, production records, and supplier contacts, usually quality, production control, and purchasing.

Related: Purchasing Process at Japanese Manufacturers: 8 Steps

FAQ

What is the difference between a CFP and a PCF?

They mean the same thing. Japanese government guidance uses CFP (Carbon Footprint of Products), while many companies and frameworks outside Japan say PCF (product carbon footprint). Both refer to life cycle GHG emissions per unit of product, in kg-CO2e.

Which standard do Japanese customers use for product carbon footprints?

Japan's main reference is the METI/MOE Carbon Footprint Guideline (2023) and its CFP Practical Guide, which are designed to be consistent with ISO 14067:2018 and the GHG Protocol Product Standard. Automotive customers may also point to JAPIA guidelines or PACT-based data exchange. Ask your customer which one applies.

Do I need to calculate cradle to grave?

Usually not. Parts and materials suppliers normally report cradle to gate (raw materials through shipment), because use and end of life depend on the customer's finished product. Confirm whether the customer also wants transport to its plant included.

Can I answer without primary data from my own suppliers?

Yes. The Japanese guidance encourages finishing a first calculation with secondary database values and then replacing the highest-emitting materials with supplier-specific data. State in your answer which data is secondary.

Can I send an organization-based number instead of a product CFP?

It can work as an interim answer, but confirm that your customer accepts it. The Green x Digital Consortium framework allows organization-based data but requires you to state the method, and it recommends moving to product-based data over time.

Sources

• Calculation steps, databases, cut-off, and report: METI and MOE, Carbon Footprint Guideline (Appendix) CFP Practical Guide, March 2026 (Japanese)
• Guideline: METI and MOE, Carbon Footprint Guideline, May 2023 (Japanese)
• CFP overview: MOE Green Value Chain Platform, Carbon Footprint (Japanese)
• Primary data, Scope 3, and product- vs. organization-based data: Green x Digital Consortium, CO2 Visualization Framework Edition 2.0.1, September 2024 (Edition 3.0, published in 2026, keeps the same view of organization-based data as interim); English Edition 1.0 announcement: JEITA press release, June 30, 2023
• Scope 3 category disclosure and calculation methods: SSBJ Handbook, Measurement and Disclosure of Scope 3 GHG Emissions, October 2025 (Japanese)
• Mandatory SSBJ disclosure: FSA, amendment of the Cabinet Office Order on disclosure, February 20, 2026 (Japanese); Financial System Council working group report, January 8, 2026 (Japanese)
• Toyota supplier request: Japan Today (Reuters), "Toyota asks parts suppliers to reduce carbon emissions," 2021
• JAPIA LCI calculation guidelines: JAPIA, LCI calculation guidelines for automotive parts
• Ouranos Ecosystem and Catena-X: IPA, "Catena-X and Ouranos Ecosystem Successfully Demonstrate Data Space Interoperability," March 31, 2025