Estimate goods emissions without supplier carbon data
Use an official spend-based multiplier matched to the goods category to make an initial estimate when usable supplier data are missing. Multiply compatible spending by that multiplier, record assumptions and disclose the method. Ask Cambridge China Bridge to help gather supporting factory records.
Start with a screening estimate
DESNZ guidance allows spend-based methods where activity data are insufficient. It identifies Defra's spend-based multipliers as a way to assess supply-chain emissions initially. Treat the result as a screening estimate, rather than a measured footprint of your Chinese factory or product.
Define the purchasing period and goods covered before calculating. Record missing supplier information explicitly. Use the estimate to identify categories worth investigating; avoid using it to rank factories whose actual production emissions remain unknown.
Choose the right official dataset
Look for the spend-based emissions multipliers alongside Defra's UK and England carbon footprint publication. These differ from the activity-based conversion factors in the DESNZ annual reporting publication. Do not multiply an invoice value by a factor intended for fuel, electricity or distance.
Read the multiplier workbook's notes before choosing a category. Check its emissions measure, monetary unit, data year, price basis and coverage. Record the exact category and explain any imperfect match. For goods supplied directly to overseas buyers, check suitability before applying a dataset framed around UK demand.
Prepare spending that matches the multiplier
Build a worksheet from purchasing records, separating goods from freight, services and other charges. Our landed price guide explains the cost components; use it to unpack the total rather than automatically treating every landed-cost item as goods spending.
Express eligible spending in the monetary unit and price basis specified by the dataset, then multiply it by the matching category multiplier. Keep the currency conversion source, adjustments and exclusions beside the calculation. Check coverage before adding separate freight estimates, so overlapping emissions are not counted again.
Use screening to target factory questions
Sort the estimated totals by purchasing category and prioritise categories with large estimates or weak matches. A change in spending can reflect prices, currency or order volume, so investigate before describing a lower estimate as an emissions reduction.
Ask the factory for material composition, product weights, production routes, energy records and the explanation of how shared production data are allocated to your goods. Request supporting records and their reporting period. Cambridge China Bridge's staff in China can help pursue these questions; agree the evidence needed before accepting a replacement estimate.
Disclose the estimate and its limitations
DESNZ guidance says users should report their emissions accounting methods. Include the dataset and version, category mapping, purchasing period, spend basis, currency treatment, coverage, exclusions and missing information. Explain where estimates have been combined with supplier data and how overlap was handled.
Suggested wording: “Purchased-goods emissions were estimated from purchasing expenditure using category-level spend-based multipliers because usable supplier activity data were unavailable. The estimate supports screening and does not measure this factory's production.” Keep the calculation reproducible. Before making customer-facing claims, consult our environmental claims guide.
Frequently asked questions
Can I estimate emissions without supplier carbon data?
Yes. Use a spend-based estimate for initial screening, document the category match and spending basis, and disclose the missing supplier data and estimation method.
Which government factors should I use for spending?
Look for Defra's spend-based emissions multipliers alongside the UK and England carbon footprint publication. Check the workbook notes; activity factors for fuel or distance cannot be applied to invoice spending.
Should I multiply my whole landed cost?
Do not use the total automatically. Separate goods, freight and other charges, then check what the selected multiplier covers and how its spending basis is defined.
Does a cheaper supplier have lower emissions?
A lower spend-based result can reflect a lower price rather than cleaner production. Ask for comparable production evidence before using the estimate to choose between factories.