How do I calculate CO2e from a refrigerant leak?

Multiply the mass of refrigerant released by its 100-year global warming potential. When both are expressed on the same mass basis, kilograms of refrigerant multiplied by GWP gives kilograms of CO2e.

What if I know the system charge and leak rate but not the leaked mass?

Estimate leaked mass as full refrigerant charge multiplied by annual leak rate, number of systems, and years. This assumes the equipment remains at its full charge basis and the same annual rate applies throughout the period.

Does equipment charge mean the same thing as leaked mass?

No. Charge is the full refrigerant capacity of equipment. Leaked mass is only the portion released. Enter charge only in the charge and leak-rate mode.

How are refrigerant blends handled?

The calculator uses a published GWP for the named blend. Do not select a blend based only on similar digits; use the exact refrigerant designation on the equipment or service record.

Can this result be used for mandatory greenhouse-gas reporting?

It is suitable for screening and transparent internal estimates. Mandatory reporting may prescribe a specific GWP table, inventory boundary, material-balance method, rounding rule, and verification process; use the custom factor and official method when required.

Are my refrigerant inputs uploaded?

No. Calculations, copying, and CSV creation run in your browser. The page does not send the values you enter to a server.

Refrigerant Leak CO2e Calculator

Convert a known refrigerant loss—or an estimate from full charge and annual leak rate—into kg and metric tonnes of CO₂e. Your values stay in your browser.

Leak details

What information do you have?

Known leaked mass Charge + leak rate

Refrigerant and GWP Refrigerant

R-410A GWP100 = 1,924. EPA Greenhouse Gas Equivalencies Calculator, AR5 basis.

Known refrigerant loss

Leaked or emitted amountUse measured loss or a documented service top-up estimate. Mass unit

Result

5 lb of R-410A equals about 4.36 metric tonnes CO₂e.

Total climate impact4.36 t CO₂e4,364 kg CO₂e

Refrigerant emitted2.268 kg5.000 lb

GWP100 used1,924EPA AR5 blend factor

Calculation steps

Convert mass: 5 lb × 0.45359237 = 2.267962 kg
Apply GWP: 2.267962 kg × 1,924 = 4,363.56 kg CO₂e
Convert result: 4,363.56 kg ÷ 1,000 = 4.36356 t CO₂e

This is the direct climate impact of the refrigerant release only. It does not include electricity use, manufacturing, transport, or disposal energy.

Last reviewedAugust 3, 2026

Core equationRefrigerant mass × GWP100

Rate methodEPA operating-emissions screening equation

PrivacyNo input upload or input tracking

How to Use the Refrigerant Leak Calculator

Choose your evidence. Use known leaked mass for measured loss or service top-up records. Use charge + leak rate for a screening estimate.
Select the exact refrigerant. Check the equipment nameplate or service record. Similar refrigerant numbers can have very different GWPs.
Enter the amount. Choose the matching mass unit. In rate mode, charge is per system and the rate is annual.
Review the basis. Check the factor source, converted leak mass, substituted calculation, and scope note before copying or downloading.

Formula and Assumptions

The central conversion is a mass-for-mass comparison:

CO₂e mass = refrigerant emitted mass × 100-year global warming potential (GWP100)

When leaked mass is not known, the calculator uses EPA's operating-emissions screening equation:

Estimated refrigerant emitted = full charge per system × number of systems × (annual leak rate ÷ 100) × years

This rate method assumes the full-charge basis and annual leak rate remain constant, including replenishment where needed. It estimates operating leakage only. EPA describes screening emission factors as highly uncertain and recommends material-balance methods when emissions are significant and inventory or service data are available.

Safety and reporting limit: Refrigerants may be pressurized, flammable, toxic, or capable of causing frostbite or oxygen displacement. This calculator does not diagnose a leak or provide repair instructions. Use qualified personnel and follow applicable safety, recovery, and reporting rules.

Worked Examples

5 lb R-410A service loss

5 lb × 0.45359237 = 2.26796 kg refrigerant.

2.26796 × 1,924 = 4,363.56 kg CO₂e = 4.36 t CO₂e.

25 kg R-404A system at 15% for 3 years

25 kg × 15% × 1 system × 3 years = 11.25 kg refrigerant.

11.25 × 3,943 = 44,358.75 kg CO₂e = 44.36 t CO₂e.

Included GWP100 Factor Basis

GWP is dimensionless: a factor of 1,924 means one unit of refrigerant mass has the modeled 100-year warming impact of 1,924 units of CO₂ mass. Different programs can require different values, so the selected factor and source are always shown in the result.

Group	Examples in this calculator	Basis
Pure HFCs and HFOs	R-32, R-134a, R-152a, R-227ea, R-245fa, R-1234yf, R-1234ze(E)	Current 40 CFR Part 98, Table A-1; values effective January 1, 2025
Common HFC blends	R-404A, R-407A, R-407C, R-410A, R-507A	EPA Greenhouse Gas Equivalencies Calculator AR5 factors
Other common references	R-22, R-448A, R-449A, R-290, R-744	EPA Technology Transitions, GreenChill, or IPCC AR4 program factors as labeled
Custom	Any documented refrigerant or reporting factor	User-entered GWP100

Methodology Review and Primary Sources

Methodology review: Starlight Tools checked the equations, unit conversions, included factors, worked examples, and edge-case handling against the sources below on August 3, 2026. No EPA affiliation or external professional certification is claimed.

U.S. EPA Center for Corporate Climate Leadership — Direct Fugitive Emissions guidance: operating screening equation, material-balance methods, and CO₂e conversion.
40 CFR Part 98, Table A-1: current chemical-specific GWP100 values used for the listed pure HFCs and HFOs.
EPA Greenhouse Gas Equivalencies Calculator revision history: AR5 factors for common HFC blends.
EPA Technology Transitions GWP reference table and EPA GreenChill refrigerant table: program factors for selected other refrigerants.

Frequently Asked Questions

How do I calculate CO₂e from a refrigerant leak?

Multiply the refrigerant mass released by its GWP100. Kilograms of refrigerant multiplied by GWP gives kilograms of CO₂e; divide by 1,000 for metric tonnes.

What if I know the charge and leak rate but not leaked mass?

Use charge + leak rate mode. It multiplies full charge per system by system count, annual rate, and years. The result is a screening estimate that assumes a constant full-charge basis and rate.

Is refrigerant added during servicing equal to refrigerant leaked?

EPA's simplified material-balance method treats refrigerant purchased to service equipment as replacing refrigerant emitted during operation. Installation, retirement, recovery, stock changes, and retrofits may require a fuller material balance.

Why do GWP values differ between sources?

Values change between IPCC assessment reports and regulatory programs. Blend values also depend on the component factors used. Follow the factor table required for your inventory and document the version.

Does charge mean the same thing as leaked mass?

No. Charge is the system's full refrigerant capacity. Leaked mass is the portion released. A 25 kg charge at a 10% annual rate represents an estimated 2.5 kg annual leak, not 25 kg.

How are blends handled?

The calculator uses a published factor for the exact named blend. Verify the ASHRAE refrigerant designation on the nameplate or service documentation.

Can I use this for mandatory reporting?

Use it for screening and transparent internal estimates. Formal reporting may specify another GWP table, inventory boundary, material-balance equation, rounding rule, or verification process. Select custom GWP when an official framework requires another factor.

Are my inputs uploaded?

No. Calculation, copy, and CSV export happen locally in your browser. The page does not send your refrigerant values to a server.