Calculator
To calculate refrigerant leak rate, enter the appliance's full charge, the pounds added, and the days since the last addition. The result estimates how much of the full charge was lost over that period, annualized for comparison.
Annualizing method
The calculator uses an annualized method based on the amount added, the full charge, and the time since the last addition. If you want the exact formula used in the regulation, check the EPA text and compare it with your own records before relying on the result. For related recordkeeping context, see our EPA 608 recordkeeping guide and the glossary.
Compare with the repair threshold
After you calculate the leak rate, compare it with the repair threshold for your appliance type. Thresholds can vary by equipment category, so use the correct rule for the system you are checking. Our refrigerant leak repair thresholds guide can help you review the categories and terminology.
Limits of this tool
This tool is a calculation aid, not a compliance determination. Your records, appliance details, and the applicable rule are your responsibility, so always confirm the final result against the source text and your own documentation.
Log it automatically
If you want to track leak events over time, keep your readings and additions in one place. HVAC Refrigerant Log is building tools for organized tracking, including a leak rate tracking workflow and a waitlist for the app through get the app. You can also return to the home page for more tools and guides.
Reference only. Verify with manufacturer data and gauges. Follow the manufacturer chart and EPA rules. This site is not an approval from EPA.