Free Compliance Tools
Refrigerant Leak Rate Calculator
Free · Any refrigerant · Both EPA methods · Nothing stored
When refrigerant is added to a covered appliance, the owner or operator has to calculate its leak rate — 40 CFR § 84.106(b) names three exceptions, below — and compare it to the appliance's rate: 10, 20 or 30 percent depending on what the appliance is used for. Pick the refrigerant, enter the full charge and each addition, and this calculator runs the EPA's annualizing or rolling average method on your numbers — the same engine that opens a repair action inside Ref LeakLog. HFCs and other covered refrigerants are calculated under 40 CFR Part 84, Subpart C; R-22 under the Section 608 rule at 40 CFR § 82.157.
Calculate a Leak Rate
Equipment Setup
Typical range: 5–25 lbs (residential), 15–80 lbs (light commercial)
Log Refrigerant Addition
Annualizing Method
rate = (lbs_added ÷ full_charge) × (365 ÷ D) × 100
Where D = days since the previous addition, capped at 365 (365 for the first event after Jan 1, 2026). Projects a single addition over a full year.
R-410A leak rate (annualizing)
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ADD R-410A SERVICE EVENTS TO CALCULATE
Comfort Cooling · 10% EPA threshold
0.0 lbs
0%
of 125% threshold
0
R-410A Service Events
No service events yet.
Enter an R-410A addition above to see your EPA-compliant leak rate calculation in real time.
Track R-410A Compliance Automatically
Stop calculating by hand. Ref LeakLog automates R-410A leak rate tracking, repair workflows, audit-ready reports, and team management for the 2026 mandate.
Start Your 14-Day Free TrialThe Leak Rate Formula — Both EPA Methods
Annualizing method
leak rate = (lbs added ÷ full charge) ÷ (D ÷ 365) × 100
Take the pounds added to return the appliance to full charge and divide by the full charge. D is the number of days since the last day refrigerant was added, capped at 365. The first calculation after January 1, 2026 uses 365 (§ 84.106(b)(1)). It projects the current loss over twelve months, so a large addition soon after the last one reads high.
Rolling average method
leak rate = (lbs added in the last 365 days ÷ full charge) × 100
Add up every pound put into the appliance over the previous 365 days — or since the last successful follow-up verification test showing all identified leaks were repaired, if that is less than a year — and divide by the full charge. The first calculation after January 1, 2026 counts the pounds added since that date (§ 84.106(b)(2)).
Both methods are the § 84.102 definition of “leak rate”, which also requires the same method for every appliance subject to the leak repair requirements at an operating facility. Additions made immediately after a retrofit or a new installation, or that qualify as a seasonal variance, do not need a calculation (§ 84.106(b)). For the method behind the numbers, with three more worked examples, read the leak rate field guide.
Worked Example: Where the Two Methods Disagree
A walk-in freezer in a supermarket holds 40 lbs of refrigerant. Supermarket appliances are retail food under § 84.102, so this one is commercial refrigeration and its rate is 20 percent (§ 84.106(c)(2)(i)). It took 3 lbs on March 2, 2026 and 4 lbs on June 30, 2026, 120 days later.
Facility on the annualizing method
(4 ÷ 40) ÷ (120 ÷ 365) × 100
30.42%
Over the 20 percent rate — the 30-day repair clock starts on June 30, 2026.
Facility on the rolling average method
(3 + 4) ÷ 40 × 100
17.50%
Under the 20 percent rate — no repair is triggered by this addition.
Same freezer, same pounds, opposite answers — and the result cannot pick the method: it is fixed per facility. The first addition reads 7.50 percent under either method, because the first calculation after January 1, 2026 uses 365 days or the pounds added since that date. Enter these numbers above to check them.
Leak Rates by Appliance Category
| Appliance category | Leak rate |
|---|---|
| Comfort Cooling | 10% |
| Commercial Refrigeration | 20% |
| Industrial Process | 30% |
| Transport Refrigeration | 10% |
40 CFR § 84.106(c)(2) and (d). The rule's trigger is a leak rate over the applicable rate; the calculator flags a result that lands exactly on it too, the conservative side of the line. Not sure which category an appliance is in? Read how § 84.102 sorts comfort cooling, commercial and industrial process appliances.
Calculators by Refrigerant
Each page runs the same calculator with its refrigerant's GWP, safety class, typical charges and regulatory status beside it.
R-404A leak rate calculator
GWP 3,922
R-410A leak rate calculator
GWP 2,088
R-22 leak rate calculator
GWP 1,810 · 40 CFR § 82.157
R-407C leak rate calculator
GWP 1,774
R-134a leak rate calculator
GWP 1,430
R-449A leak rate calculator
GWP 1,396
R-448A leak rate calculator
GWP 1,386
R-32 leak rate calculator
GWP 675
R-454B leak rate calculator
GWP 465
Rate over the line already? Project every repair and verification-test date.
Frequently Asked Questions
Does the refrigerant change the leak rate threshold?
No. The rate an appliance is judged against comes from what the appliance is used for, not what is in it: 20 percent for commercial refrigeration, 30 percent for industrial process refrigeration, and 10 percent for comfort cooling, refrigerated transport and other appliances with a full charge of 15 pounds or more (40 CFR § 84.106(c)(2)). The refrigerant decides whether the rule applies at all — § 84.106 covers appliances with a full charge of 15 pounds or more whose refrigerant contains a regulated HFC, or a substitute with a GWP above 53 (§ 84.106(a)); appliances used for residential and light commercial air conditioning and heat pumps are excluded ((a)(3)(ii)); and an appliance charged solely with an ozone-depleting refrigerant such as R-22 falls under 40 CFR § 82.157 instead, which applies at 50 pounds or more and uses the same three rates.
Which method should I use, annualizing or rolling average?
Either is allowed — both are written into the § 84.102 definition of leak rate — but the same method must be used for every appliance subject to the leak repair requirements at an operating facility. Switching later is allowed only under § 84.106(b)(3): when the owner or operator acquires a facility that was using a different method from its other facilities, and only if the appliances whose method would change are not over their leak rate under either method, with a record of the change. So the choice is made once per facility, not per service call. Annualizing reacts to a recent large addition; the rolling average adds up everything in the last 365 days (or since the last successful follow-up verification test, if that period is shorter).
What does "full charge" mean in the formula?
The amount of refrigerant the appliance needs for normal operating characteristics and conditions — the denominator of both methods. § 84.102 allows four ways to determine it: the manufacturer's determination, a calculation from component sizes, piping volume and refrigerant density, actual measurements of refrigerant added or evacuated, or an established range whose midpoint serves as the full charge. A wrong full charge moves every leak rate the appliance will ever have, which is why the full charge and the method used to determine it are part of the appliance record (§ 84.106(l)(1)(iii)).
What happens when the leak rate is over the threshold?
The owner or operator must identify and repair the leaks within 30 days of the addition that put the appliance over its rate — 120 days if an industrial process shutdown is required (§ 84.106(d)) — or elect to retrofit or retire the appliance under a plan (§ 84.106(c)(1), (h)). The repair is documented by an initial and a follow-up verification test (§ 84.106(e)). The repair deadline calculator lays out every one of those dates from the day of the addition.
More on the denominator: what “full charge” means and how to record it. On the clock that starts at the threshold: the repair workflow, step by step.
Every Addition, Calculated As It Is Logged
In Ref LeakLog a tech logs the pounds and the leak rate is calculated on the spot, with the method you chose, against the appliance's own rate — and an addition that puts it over opens the repair action with its deadline attached.
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Ref LeakLog is an independent product and is not affiliated with, approved by, or endorsed by the U.S. Environmental Protection Agency. The calculations follow 40 CFR Part 84, Subpart C and 40 CFR § 82.157 as published at ecfr.gov (issue date September 3, 2026); the regulation controls, not the calculator.