Refrigerant GWP Calculator
Look up refrigerant GWP values and calculate the GWP reduction or increase when comparing one refrigerant with another.
From GWP lookup to reduction percentage
Use one consistent refrigerant reference set for quick climate-metric screening before moving to equipment, safety and regulatory checks.
Compare current and alternative refrigerant GWP
Choose a baseline refrigerant and an alternative. The calculator shows the absolute difference, percentage change and screening threshold.
Build your GWP comparison
Default: R410A → R454B. Share a selected pair with ?from=r410a&to=r454b.
R410A → R454B
Where do the selected GWP values sit?
These threshold buckets are screening aids only. Regulatory limits depend on jurisdiction, sector, equipment category and compliance date.
GWP 2,088 falls above the 750 screening threshold.
GWP 465 falls within the ≤700 screening bucket.
Look up one refrigerant GWP
Use this view when you only need a fast GWP, ODP, safety-class and refrigerant-family check.
Common refrigerant GWP examples
These values remain visible in the page content even without JavaScript and use the same primary reference basis as the calculator.
| Refrigerant | GWP | Safety Class | Screening Bucket |
|---|---|---|---|
| R404A | 3,922 | A1 | >750 |
| R410A | 2,088 | A1 | >750 |
| R134a | 1,430 | A1 | >750 |
| R32 | 675 | A2L | ≤700 |
| R513A | 630 | A1 | ≤700 |
| R454B | 465 | A2L | ≤700 |
| R454C | 146 | A2L | ≤150 |
| R455A | 146 | A2L | ≤150 |
| R290 | 3.3 | A3 | ≤150 |
| R744 | 1 | A1 | ≤150 |
| R1234yf | 1 | A2L | ≤150 |
What does refrigerant GWP mean?
GWP is useful for comparing direct climate impact, but it is only one part of refrigerant and system selection.
Global Warming Potential
Global Warming Potential compares the warming impact of a greenhouse gas with CO₂ over a defined time horizon. CO₂ is assigned GWP 1.
To calculate emissions from an actual refrigerant charge or leakage mass, use the CO₂e calculator.
Open CO₂e Calculator →Why can GWP values differ?
Different regulations can reference different IPCC or WMO assessment reports. Scientific updates to atmospheric lifetime, radiative efficiency and rounding can therefore produce different published values.
Refrigerants.net uses the EPA Technology Transitions reference table as the primary site-wide GWP basis where available.
Compare More Refrigerant Properties →Refrigerant GWP calculator questions
Short answers to common GWP, low-GWP and CO₂e questions.
What is refrigerant GWP?
GWP compares a gas's warming impact with CO₂ over a defined time horizon. CO₂ is GWP 1; higher values indicate greater direct warming impact per unit mass.
How is GWP reduction calculated?
Subtract the alternative GWP from the baseline GWP, divide by the baseline, then multiply by 100. The calculator also handles increases and equal values.
What refrigerants have GWP below 700?
Examples in this tool include R32, R454B, R450A, R513A, R515B and several lower-GWP HFO/HFC blends. A sub-700 value does not by itself establish legal approval.
What refrigerants have GWP below 150?
Examples include R454C, R455A, R471A, R516A, R290, R600a, R717, R744, R1234yf and R1234ze(E). Safety and application rules remain separate.
What is the GWP of R410A?
R410A is GWP 2,088 on the EPA Technology Transitions reference basis used by this site.
What is the GWP of R32?
R32 is GWP 675 on the EPA Technology Transitions reference basis used by this site.
What is the GWP of R454B?
R454B is GWP 465 on the EPA Technology Transitions reference basis used by this site.
Why does R1234yf sometimes show GWP 1 and sometimes 4?
Different reference assessments are being used. EPA Technology Transitions currently uses 1, while some older EPA SNAP resources still display 4.
Does lower GWP mean a refrigerant can directly replace another?
No. Retrofit compatibility depends on the exact equipment, pressure architecture, lubricant, safety class, controls, manufacturer approval and applicable regulation.
What is the difference between GWP and CO₂e?
GWP is a relative warming factor; CO₂e applies that factor to an actual gas mass. Use the CO₂e Calculator when you know the refrigerant quantity.
Need help evaluating a low-GWP transition?
Use the comparison tool for broader technical differences, the Finder for application screening, or discuss refrigerant selection and project requirements.