Convert R-717 (Ammonia) to CO2e
Ammonia — refrigerant designation R-717, chemical formula NH3 — is the odd one out among refrigerants: its direct global warming potential is zero. It is a natural refrigerant with no assigned GWP, so however many kilograms leak, the direct CO2-equivalent is 0. That is precisely why ammonia has run industrial refrigeration for over a century and is now a leading climate-friendly alternative to high-GWP HFCs. The converter above confirms the zero; this page explains what it does — and does not — mean.
Ammonia (R-717) has a global warming potential of 0, so converting it to CO2e gives 0: any mass × 0 = 0 kg CO2e of direct emissions. Unlike the fluorinated refrigerants, an ammonia leak carries no direct climate cost — though the energy used to run the system still does (see below).
The IPCC does not assign ammonia a 100-year GWP, and refrigerant standards treat it as 0. Ammonia is a reactive gas that washes out of the atmosphere in days and is not a long-lived, well-mixed greenhouse gas, so it exerts no direct radiative forcing to count. This is a fixed, definitional zero — which is why this converter is a simple ×0 rather than a live MasterBrain value, and why it runs one way only: no finite mass of ammonia corresponds to a non-zero CO2e figure to reverse.
How to convert R-717 to CO2e
Carbon-dioxide-equivalent multiplies a gas’s mass by its global warming potential. For ammonia the GWP is 0, so the direct CO2e is always 0, regardless of the mass involved.
kg CO2e = kg R-717 × 0 = 0
What an ammonia leak costs vs the refrigerants it replaces
A table of ammonia conversions would be all zeros — so the useful comparison is the direct CO2e of the same leak in ammonia versus the fluorinated refrigerants it displaces. Take a 50 kg loss from an industrial system, at AR6 GWP-100:
| Refrigerant (50 kg leak) | GWP-100 (AR6) | Direct CO2e |
|---|---|---|
| R-717 (ammonia) | 0 | 0 kg |
| R-134a | 1,530 | 76,500 kg |
| R-410A | 2,256 | 112,800 kg |
| R-404A | 4,728 | 236,400 kg |
The same physical leak that is over 200 tonnes CO2e on R-404A is nothing, directly, on ammonia. Eliminating the fluorinated charge removes the direct-emission risk entirely — the core reason ammonia and other non-fluorinated naturals are displacing HFCs in industrial refrigeration.
Why ammonia’s GWP is zero
A greenhouse gas earns a GWP by being both radiatively active and long-lived enough to accumulate in the atmosphere. Ammonia is neither in the relevant sense: it is highly reactive and is removed from the air within days (mainly by forming ammonium salts), so it never builds up as a well-mixed greenhouse gas. It has real environmental effects — as an air-quality pollutant and aerosol precursor — but no direct 100-year warming potential, which is what a CO2e conversion measures. Its ozone-depletion potential is likewise zero.
Zero direct GWP is not zero climate impact
With no direct emissions, an ammonia system’s entire climate footprint is indirect — the CO2e of the electricity or fuel that runs it. The good news is that ammonia is thermodynamically excellent and often more efficient than HFC systems, so its total (direct + indirect) warming impact is typically lower too. A converter can only give you the direct zero; the full picture needs the system’s energy use and grid factor.
Ammonia’s climate advantage comes with a safety trade-off. It is toxic and mildly flammable (safety class B2L), with a sharp odour at low concentrations. Ammonia systems require gas detection, ventilation, machinery-room controls and trained staff under refrigeration-safety standards. Its zero GWP does not make it hazard-free — it shifts the challenge from climate to safety engineering.
Where ammonia is used
- Industrial and cold-chain refrigeration — cold stores, food and beverage processing, breweries and abattoirs, where ammonia has been the workhorse for over a century.
- Ice rinks and district cooling — large systems where efficiency and zero direct GWP outweigh the safety overhead.
- Scope 1 fugitive emissions — an ammonia charge is reported at 0 direct CO2e in the corporate inventory, unlike a fluorinated charge; the system’s energy is a Scope 2 or Scope 1 (fuel) line instead.
- HFC replacement — a leading natural refrigerant, alongside CO2 (R-744) and hydrocarbons, in the move away from high-GWP HFCs.
Building a refrigerant inventory that mixes ammonia with fluorinated gases, and want the leak emissions and data-quality handled across many systems?
Frequently Asked Questions
You multiply the mass by the global warming potential — but ammonia’s GWP is 0, so the direct CO2e is always 0. Any mass of ammonia converts to 0 kg CO2e of direct emissions.
Zero. The IPCC assigns ammonia no 100-year global warming potential, and refrigerant standards list R-717 as GWP 0. Its ozone-depletion potential is also zero. It is one of the few refrigerants with no direct climate cost at all.
Because it is not a long-lived, well-mixed greenhouse gas. Ammonia is highly reactive and washes out of the atmosphere within days, so it never accumulates to exert direct radiative forcing. It has other environmental effects (as an air pollutant and aerosol precursor), but no 100-year warming potential, which is what CO2e measures.
No — it means no direct impact. An ammonia system still causes emissions through the energy it consumes. But ammonia is highly efficient, often more so than HFC systems, so its total direct-plus-indirect footprint is usually lower. The direct zero is real; the full picture depends on the system’s energy use.
Because the GWP is 0, every mass of ammonia maps to 0 kg CO2e, so there is no way to work backwards from a CO2e figure to a mass — any mass would fit. The conversion runs one way only: ammonia to a direct CO2e of zero.
Because it is toxic and mildly flammable (safety class B2L). Ammonia systems need gas detection, ventilation, machinery-room controls and trained personnel, which suits large industrial installations more than small commercial or domestic ones. Its zero GWP trades a climate problem for a safety-engineering one.
Mainly in large industrial refrigeration — cold storage, food and beverage processing, breweries, ice rinks and district cooling. It is a leading natural-refrigerant alternative to high-GWP HFCs, used alongside CO2 (R-744) and hydrocarbons.