Keg Carbonation Calculator (Set-and-Forget PSI + Line Length)
Free keg carbonation calculator: enter beer temp and CO2 volumes to get regulator PSI — 2.5 vols at 38°F = 11.2 psi — plus balanced beer line length.
Set the regulator once, wait, and pour — that’s the promise of force carbonation, but only if the PSI matches your beer’s temperature and target carbonation level. This keg carbonation calculator does the matching for you: enter your kegerator temperature in °F, pick a style preset (American ales run 2.2–2.8 volumes of CO2, lagers 2.4–2.6, British ales 1.5–2.0, wheat beers 3.3–4.5), and it returns the exact set-and-forget regulator pressure from the standard force-carbonation formula. At 38°F and 2.5 volumes, that’s 11.2 psi. It also suggests a 3/16-inch beer-line length so the same pressure that carbonates your keg pours a clean pint instead of a glass of foam. Expect full carbonation in 5–14 days at serving pressure, or use the burst method covered below to be pouring in about 5 days.
What PSI should I carbonate my keg at?
Set 11.2 psi for beer at 38°F targeting 2.5 volumes of CO2 — the standard for American ales and the most common homebrew setting. Most styles at typical kegerator temperatures of 36–40°F land between 8 and 14 psi. The exact number shifts about 0.5 psi per °F, so enter your actual beer temperature and style in the calculator above rather than copying someone else’s setting.
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Keg Carbonation Calculator
Key Information
| Parameter | Details |
|---|---|
| Regulator PSI for 2.5 vols at 38°F | 11.2 psi |
| Set-and-forget carbonation time | 5–14 days |
| 3/16″ beer-line resistance | ≈2.2–3 psi per foot |
| Corny keg maximum pressure rating | 130 psi |
Frequently Asked Questions
What PSI should I carbonate my keg at?
Set 11.2 psi for beer at 38°F targeting 2.5 volumes of CO2 — the standard for American ales and the most common homebrew setting. Most styles at typical kegerator temperatures of 36–40°F land between 8 and 14 psi. The exact number shifts about 0.5 psi per °F, so enter your actual beer temperature and style in the calculator above rather than copying someone else’s setting.
How long does it take to force carbonate a keg?
5 to 14 days at serving pressure, with most kegs fully carbonated around day 10 at 38°F. Burst carbonation shortens this: 30 psi for 24–36 hours gets the beer roughly 75% of the way there, then 3–4 more days at serving pressure finish it — about 5 days total. Shake methods can carbonate in under an hour but risk overshooting, which takes 24–48 hours of venting to undo.
Why does my keg pour foamy at the right PSI?
Your beer line is almost certainly too short. Stock kegerator kits ship with 5 feet of 3/16-inch line, which under-restricts most systems; swapping to 8–10 feet fixes the majority of foamy pours without touching the regulator. Other causes: beer warming in the tap tower (first pour foams, second doesn’t), a kinked line, or leftover burst-carbonation pressure that was never dropped back to serving level.
Are these calculators free to use?
Yes, all calculators on CalcCorp are completely free — no registration, no login, no hidden charges. Results are calculated instantly in your browser and we do not store any of your data.
How accurate are these calculations?
Our calculators use standard financial formulas updated with the latest tax rates, interest rates, and government policies for 2026. Results are accurate for planning purposes but should be verified with a professional for final decisions.
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Last updated: March 2026