What happens if I set the keg PSI too high?

You'll overcarbonate the beer, leading to excessive foam and gushing pours, and it risks pushing pressure beyond your keg or fitting's rated limit if left unchecked.

Do I need to adjust keg carbonation for altitude?

Yes, if at meaningful elevation. Most carbonation charts and formulas assume sea-level atmospheric pressure. Add approximately 0.5 PSI per 1,000 feet of elevation to compensate.

Can I use a keg carbonation calculator for cider or mead?

Yes, the underlying CO2 solubility relationship is the same regardless of beverage type. Choose a target carbonation level appropriate for cider or sparkling mead, typically 2.0 to 3.5 volumes.

ABV Calculator Keg Carbonation Calculator: Force Carbonation PSI Chart

Keg Carbonation Calculator

Q: What PSI should I set my keg at for 2.5 volumes of CO2?

At a typical kegerator temperature of 38F, roughly 11-12 PSI targets 2.5 volumes of CO2. The exact figure shifts with temperature, since warmer kegs need higher pressure for the same carbonation level.

Q: Does keg temperature really matter for carbonation?

Yes, temperature is one of the two main variables along with pressure. Colder liquid holds more dissolved CO2 at a given pressure than warmer liquid, so a keg at 38F reaches a target carbonation level at meaningfully lower PSI than the same beer at 50F.

Q: Is a keg carbonation calculator the same as a keg priming calculator?

No. A keg carbonation calculator works out the regulator PSI for force carbonation with a CO2 tank, while a keg priming calculator works out how much sugar to add for natural, bottle-style carbonation inside a sealed keg without external CO2 pressure.

Updated – 2026

Force Carbonation PSI Calculator

This beer keg carbonation calculator works both directions: enter your keg temperature and either your target CO₂ volumes or your regulator PSI, and whichever field you edit, the other updates instantly. Use it to find the right force-carbonation pressure setting for a target carbonation level, or to check what carbonation you’ll end up with at a PSI you’ve already set. Prefer to look values up instead? Jump to the full keg carbonation chart below, in both °F/PSI and °C/PSI.

Keg temperature

Unit

Beer style (optional — auto-fills target)

Target CO₂ (volumes) vol

Regulator pressure psi

Regulator setting

—

PSI at sea level

Resulting carbonation

—

Volumes of CO₂

Enter a temperature and either a target volume or a PSI to see a result.

Bottling instead of kegging? Use the Priming Sugar Calculator — it uses the same residual-CO₂ logic but works out a sugar weight for bottle conditioning instead of a regulator PSI.

How to Use This Keg Carbonation Calculator

Enter your keg’s actual temperature — the temperature inside your kegerator or fridge, not room temperature. This is the single biggest factor in the calculation.
Enter a target CO₂ level — pick a style from the dropdown for a sensible starting point, or type your own volumes directly.
Read off the recommended PSI in the results panel — this is the regulator setting to dial in at your tank.
Or work it the other way: if you already have a PSI set and want to know what carbonation level you’ll land at, type the PSI into the Regulator Pressure field instead and the Target CO₂ field will update to show the result.

How Long Does It Take to Carbonate a Keg?

How long it takes to carbonate beer in a keg depends on which method you use:

Set-and-forget method (recommended): set the regulator to the PSI shown above and leave the keg connected at that pressure. This typically takes 1–2 weeks to fully equilibrate, since CO₂ needs time to dissolve evenly through the liquid.
Shake / rock method (fast): connect gas at a higher pressure (often 25–30 PSI) and rock or shake the keg for several minutes, then bleed back to serving pressure. This can carbonate a keg in as little as 24–48 hours, but it’s easier to overshoot your target, so check carbonation periodically rather than assuming it’s done.

Understanding Your Results

Why Temperature and Pressure Are Linked

CO₂ dissolves into liquid according to Henry’s Law — colder liquid can hold more dissolved gas at a given pressure than warmer liquid can. That’s why a kegerator running at 38°F needs noticeably less pressure to reach 2.5 volumes of CO₂ than the same beer would need at, say, 50°F.

PSI ≈ −16.6999 − 0.0101059·T + 0.00116512·T² + 0.173354·T·V + 4.24267·V − 0.0684226·V² where T = temperature in °F, V = target volumes of CO₂

Source: This is a standard regression fit to published CO₂ solubility-in-beer data, of the kind used across most force-carbonation calculators and reference charts in homebrewing literature — consistent with the temperature/pressure relationship described in the Brewers Association’s technical guide to draught beer carbonation. As with any such regression, treat the result as a close estimate rather than a lab-exact figure — always cross-check against your own taste and, if available, a printed reference chart.

Altitude Adjustment

This calculator, like most published carbonation charts, assumes sea-level atmospheric pressure. If you’re brewing at meaningful altitude, add approximately 0.5 PSI per 1,000 feet of elevation above sea level to the result to account for the lower ambient atmospheric pressure.

Carbonation Targets by Style

These are typical starting ranges — you can always enter your own target directly in the calculator above.

Typical carbonation ranges in volumes of CO₂ by beverage style.
Style	Typical CO₂ (volumes)	Character
British ales, bitters, milds	1.5 – 2.0	Low carbonation, soft mouthfeel
Porters, stouts	1.7 – 2.3	Gentle carbonation, creamy body
American ales, pale ales, IPAs	2.2 – 2.7	Moderate, lively carbonation
Lagers, pilsners	2.2 – 2.7	Crisp, refreshing carbonation
Belgian ales, tripels, dubbels	2.5 – 3.5	High, champagne-like effervescence
German wheat beers	3.3 – 4.5	Very high, foamy carbonation
Hard cider	2.5 – 3.5	Crisp to sparkling, style-dependent
Sparkling mead	2.0 – 2.8	Light effervescence

Keg Carbonation Chart: PSI by Temperature

This keg carbonation chart shows the regulator PSI needed to reach a target CO₂ level at a given keg temperature, generated from the same formula as the calculator above. Use the toggle to switch between a Fahrenheit and a Celsius (metric) keg carbonation chart. On a phone, scroll the table sideways to see all columns.

Keg carbonation chart in PSI by temperature (°F) and CO₂ volumes.
Temp (°F)	1.5 vol	2.0 vol	2.25 vol	2.5 vol	2.75 vol	3.0 vol	3.5 vol
32°F	~0	3.5	5.9	8.2	10.6	12.9	17.6
34°F	~0	4.3	6.8	9.2	11.7	14.1	18.9
36°F	0.0	5.1	7.7	10.2	12.8	15.3	20.3
38°F	0.7	6.0	8.6	11.2	13.9	16.5	21.7
40°F	1.4	6.8	9.6	12.3	15.0	17.7	23.0
42°F	2.1	7.7	10.5	13.3	16.1	18.9	24.4
44°F	2.8	8.6	11.5	14.4	17.2	20.1	25.8
46°F	3.5	9.5	12.4	15.4	18.4	21.3	27.2
48°F	4.2	10.4	13.4	16.5	19.5	22.6	28.6
50°F	4.9	11.3	14.4	17.6	20.7	23.8	30.1

Keg carbonation chart in PSI by temperature (°C, metric) and CO₂ volumes.
Temp (°C)	1.5 vol	2.0 vol	2.25 vol	2.5 vol	2.75 vol	3.0 vol	3.5 vol
0°C	~0	3.5	5.9	8.2	10.6	12.9	17.6
2°C	~0	5.0	7.5	10.0	12.5	15.0	20.0
4°C	1.1	6.5	9.2	11.9	14.5	17.2	22.5
6°C	2.3	8.1	10.9	13.7	16.6	19.4	25.0
8°C	3.6	9.6	12.6	15.6	18.6	21.6	27.5
10°C	4.9	11.3	14.4	17.6	20.7	23.8	30.1

Values shown as “~0” mean the target level is reached at or below atmospheric pressure through chilling alone. All figures assume sea level — add roughly 0.5 PSI per 1,000 ft of elevation at altitude. For a value between rows or columns, use the live calculator above instead of interpolating by eye.

Force Carbonation Safety

CO₂ tanks and kegs hold real pressure, and a few basic precautions matter:

Check your keg’s pressure rating before setting a high PSI — most Cornelius (ball-lock/pin-lock) kegs are rated well above typical serving pressures, but always confirm rather than assume.
Test relief valves periodically to make sure they vent correctly if pressure builds beyond a safe level.
Don’t exceed your regulator or gas line’s rated pressure when using the “shake to carbonate” fast method at elevated PSI.
Secure CO₂ tanks upright and away from heat sources — a punctured or overheated tank can fail dangerously.
Bleed pressure before disconnecting fittings to avoid a sudden release of gas or liquid.

Frequently Asked Questions About Keg Carbonation

What PSI should I set my keg at for 2.5 volumes of CO₂?

At a typical kegerator temperature of 38°F, roughly 11–12 PSI targets 2.5 volumes of CO₂. The exact figure shifts with temperature — warmer kegs need higher pressure for the same carbonation level. Use the calculator above for a figure specific to your setup.

How long does it take to force carbonate a keg?

Set-and-forget carbonation at serving pressure typically takes 1–2 weeks to fully equilibrate. Shaking or rocking the keg at a higher pressure can carbonate beer in as little as 24–48 hours, though this method is easier to overshoot.

Does keg temperature really matter for carbonation?

Yes — temperature is one of the two main variables, along with pressure. Colder liquid holds more dissolved CO₂ at a given pressure than warmer liquid, so a keg at 38°F reaches a target carbonation level at meaningfully lower PSI than the same beer at 50°F.

What happens if I set the PSI too high?

You’ll overcarbonate the beer, leading to excessive foam and gushing pours. It also risks pushing pressure beyond your keg or fitting’s rated limit if left unchecked for a long period. If you overshoot, disconnect the gas and vent some pressure, then let the keg rest before re-checking.

Do I need to adjust for altitude?

Yes, if you’re at meaningful elevation. Most carbonation charts and formulas — including this one — assume sea-level atmospheric pressure. Add approximately 0.5 PSI per 1,000 feet of elevation to compensate for the lower ambient pressure at altitude.

Can I use this calculator for cider or mead instead of beer?

Yes — the underlying CO₂ solubility relationship is the same regardless of the beverage. Just choose a target carbonation level appropriate for cider or sparkling mead (typically 2.0–3.5 volumes) rather than a beer style.

What is a keg carbonation chart and how do I read one?

A keg carbonation chart lists the regulator PSI needed for different keg temperatures and CO₂ volume targets, usually as a grid with temperature down one side and volumes across the top. Find your keg’s temperature row, then the column matching your target carbonation, and read off the PSI. See the full chart above in both °F and °C — or use the calculator for a figure between rows.

Is a keg carbonation calculator the same as a keg priming calculator?

Not quite — they solve different problems. A keg carbonation calculator (this tool) works out the regulator PSI for force carbonation with a CO₂ tank. A keg priming calculator or priming sugar calculator instead works out how much sugar to add for natural, bottle-style carbonation inside a sealed keg without external CO₂ pressure. If you’re priming rather than force carbonating, use the Priming Sugar Calculator instead.