Home Carbonation PSI Chart:
Best Pressure for Every Beverage

Quick Reference: PSI Chart by Beverage

All values are at refrigerator temperature (38°F / 3°C). Warmer temperatures require higher PSI for the same carbonation level — see the temperature section below.

Understanding CO₂ Volumes: The Real Measurement

PSI is a means to an end. The actual measurement of carbonation is CO₂ volumes — the number of volumes of CO₂ gas dissolved into one volume of liquid at standard conditions.

One volume of CO₂ means that if you released all the dissolved gas from one liter of liquid, it would occupy one liter of space at atmospheric pressure. A typical commercial soda has about 3.5–4.0 volumes of CO₂. A mildly sparkling mineral water might have 2.0–2.5.

The relationship between CO₂ volumes, temperature, and PSI follows Henry's Law — a principle from physical chemistry stating that the amount of gas dissolved in a liquid is proportional to the partial pressure of that gas above the liquid. In practical terms: lower temperature = more CO₂ stays dissolved at any given pressure.

Why Temperature Changes Everything

This is the single most misunderstood aspect of home carbonation. Two people can use exactly the same PSI setting and get wildly different results — the difference is almost always temperature.

Temperature-Pressure Reference Table

This table shows the PSI required to achieve 2.5 volumes of CO₂ (standard sparkling water level) at different temperatures:

Detailed PSI Guide by Beverage Category

Sparkling Water

Sparkling water is the most common home carbonation project, and the PSI range is forgiving. Most commercial sparkling waters fall between 2.0 and 3.0 volumes of CO₂. San Pellegrino (one of the most recognizable styles) tests around 2.5–3.0 volumes. Topo Chico fans will want to push toward 3.5–4.0 volumes for that aggressive, tingly carbonation.

Practical range for water at 38°F: 10–18 PSI

Homebrewed Beer

Beer carbonation targets vary significantly by style. The BJCP (Beer Judge Certification Program) style guidelines specify acceptable CO₂ volumes for every beer style, which is a useful reference for homebrewers. Key rules of thumb:

• British real ales served from cask: 0.75–1.3 volumes (minimal carbonation)
• Most American ales: 2.2–2.6 volumes at 38°F = 10–13 PSI
• Lagers and pilsners: 2.4–2.6 volumes = 11–13 PSI
• Hefeweizens and highly carbonated styles: 3.3–4.5 volumes = 17–24 PSI

Homemade Soda

Commercial sodas are highly carbonated by design — that bite is part of the flavor profile, especially for colas and ginger ales. Targeting 3.5–4.5 volumes of CO₂ at 38°F requires 18–24 PSI. If your homemade soda feels flat compared to store-bought, you're almost certainly under the 3.5 volumes mark. Turn up the pressure and give it another 24 hours in the keg.

Kombucha

Kombucha is already naturally carbonated through fermentation, so force carbonation is usually used to top up carbonation rather than create it from scratch. Over-carbonating kombucha in sealed bottles is a genuine safety concern (bottle bombs), so if you're force-carbonating kombucha in a keg, keep it at the lower end: 1.5–2.5 volumes = 8–12 PSI. See our Kombucha Carbonation Guide for the full process.

Sparkling Wine and Cider

Traditional Champagne has 5–6 volumes of CO₂ — remarkably high, and under significant bottle pressure (around 90 PSI in the bottle). Home force-carbonated sparkling wine typically targets 4–5 volumes for a Champagne-like result, or 2.5–3.5 for a Prosecco/Pet Nat style. At 38°F, that's 22–30 PSI for a traditional sparkling wine profile.

Time-to-Carbonate Estimates

How long carbonation takes depends on your method. There are three main approaches:

Troubleshooting: Over and Under Carbonation

Too Flat (Under-Carbonated)

• Liquid wasn't cold enough before carbonating
• PSI was set too low for the target style
• Didn't wait long enough (especially with set & forget)
• CO₂ leak somewhere in the system (check connections with soapy water)
• Empty or near-empty CO₂ cylinder

Too Fizzy (Over-Carbonated)

• PSI set too high for the style
• Left under pressure too long at higher temperature
• Liquid was warmer than assumed when setting PSI
• Fix: vent the keg slowly by depressing the pressure relief valve in short bursts until pressure reads correctly, then let sit 24 hours before sampling