How the Carbon Dioxide Converter Works
The Carbon Dioxide Converter divides CO₂ mass by the density of the phase you have. The default 0.001842 kg/L (1.842 kg/m³) fits CO₂ gas at 20°C (68°F) and 1 atm.
Identify the phase
CO₂ exists as gas, pressurized liquid, solid dry ice or supercritical fluid.
Pick the density
Read the density for your phase in the table.
Enter the mass
Type the CO₂ mass in kilograms.
Read the volume
Gas results come out large; divide by 1,000 for m³.
Carbon Dioxide Converter Formula
The CO₂ formula is V = m ÷ ρphase. One kilogram of CO₂ gas fills about 543 L at 20°C and 1 atm.
- ρphase
- CO₂ density for the phase, kg/L
Worked Examples
- Soda maker cylinder (425 g): 0.425 ÷ 0.001842 = 231 L of gas.
- Dry ice block: 10 kg ÷ 1.56 = 6.41 L.
- Beverage cylinder (liquid at 20°C): 6 kg ÷ 0.773 = 7.76 L of liquid.
Carbon Dioxide Converter Conversion Table
1 kg of CO₂ gas fills 543 liters at 20°C, while 1 kg of dry ice fills 0.641 liters. The table lists 7 CO₂ states.
| CO₂ State | Conditions | Density (kg/L) | Liters per 1 kg | Gas Expansion Ratio |
|---|---|---|---|---|
| Gas | 0°C, 1 atm | 0.001977 | 505.82 | 1 |
| Gas | 20°C, 1 atm | 0.001842 | 542.89 | 1 |
| Liquid | −20°C, 19.7 bar | 1.032 | 0.969 | 560× |
| Liquid | 0°C, 34.9 bar | 0.928 | 1.078 | 504× |
| Liquid | 20°C, 57.3 bar | 0.773 | 1.294 | 420× |
| Supercritical | 35°C, 100 bar | 0.713 | 1.403 | 387× |
| Solid (dry ice) | −78.5°C, 1 atm | 1.560 | 0.641 | 847× |
What is a Carbon Dioxide Converter?
A Carbon Dioxide Converter is a calculator that converts CO₂ mass into volume for the gas, liquid, solid or supercritical state.
Carbon dioxide gas is 1.52 times denser than air, so CO₂ settles in cellars, pits and tank bottoms. Concentrations above 5% by volume cause headaches and confusion.
CO₂ has no liquid phase at 1 atm. Solid dry ice sublimates straight into gas at −78.5°C (−109.3°F), and liquid CO₂ needs at least 5.18 bar.
What are the Uses of a Carbon Dioxide Converter?
There are 5 main uses of a Carbon Dioxide Converter.
Beverage carbonation
Bars convert cylinder kg into kegs carbonated.
Dry ice shipping
Couriers convert dry ice kg into box volume and gas release.
Greenhouse enrichment
Growers convert CO₂ dosing into ppm targets.
Fire suppression
Engineers size CO₂ systems by room volume.
Carbon accounting
Analysts picture tonnes of CO₂ as gas volume.