Mixing ratio to grams per cubic meter
Type a value in g/kg to get it in g/m³ instantly.
60g/m³
That's 2.4× as humid as tropical air — nothing on our list beats it. A 50 m³ room at that level holds about 3,000 mL of water.
Convert the other way: g/m³ to g/kg
What it means
How much water is in the air?
Saturation values come from the Magnus formula, accurate to about 0.1% between −40 and 50 °C.
The math
How to convert g/kg to g/m³
Relative humidity is a percentage of saturation, and saturation depends steeply on temperature: g/m³ = RH% × saturation(T) ÷ 100. The figures below use the temperature selected above.
Example: 50 g/kg = 60 g/m³.
The table below is for air at 0 °C, freezing.
Every unit
Your humidity in every unit
Tables
g/kg to g/m³ conversion table
| g/kg | g/m³ |
|---|---|
| 1 g/kg | 1.2 g/m³ |
| 2 g/kg | 2.4 g/m³ |
| 5 g/kg | 6 g/m³ |
| 8 g/kg | 9.6 g/m³ |
| 10 g/kg | 12 g/m³ |
| 15 g/kg | 18 g/m³ |
| 17 g/kg | 20.4 g/m³ |
| 20 g/kg | 24 g/m³ |
| 25 g/kg | 30 g/m³ |
| 30 g/kg | 36 g/m³ |
| 50 g/kg | 60 g/m³ |
g/m³ to g/kg conversion table
| g/m³ | g/kg |
|---|---|
| 1 g/m³ | 0.833333 g/kg |
| 2 g/m³ | 1.66667 g/kg |
| 5 g/m³ | 4.16667 g/kg |
| 8 g/m³ | 6.66667 g/kg |
| 10 g/m³ | 8.33333 g/kg |
| 15 g/m³ | 12.5 g/kg |
| 17 g/m³ | 14.1667 g/kg |
| 20 g/m³ | 16.6667 g/kg |
| 25 g/m³ | 20.8333 g/kg |
| 30 g/m³ | 25 g/kg |
| 50 g/m³ | 41.6667 g/kg |
Quick answers
Quick answers
- How many g/m³ is 1 g/kg?
- 1 g/kg is 1.2 g/m³.
- How many g/m³ is 10 g/kg?
- 10 g/kg is 12 g/m³.
- How many g/m³ is 50 g/kg?
- 50 g/kg is 60 g/m³.
The units
About these units
Mixing ratio (g/kg)
Grams of water per kilogram of dry air, the meteorologist’s unit.
Grams per cubic meter (g/m³)
Absolute humidity: the actual water in the air.
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