Grams per cubic meter to grains per cubic foot
Type a value in g/m³ to get it in gr/ft³ instantly.
21.85gr/ft³
That's 2× as humid as tropical air — nothing on our list beats it. A 50 m³ room at that level holds about 2,500 mL of water.
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/m³ to gr/ft³
To convert grams per cubic meter to grains per cubic foot, multiply by 0.436996.
Example: 50 g/m³ × 0.436996 = 21.8498 gr/ft³.
In the other direction, 1 gr/ft³ = 2.28835 g/m³.
The table below is for air at 0 °C, freezing.
Every unit
Your humidity in every unit
Tables
g/m³ to gr/ft³ conversion table
| g/m³ | gr/ft³ |
|---|---|
| 1 g/m³ | 0.436996 gr/ft³ |
| 2 g/m³ | 0.873991 gr/ft³ |
| 5 g/m³ | 2.18498 gr/ft³ |
| 8 g/m³ | 3.49597 gr/ft³ |
| 10 g/m³ | 4.36996 gr/ft³ |
| 15 g/m³ | 6.55494 gr/ft³ |
| 17 g/m³ | 7.42893 gr/ft³ |
| 20 g/m³ | 8.73991 gr/ft³ |
| 25 g/m³ | 10.9249 gr/ft³ |
| 30 g/m³ | 13.1099 gr/ft³ |
| 50 g/m³ | 21.8498 gr/ft³ |
gr/ft³ to g/m³ conversion table
| gr/ft³ | g/m³ |
|---|---|
| 1 gr/ft³ | 2.28835 g/m³ |
| 2 gr/ft³ | 4.5767 g/m³ |
| 5 gr/ft³ | 11.4418 g/m³ |
| 8 gr/ft³ | 18.3068 g/m³ |
| 10 gr/ft³ | 22.8835 g/m³ |
| 15 gr/ft³ | 34.3253 g/m³ |
| 17 gr/ft³ | 38.902 g/m³ |
| 20 gr/ft³ | 45.767 g/m³ |
| 25 gr/ft³ | 57.2088 g/m³ |
| 30 gr/ft³ | 68.6506 g/m³ |
| 50 gr/ft³ | 114.418 g/m³ |
Quick answers
Quick answers
- How many gr/ft³ is 1 g/m³?
- 1 g/m³ is 0.436996 gr/ft³.
- How many gr/ft³ is 10 g/m³?
- 10 g/m³ is 4.36996 gr/ft³.
- How many gr/ft³ is 50 g/m³?
- 50 g/m³ is 21.8498 gr/ft³.
The units
About these units
Grams per cubic meter (g/m³)
Absolute humidity: the actual water in the air.
Grains per cubic foot (gr/ft³)
The US HVAC unit for absolute humidity.
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