Inches of snow to millimeters of water
Type a value in in snow to get it in mm SWE instantly.
38.1mm SWE
That's 3.8× as deep as a good covering, while a good ski base is 2.6× deeper. On a 10 m by 10 m roof that is about 3,810 liters of water.
Convert the other way: mm SWE to in snow
What it means
How much water is that?
Snow density changes as a pack settles, so a measured depth converts differently on the day it falls and a week later.
The math
How to convert in snow to mm SWE
Depth becomes water through the density: water in mm = snow depth in mm × density fraction. The figures below use the snow type selected above.
Example: 30 in snow = 38.1 mm SWE.
The table below is for Cold powder (5% water).
Every unit
Your snow in every unit
Tables
in snow to mm SWE conversion table
| in snow | mm SWE |
|---|---|
| 1 in snow | 1.27 mm SWE |
| 5 in snow | 6.35 mm SWE |
| 10 in snow | 12.7 mm SWE |
| 25 in snow | 31.75 mm SWE |
| 50 in snow | 63.5 mm SWE |
| 100 in snow | 127 mm SWE |
| 200 in snow | 254 mm SWE |
| 300 in snow | 381 mm SWE |
| 500 in snow | 635 mm SWE |
| 1,000 in snow | 1,270 mm SWE |
mm SWE to in snow conversion table
| mm SWE | in snow |
|---|---|
| 1 mm SWE | 0.787402 in snow |
| 5 mm SWE | 3.93701 in snow |
| 10 mm SWE | 7.87402 in snow |
| 25 mm SWE | 19.685 in snow |
| 50 mm SWE | 39.3701 in snow |
| 100 mm SWE | 78.7402 in snow |
| 200 mm SWE | 157.48 in snow |
| 300 mm SWE | 236.22 in snow |
| 500 mm SWE | 393.701 in snow |
| 1,000 mm SWE | 787.402 in snow |
Quick answers
Quick answers
- How many mm SWE is 1 in snow?
- 1 in snow is 1.27 mm SWE.
- How many mm SWE is 10 in snow?
- 10 in snow is 12.7 mm SWE.
- How many mm SWE is 30 in snow?
- 30 in snow is 38.1 mm SWE.
The units
About these units
Inches of snow (in snow)
The depth in inches, as US forecasts give it.
Millimeters of water (mm SWE)
The water the snow holds, which is what actually matters.
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