US perms to metric perms
Type a value in perm to get it in perm (metric) instantly.
That's 1.25× as open as vapor retarder paint, while plasterboard is 30× higher. That is semi-permeable: a wall built with it can still dry.
Convert the other way: perm (metric) to perm
What it means
How much vapor gets through?
Permeance belongs to a material of a stated thickness. Permeability — perm-inches — belongs to the material itself, and must be divided by the thickness.
The math
How to convert perm to perm (metric)
To convert US perms to metric perms, multiply by 0.661798.
Example: 1 perm × 0.661798 = 0.661798 perm (metric).
In the other direction, 1 perm (metric) = 1.51103 perm.
Every unit
Your permeance in every unit
Tables
perm to perm (metric) conversion table
| perm | perm (metric) |
|---|---|
| 0.01 perm | 0.00661798 perm (metric) |
| 0.05 perm | 0.0330899 perm (metric) |
| 0.1 perm | 0.0661798 perm (metric) |
| 0.5 perm | 0.330899 perm (metric) |
| 1 perm | 0.661798 perm (metric) |
| 5 perm | 3.30899 perm (metric) |
| 10 perm | 6.61798 perm (metric) |
| 20 perm | 13.236 perm (metric) |
| 50 perm | 33.0899 perm (metric) |
| 100 perm | 66.1798 perm (metric) |
perm (metric) to perm conversion table
| perm (metric) | perm |
|---|---|
| 0.01 perm (metric) | 0.0151103 perm |
| 0.05 perm (metric) | 0.0755517 perm |
| 0.1 perm (metric) | 0.151103 perm |
| 0.5 perm (metric) | 0.755517 perm |
| 1 perm (metric) | 1.51103 perm |
| 5 perm (metric) | 7.55517 perm |
| 10 perm (metric) | 15.1103 perm |
| 20 perm (metric) | 30.2207 perm |
| 50 perm (metric) | 75.5517 perm |
| 100 perm (metric) | 151.103 perm |
Quick answers
Quick answers
- How many perm (metric) is 1 perm?
- 1 perm is 0.661798 perm (metric).
- How many perm (metric) is 10 perm?
- 10 perm is 6.61798 perm (metric).
The units
About these units
US perms (perm)
The US building unit: grains per hour per square foot per inch of mercury.
Metric perms (perm (metric))
Grams per 24 hours per square meter per mmHg. One is about 1.51 US perms.
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