Permeability (0°C) (perm (0°C))
Perm (0°C) equals 5.72135×10⁻¹¹ kg/(Pa·s·m²) — the US building-science perm unit referenced at 0°C.
Perm at 0°C rates vapor permeance of house wraps, sheathing, and insulation in US construction codes.
Permeability (0°C) to Permeability (23°C)
Convert permeability (0°c) to permeability (23°c) instantly. Type in either field — results update live.
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Permeability Permeability (0°C) Permeability (23°C)
1 permeability (0°c) = 0.9958400418 perm (23°C) units
Unit
Unit
Conversion table
Selected perm (0°C) values converted to perm (23°C) using the exact factor from this tool.
| perm (0°C) | perm (23°C) |
|---|---|
| 0.01 | 0.0099584004 |
| 0.1 | 0.0995840042 |
| 1 | 0.9958400418 |
| 2 | 1.9916800835 |
| 3 | 2.9875201253 |
| 5 | 4.9792002089 |
| 10 | 9.9584004177 |
| 20 | 19.9168008355 |
| 50 | 49.7920020887 |
| 100 | 99.5840041774 |
| 1,000 | 995.8400417736 |
How to convert
Exact conversion factors in both directions, plus a worked example.
1 perm (0°C) = 0.9958400418 perm (23°C)
1 perm (23°C) = 1.0041773358 perm (0°C)
To convert permeability (0°c) to permeability (23°c), multiply by 0.9958400418.
To convert permeability (23°c) to permeability (0°c), multiply by 1.0041773358.
Example: convert 10 perm (0°C) to perm (23°C)
10 × 0.9958400418 = 9.9584004177 perm (23°C)
About these units
Short background on the units used in this conversion.
Permeability (23°C) (perm (23°C))
Perm (23°C) equals 5.74525×10⁻¹¹ kg/(Pa·s·m²) — the perm unit referenced at 23°C laboratory conditions.
Perm at 23°C is used when test methods specify room-temperature reference conditions for vapor barriers.
Frequently asked questions
How many perm (23°C) units are in one permeability (0°c)?
One permeability (0°c) equals 0.9958400418 perm (23°C) units. Multiply your perm (0°C) units value by 0.9958400418 to convert to perm (23°C) units.
What is the conversion formula?
perm (23°C) = perm (0°C) × 0.9958400418The reverse is
perm (0°C) = perm (23°C) × 1.0041773358, using the same exact factors as this converter.Is this Permeability (0°C) to Permeability (23°C) converter private?
Yes. All calculations run locally in your browser. Nothing you type is sent to a server.
All permeability (0°c) conversions
Jump to any permeability conversion starting from permeability (0°c) — including the reverse direction and every other unit in our dataset.