Millimeters per year to mils per year
Type a value in mm/yr to get it in mpy instantly.
393.7mpy
That's 2× as fast as poor resistance — nothing on our list beats it. A 10 mm wall would last about 1 years at that rate.
Convert the other way: mpy to mm/yr
What it means
How fast is it going?
These are uniform corrosion rates. Pitting attacks one spot far faster than the average, so a good overall rate can still perforate a pipe.
The math
How to convert mm/yr to mpy
To convert millimeters per year to mils per year, multiply by 39.3701.
Example: 10 mm/yr × 39.3701 = 393.701 mpy.
In the other direction, 1 mpy = 0.0254 mm/yr.
Every unit
Your rate in every unit
Tables
mm/yr to mpy conversion table
| mm/yr | mpy |
|---|---|
| 0.01 mm/yr | 0.393701 mpy |
| 0.05 mm/yr | 1.9685 mpy |
| 0.1 mm/yr | 3.93701 mpy |
| 0.25 mm/yr | 9.84252 mpy |
| 0.5 mm/yr | 19.685 mpy |
| 1 mm/yr | 39.3701 mpy |
| 2 mm/yr | 78.7402 mpy |
| 5 mm/yr | 196.85 mpy |
| 10 mm/yr | 393.701 mpy |
| 25 mm/yr | 984.252 mpy |
| 50 mm/yr | 1,968.5 mpy |
mpy to mm/yr conversion table
| mpy | mm/yr |
|---|---|
| 0.01 mpy | 0.000254 mm/yr |
| 0.05 mpy | 0.00127 mm/yr |
| 0.1 mpy | 0.00254 mm/yr |
| 0.25 mpy | 0.00635 mm/yr |
| 0.5 mpy | 0.0127 mm/yr |
| 1 mpy | 0.0254 mm/yr |
| 2 mpy | 0.0508 mm/yr |
| 5 mpy | 0.127 mm/yr |
| 10 mpy | 0.254 mm/yr |
| 25 mpy | 0.635 mm/yr |
| 50 mpy | 1.27 mm/yr |
Quick answers
Quick answers
- How many mpy is 1 mm/yr?
- 1 mm/yr is 39.3701 mpy.
- How many mpy is 10 mm/yr?
- 10 mm/yr is 393.701 mpy.
The units
About these units
Millimeters per year (mm/yr)
The international standard for corrosion rate.
Mils per year (mpy)
The US unit: thousandths of an inch a year.
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