Convert Inches per Year to Mils per Year (ipy to mpy)
1 inch per year (ipy) = 1000 mils per year (mpy). 1 mpy = 0.001 ipy. Example: 15 ipy = 15 × 1000 = 15000 mpy.
Also searched as inches per year to mpy, inches per year in mpy, inches per year into mils per year, ipy to mpy, ipy in mils per year, ipy into mil per year, inch per year to mil per year, ipy to mils per year converter and how many mils per year in an inch per year.
1 ipy = 1000 mpy
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk inch per year to mil per year converter to paste a column from Excel.
How to Convert Inch per Year to Mil per Year
- 1 ipy = 1000 mpy
- 1 mpy = 0.001 ipy
- Example: convert 15 ipy to mpy: 15 ipy = 15 × 1000 mpy = 15000 mpy
Formula
mpy = ipy × 1000
Derivation from SI units:
- 1 ipy = 25.4 mm/y = 1000 mpy (exact)
- 1 mpy = 0.001 in per year = 0.0254 mm/y (exact)
- 1 ipy = 25.4 mm/y ÷ 0.0254 mm/y per mpy = 1000 mpy
Both units are defined exactly, so the factor is exact. Inch per Year definition: inch per year; Mil per Year definition: mil per year.
Worked examples
- A reading of 0.002 ipy converts to 2 mpy.
0.002 ipy × 1000 = 2 mpy - A value of 0.02 ipy is 20 mpy.
0.02 ipy × 1000 = 20 mpy
Inch per Year to Mil per Year conversion table
| Inches per Year (ipy) | Mils per Year (mpy) |
|---|---|
| 0.0001 ipy | 0.1 mpy |
| 0.0005 ipy | 0.5 mpy |
| 0.001 ipy | 1 mpy |
| 0.002 ipy | 2 mpy |
| 0.005 ipy | 5 mpy |
| 0.01 ipy | 10 mpy |
| 0.02 ipy | 20 mpy |
| 0.05 ipy | 50 mpy |
| 0.1 ipy | 100 mpy |
| 0.5 ipy | 500 mpy |
Where it's used
Inches per Year are used for older corrosion resistance tables, while mils per year appear in US oil, gas and process industry corrosion monitoring. Both measure corrosion rate (thickness loss per year), so the conversion is a fixed factor.
Inch per Year to other corrosion rate units
| Conversion | 1 ipy equals |
|---|---|
| inch per year to mil per year | 1000 mpy |
| inch per year to millimetre per year | 25.4 mm/y |
| inch per year to micrometre per year | 25400 µm/y |
Frequently asked questions
How many mils per year are in 1 inch per year?
1 ipy = 1000 mpy.
How do I convert inches per year to mils per year?
Multiply the value in ipy by 1000. For example, 15 ipy × 1000 = 15000 mpy.
Is the ipy to mpy conversion exact?
Yes. Both units are defined exactly, and 1 ipy is exactly 1000 mpy.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "inch".
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "mil".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Inches per Year to Mils per Year (ipy to mpy). Retrieved October 25, 2026, from https://scientificconverters.com/corrosion-rate/inches-per-year-to-mils-per-year/
IEEE
Scientific Converters, "Convert Inches per Year to Mils per Year (ipy to mpy)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/corrosion-rate/inches-per-year-to-mils-per-year/