Inch per Year (ipy)
The inch per year (ipy) is 1000 mpy, or 25.4 mm/y. It appears in older corrosion tables and handbooks.
Symbol: ipy
Quantity: corrosion rate (thickness loss per year)
SI relation: 1 ipy = 25.4 mm/y (exact)
Derivation: 1 ipy = 25.4 mm/y = 1000 mpy (exact)
Exact: yes, by definition
Typical uses
- Older corrosion resistance tables
- Severe corrosion rates in chemical service
Convert inches per year to other units
| Conversion | 1 ipy equals | Reverse |
|---|---|---|
| inch per year to millimetre per year | 25.4 mm/y | millimetre per year to inch per year |
| inch per year to mil per year | 1000 mpy | mil per year to inch per year |
| inch per year to micrometre per year | 25400 µm/y | micrometre per year to inch per year |
Open the Corrosion Rate Converter to convert any value between all units.
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".
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). Inch per Year (ipy). Retrieved October 25, 2026, from https://scientificconverters.com/units/inch-per-year/
IEEE
Scientific Converters, "Inch per Year (ipy)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/units/inch-per-year/