Micrometres per Year to Inches per Year (µm/y to ipy)
1 micrometre per year (µm/y) = 0.00003937007874 inches per year (ipy). 1 ipy = 25400 µm/y. Example: 15 µm/y = 15 × 0.00003937007874 = 0.0005905511811 ipy.
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1 µm/y = 0.00003937007874 ipy
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk micrometre per year to inch per year converter to paste a column from Excel.
How to Convert Micrometre per Year to Inch per Year
- 1 µm/y = 0.00003937007874 ipy
- 1 ipy = 25400 µm/y
- Example: convert 15 µm/y to ipy: 15 µm/y = 15 × 0.00003937007874 ipy = 0.0005905511811 ipy
Formula
ipy = µm/y ÷ 25400
Derivation from SI units:
- 1 µm/y = 0.001 mm/y
- 1 ipy = 25.4 mm/y = 1000 mpy (exact)
- 1 µm/y = 0.001 mm/y ÷ 25.4 mm/y per ipy = 0.00003937007874016 ipy
Both units are defined exactly, so the factor is exact. Micrometre per Year definition: micrometre per year; Inch per Year definition: inch per year.
Worked examples
- A reading of 5 µm/y converts to 0.0001968503937 ipy.
5 µm/y × 0.00003937007874 = 0.0001968503937 ipy - A value of 50 µm/y is 0.001968503937 ipy.
50 µm/y × 0.00003937007874 = 0.001968503937 ipy
Micrometre per Year to Inch per Year conversion table
| Micrometres per Year (µm/y) | Inches per Year (ipy) |
|---|---|
| 0.1 µm/y | 0.000003937007874 ipy |
| 1 µm/y | 0.00003937007874 ipy |
| 2 µm/y | 0.00007874015748 ipy |
| 5 µm/y | 0.0001968503937 ipy |
| 10 µm/y | 0.0003937007874 ipy |
| 25 µm/y | 0.0009842519685 ipy |
| 50 µm/y | 0.001968503937 ipy |
| 80 µm/y | 0.003149606299 ipy |
| 100 µm/y | 0.003937007874 ipy |
| 200 µm/y | 0.007874015748 ipy |
Where it's used
Micrometres per Year are used for atmospheric corrosion and galvanised coating life, while inches per year appear in older corrosion resistance tables. Both measure corrosion rate (thickness loss per year), so the conversion is a fixed factor.
Micrometre per Year to other corrosion rate units
| Conversion | 1 µm/y equals |
|---|---|
| micrometre per year to inch per year | 0.00003937007874 ipy |
| micrometre per year to millimetre per year | 0.001 mm/y |
| micrometre per year to mil per year | 0.03937007874 mpy |
Frequently asked questions
How many inches per year are in 1 micrometre per year?
1 µm/y = 0.00003937007874 ipy.
How do I convert micrometres per year to inches per year?
Multiply the value in µm/y by 0.00003937007874, or divide it by 25400. For example, 15 µm/y × 0.00003937007874 = 0.0005905511811 ipy.
Is the µm/y to ipy conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology .
- 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). Micrometres per Year to Inches per Year (µm/y to ipy). Retrieved October 25, 2026, from https://scientificconverters.com/corrosion-rate/micrometers-per-year-to-inches-per-year/
IEEE
Scientific Converters, "Micrometres per Year to Inches per Year (µm/y to ipy)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/corrosion-rate/micrometers-per-year-to-inches-per-year/