Micrometres per Year to Millimetres per Year (µm/y to mm/y)
1 micrometre per year (µm/y) = 0.001 millimetres per year (mm/y). 1 mm/y = 1000 µm/y. Example: 15 µm/y = 15 × 0.001 = 0.015 mm/y.
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1 µm/y = 0.001 mm/y
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk micrometre per year to millimetre per year converter to paste a column from Excel.
How to Convert Micrometre per Year to Millimetre per Year
- 1 µm/y = 0.001 mm/y
- 1 mm/y = 1000 µm/y
- Example: convert 15 µm/y to mm/y: 15 µm/y = 15 × 0.001 mm/y = 0.015 mm/y
Formula
mm/y = µm/y ÷ 1000
Derivation from SI units:
- 1 µm/y = 0.001 mm/y
- Thickness loss in millimetres per year of exposure (the reference unit for corrosion rate)
Both units are defined exactly, so the factor is exact. Micrometre per Year definition: micrometre per year; Millimetre per Year definition: millimetre per year.
Worked examples
- A reading of 5 µm/y converts to 0.005 mm/y.
5 µm/y × 0.001 = 0.005 mm/y - A value of 50 µm/y is 0.05 mm/y.
50 µm/y × 0.001 = 0.05 mm/y
Micrometre per Year to Millimetre per Year conversion table
| Micrometres per Year (µm/y) | Millimetres per Year (mm/y) |
|---|---|
| 0.1 µm/y | 0.0001 mm/y |
| 1 µm/y | 0.001 mm/y |
| 2 µm/y | 0.002 mm/y |
| 5 µm/y | 0.005 mm/y |
| 10 µm/y | 0.01 mm/y |
| 25 µm/y | 0.025 mm/y |
| 50 µm/y | 0.05 mm/y |
| 80 µm/y | 0.08 mm/y |
| 100 µm/y | 0.1 mm/y |
| 200 µm/y | 0.2 mm/y |
Where it's used
Micrometres per Year are used for atmospheric corrosion and galvanised coating life, while millimetres per year appear in corrosion coupon and weight-loss tests. 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 millimetre per year | 0.001 mm/y |
| micrometre per year to mil per year | 0.03937007874 mpy |
| micrometre per year to inch per year | 0.00003937007874 ipy |
Frequently asked questions
How many millimetres per year are in 1 micrometre per year?
1 µm/y = 0.001 mm/y.
How do I convert micrometres per year to millimetres per year?
Multiply the value in µm/y by 0.001, or divide it by 1000. For example, 15 µm/y × 0.001 = 0.015 mm/y.
Is the µm/y to mm/y conversion exact?
Yes. Both units are defined exactly, and 1 µm/y is exactly 0.001 mm/y.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology .
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 Millimetres per Year (µm/y to mm/y). Retrieved October 25, 2026, from https://scientificconverters.com/corrosion-rate/micrometers-per-year-to-millimeters-per-year/
IEEE
Scientific Converters, "Micrometres per Year to Millimetres per Year (µm/y to mm/y)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/corrosion-rate/micrometers-per-year-to-millimeters-per-year/