Millimetres per Year to Micrometres per Year (mm/y to µm/y)
1 millimetre per year (mm/y) = 1000 micrometres per year (µm/y). 1 µm/y = 0.001 mm/y. Example: 15 mm/y = 15 × 1000 = 15000 µm/y.
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1 mm/y = 1000 µm/y
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millimetre per year to micrometre per year converter to paste a column from Excel.
How to Convert Millimetre per Year to Micrometre per Year
- 1 mm/y = 1000 µm/y
- 1 µm/y = 0.001 mm/y
- Example: convert 15 mm/y to µm/y: 15 mm/y = 15 × 1000 µm/y = 15000 µm/y
Formula
µm/y = mm/y × 1000
Derivation from SI units:
- Thickness loss in millimetres per year of exposure (the reference unit for corrosion rate)
- 1 µm/y = 0.001 mm/y
Both units are defined exactly, so the factor is exact. Millimetre per Year definition: millimetre per year; Micrometre per Year definition: micrometre per year.
Worked examples
- A reading of 0.05 mm/y converts to 50 µm/y.
0.05 mm/y × 1000 = 50 µm/y - A value of 0.5 mm/y is 500 µm/y.
0.5 mm/y × 1000 = 500 µm/y
Millimetre per Year to Micrometre per Year conversion table
| Millimetres per Year (mm/y) | Micrometres per Year (µm/y) |
|---|---|
| 0.001 mm/y | 1 µm/y |
| 0.01 mm/y | 10 µm/y |
| 0.025 mm/y | 25 µm/y |
| 0.05 mm/y | 50 µm/y |
| 0.1 mm/y | 100 µm/y |
| 0.13 mm/y | 130 µm/y |
| 0.25 mm/y | 250 µm/y |
| 0.5 mm/y | 500 µm/y |
| 1 mm/y | 1000 µm/y |
| 1.27 mm/y | 1270 µm/y |
| 5 mm/y | 5000 µm/y |
Where it's used
Millimetres per Year are used for corrosion coupon and weight-loss tests, while micrometres per year appear in atmospheric corrosion and galvanised coating life. Both measure corrosion rate (thickness loss per year), so the conversion is a fixed factor.
Millimetre per Year to other corrosion rate units
| Conversion | 1 mm/y equals |
|---|---|
| millimetre per year to micrometre per year | 1000 µm/y |
| millimetre per year to mil per year | 39.37007874 mpy |
| millimetre per year to inch per year | 0.03937007874 ipy |
Frequently asked questions
How many micrometres per year are in 1 millimetre per year?
1 mm/y = 1000 µm/y.
How do I convert millimetres per year to micrometres per year?
Multiply the value in mm/y by 1000. For example, 15 mm/y × 1000 = 15000 µm/y.
Is the mm/y to µm/y conversion exact?
Yes. Both units are defined exactly, and 1 mm/y is exactly 1000 µm/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). Millimetres per Year to Micrometres per Year (mm/y to µm/y). Retrieved October 25, 2026, from https://scientificconverters.com/corrosion-rate/millimeters-per-year-to-micrometers-per-year/
IEEE
Scientific Converters, "Millimetres per Year to Micrometres per Year (mm/y to µm/y)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/corrosion-rate/millimeters-per-year-to-micrometers-per-year/