Micrometers Ra to nanometers Ra
Type a value in µm Ra to get it in nm Ra instantly.
1,600nm Ra
That's about the same as a machined surface. A human hair is about 43.75 times that height.
What it means
How rough is that?
Ra is an average of the deviations, so two surfaces with the same Ra can feel and wear quite differently. Ra and Rq relate exactly only for a sine profile.
The math
How to convert µm Ra to nm Ra
To convert micrometers Ra to nanometers Ra, multiply by 1,000.
Example: 1.6 µm Ra × 1,000 = 1,600 nm Ra.
In the other direction, 1 nm Ra = 0.001 µm Ra.
Every unit
Your roughness in every unit
Tables
µm Ra to nm Ra conversion table
| µm Ra | nm Ra |
|---|---|
| 0.025 µm Ra | 25 nm Ra |
| 0.05 µm Ra | 50 nm Ra |
| 0.1 µm Ra | 100 nm Ra |
| 0.2 µm Ra | 200 nm Ra |
| 0.4 µm Ra | 400 nm Ra |
| 0.8 µm Ra | 800 nm Ra |
| 1.6 µm Ra | 1,600 nm Ra |
| 3.2 µm Ra | 3,200 nm Ra |
| 6.3 µm Ra | 6,300 nm Ra |
| 12.5 µm Ra | 12,500 nm Ra |
| 25 µm Ra | 25,000 nm Ra |
| 50 µm Ra | 50,000 nm Ra |
nm Ra to µm Ra conversion table
| nm Ra | µm Ra |
|---|---|
| 0.025 nm Ra | 2.5×10⁻⁵ µm Ra |
| 0.05 nm Ra | 5×10⁻⁵ µm Ra |
| 0.1 nm Ra | 0.0001 µm Ra |
| 0.2 nm Ra | 0.0002 µm Ra |
| 0.4 nm Ra | 0.0004 µm Ra |
| 0.8 nm Ra | 0.0008 µm Ra |
| 1.6 nm Ra | 0.0016 µm Ra |
| 3.2 nm Ra | 0.0032 µm Ra |
| 6.3 nm Ra | 0.0063 µm Ra |
| 12.5 nm Ra | 0.0125 µm Ra |
| 25 nm Ra | 0.025 µm Ra |
| 50 nm Ra | 0.05 µm Ra |
Quick answers
Quick answers
- How many nm Ra is 1 µm Ra?
- 1 µm Ra is 1,000 nm Ra.
- How many nm Ra is 10 µm Ra?
- 10 µm Ra is 10,000 nm Ra.
- How many nm Ra is 1.6 µm Ra?
- 1.6 µm Ra is 1,600 nm Ra.
The units
About these units
Micrometers Ra (µm Ra)
The international standard for average roughness.
Nanometers Ra (nm Ra)
For optical and semiconductor surfaces.
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