GSTIN: 29AAHCH5227L1Z6
•ISO 9001:2015
Surface Finish Converter
Convert between Ra, Rz, Rq, Rt and units (μm, μin, nm)
Input Values
Average Roughness (Ra)
Arithmetic average of absolute values of profile deviations from the mean line
Most commonly used parameter
Converted Values
| Parameter | Micrometers (μm) | Microinches (μin) | Nanometers (nm) |
|---|---|---|---|
Ra - Average RoughnessMost Common | 0.00 | 0.00 | 0 |
| Rz - Maximum Height | 0.00 | 0.00 | 0 |
| Rq - RMS Roughness | 0.00 | 0.00 | 0 |
| Rt - Total Height | 0.00 | 0.00 | 0 |
⚠️ Precision Notice:
Unit conversions are precise (μm ↔ μin ↔ nm). However, parameter conversions are approximate estimates. There is no fixed mathematical relationship between Ra, Rz, Rq, and Rt.
Industry standard conversion ratios:
- Rz ≈ 7.2 × Ra (per ISO/ANSI standards, range: 5-10×)
- Rq ≈ 1.1 × Ra (RMS relationship, confirmed)
- Rt ≈ 5.5 × Ra (typical range: 4-7×)
For precise measurements, always use actual measured values from a calibrated surface roughness tester or profilometer.