How do I calculate Surface Roughness Conversion?

To calculate Surface Roughness Conversion: Enter Input value, From unit. Click Calculate. INDUGRID computes the result instantly using the formula: Rz approx 4-7 x Ra | N-grade: N1=Ra0.025, N2=Ra0.05, N3=Ra0.1, N4=Ra0.2, N5=Ra0.4, N6=Ra0.8, N7=Ra1.6, N8=Ra3.2, N9=Ra6.3. No registration required.

Is the Surface Roughness Conversion calculator free?

Yes. The INDUGRID Surface Roughness Conversion calculator is completely free, requires no account or login, and works on desktop and mobile browsers.

Tolerances & Fits

Surface Roughness Conversion

Convert between Ra, Rz, Rmax and CLA (Centre Line Average) surface roughness values, and find corresponding machining process and ISO grades.

Units:

in LinkedIn

💡Ra = arithmetic mean deviation (most common). Rz = mean roughness depth (10-point). Rmax = maximum profile height. Rz is approximately 4-7x Ra. For sealing surfaces: Ra < 1.6 um. Bearing seats: Ra 0.4-0.8 um.

Rz approx 4-7 x Ra | N-grade: N1=Ra0.025, N2=Ra0.05, N3=Ra0.1, N4=Ra0.2, N5=Ra0.4, N6=Ra0.8, N7=Ra1.6, N8=Ra3.2, N9=Ra6.3

Input

Input value iEnter the known surface roughness value.

From unit iSelect the surface roughness parameter you know.

Result

Ra [um] —

Rz (approx) [um] —

Rmax (approx) [um] —

CLA [microinch] —

ISO N-grade —

Typical machining process —

Typical application —