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eng.surface-roughness-conversion Calculator
Converts surface roughness between Ra, Rq (RMS), Rz (maximum height), and N-grade designations. Ra to Rq conversion: Rq ≈ 1.25 × Ra for a Gaussian surface — Rz is typically 4–8× Ra depending on process.
Inputs
Ra Um
Reference formula or conversion factor shown for context.
Results
Ra (arithmetic mean) µm
Arithmetic average — sum divided by count. Simple and familiar, but pulled by outliers. If your data contains extreme values, the median may be more representative.
Rq / RMS µm
Reference formula or conversion factor shown for context.
Rz (10-point mean) µm
Arithmetic average — sum divided by count. Simple and familiar, but pulled by outliers. If your data contains extreme values, the median may be more representative.
N-grade (ISO)
Letter or numerical grade indicating quality, creditworthiness, or performance on a defined scale.
machined finish comparison
Sample size or count used in the calculation.
Ra = Rq/1.25 ≈ Rz/7
Reference formula or conversion factor shown for context.