// multi-utility computation suite · offline · instant · precise
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eng.surface-roughness-Ra Calculator
Calculates arithmetic mean roughness Ra and converts between Ra, Rz, and Rmax surface finish parameters. Ra is the most commonly specified surface finish parameter — it represents the average absolute deviation of the surface profile from the mean line.
Inputs
Feed Mm Rev
Reference formula or conversion factor shown for context.
Nose Radius Mm
Distance from centre to edge of a circle. Radius = diameter / 2.
Vibration Amplitude Um
Maximum displacement from equilibrium. Energy carried by a wave is proportional to amplitude squared.
Results
theoretical Ra (μm)
Reference formula or conversion factor shown for context.
practical Ra estimate (μm)
The value at the specified point or condition.
Ra = f²/(32R) × 1000 μm
Reference formula or conversion factor shown for context.
surface grade
Letter or numerical grade indicating quality, creditworthiness, or performance on a defined scale.
reducing Ra
Sample size or count used in the calculation.
ISO 1302 surface symbol
Reference formula or conversion factor shown for context.