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Stainless Steel Technical Tool

Ra to Rz Converter

Convert surface roughness Ra and Rz values for stainless steel finish specifications and purchasing discussions.

TECHNICAL CALCULATORFORMULA INCLUDED

Technical calculator

Ra to Rz Converter

Convert surface roughness Ra and Rz values for stainless steel finish specifications and purchasing discussions.

Ra to Rz Converter

Enter either Ra or Rz, then calculate the matching indicative roughness value.

FormulaRz ≈ 4 × Ra; Ra ≈ Rz ÷ 4. Values are indicative and depend on the measurement method and surface profile.

Enter values and keep the result with the quotation assumptions.

Calculation result

Enter values and calculate.

Use the calculated result for early planning, then confirm the specification and supplier data before ordering.

  • Two-way Ra and Rz conversion
  • Surface roughness specification alignment
  • Downloadable conversion result

Technical reference

Ra to Rz Converter basis and limits

This converter provides an indicative Ra and Rz relationship for early stainless steel surface-finish comparisons.

Confirm the test method, sampling direction, instrument settings, finish standard and supplier certificate before making a final purchasing decision.

Important Use the result for quotation preparation and early planning; it does not replace a certified measurement, drawing review or supplier confirmation.

Calculation method

Formula and worked example

01

Ra to Rz Converter formula

Use the inputs and units shown in the calculator, then review the assumptions before using the estimate.

Rz ≈ 4 × Ra; Ra ≈ Rz ÷ 4. Values are indicative and depend on the measurement method and surface profile.
02

Worked example

A measured Ra of 1.60 µm corresponds to an indicative Rz of approximately 6.40 µm.

Rz ≈ 4 × Ra; Ra ≈ Rz ÷ 4.

Purchasing guide

Buying notes

State the requested finish, roughness parameter, measurement method, sampling length and certificate requirement so the supplier can confirm the specification.

01

Input units

Use the units shown beside each field.

02

Formula check

Review the formula and worked example.

03

Grade context

Record grade, standard and material condition.

04

Tolerance

Keep tolerances with the quotation record.

05

Application

State the process or fabrication use.

06

Delivery

Include quantity, destination and target date.

Quotation planning

How to use this estimate

Use the calculated result to compare supplier offers and prepare a quote, then confirm the exact grade, standard, dimensions and test requirements.

Review limits

What can change the result

  • Input units, rounding and dimensional tolerances.
  • Material density, condition and processing allowance.
  • Keep source values with the quotation record.

Request for quotation

Send your Ra to Rz Converter requirement

Include the calculated result together with grade, product form, dimensions, standard, application, quantity and destination.

  • Grade and standard
  • Product form and dimensions
  • Application, quantity and destination
SSM Quote Request

Frequently asked questions

Ra to Rz Converter FAQ

It provides an indicative ra to rz converter result from the values entered and the stated assumptions.