Rock Mass Rating (RMR) Calculations

Application: Geotechnics

  • Format: Online Tool Tool Tip
  • Fee for Use: Free Tool Tip
  • Enrollment: Not Required Tool Tip
Rock Mass Rating (RMR) Calculations


An interactive design tool for determination of Rock Mass Rating and Rock Mass Classification for mining and tunnelling conditions.

Notes on Rock Mass Rating (RMR)

  • RMR values obtained are for mining and tunnelling applications
  • Strength of Intact Rock is in terms of uniaxial compressive strength
  • For assistance with interpretation of other conditions see RMR Design Tables
  • For interpretation of Rock Mass Classification see RMR Design Tables

Tool Parameters

Values displayed with a may be changed ... click on a value to display an entry form ... or use the arrows right of a value to select from a list.

Tool Behaviour

This tool exhibits spreadsheet-like behaviour ... change a value and related values are re-calculated automatically.

SVG Plugin

This tool needs SVG viewing capabilities. If your browser does not support SVG then download the Adobe plugin here.

Download Adobe SVG here