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Rock Mass Rating Calculator

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Rock Mass Rating Calculator
Bieniawski RMR89 geomechanics classification with all 5 parameters
R1 — Strength of Intact Rock
R2 — Rock Quality Designation (RQD)
R3 — Spacing of Discontinuities
R4 — Condition of Discontinuities
R5 — Groundwater Conditions
Adjustment — Joint Orientation
Score Breakdown
R1 Strength
+15
max 15
R2 RQD
+20
max 20
R3 Spacing
+20
max 20
R4 Condition
+30
max 30
R5 Groundwater
+15
max 15
Joint Orientation
+0
100Class I — Very Good Rock
Support: Generally no support required
RMR Reference Scale
81–100
Class I
Very Good
61–80
Class II
Good
41–60
Class III
Fair
21–40
Class IV
Poor
0–20
Class V
Very Poor

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What is Rock Mass Rating Calculator?

Rock Mass Rating Calculator evaluates the quality and stability of rock masses for engineering projects such as tunnels, mines, and slopes by assigning ratings to key geological parameters.

Rock Mass Rating Calculator Formula / Method

RMR=R1+R2+R3+R4+R5+R6RMR = R1 + R2 + R3 + R4 + R5 + R6
(R1toR6=ratingsfromtablesforUCS,RQD,spacing,condition,groundwater,orientationadjustment)(R1 to R6 = ratings from tables for UCS, RQD, spacing, condition, groundwater, orientation adjustment)

Rock Mass Rating Calculator Step-by-Step

  1. Enter all required inputs shown in the calculator.
  2. Check units/scales or grading format where applicable.
  3. Apply the calculator method for this tool.
  4. Review the computed output.
  5. Use the result for planning, verification, or comparison.

Rock Mass Rating Calculator Worked Example

UCSrating=12,RQD=17,Spacing=15,Condition=20,Groundwater=10,Orientationadjustment=−5UCS rating = 12, RQD = 17, Spacing = 15, Condition = 20, Groundwater = 10, Orientation adjustment = −5
RMR=12+17+15+20+10−5=69−>GoodrockmassRMR = 12 + 17 + 15 + 20 + 10 − 5 = 69 -> Good rock mass

Where Rock Mass Rating Calculator Is Applied

Used in geotechnical engineering, mining, tunnel construction, slope stability analysis, and civil engineering projects involving rock excavations.

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