// multi-utility computation suite · offline · instant · precise
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sci.rock-mass-rating-RMR Calculator
Calculates RMR and converts to tunnel stand-up time and span limits for underground excavations. Stand-up time for a 3 m span in RMR = 60 rock: ~1 week without support — this determines the practical window for installing rock bolts and shotcrete before collapse.
Inputs
Ucs Mpa
Reference formula or conversion factor shown for context.
Rqd Pct
Reference formula or conversion factor shown for context.
Spacing Cm
Reference formula or conversion factor shown for context.
Condition Score
Reference formula or conversion factor shown for context.
Groundwater Score
Reference formula or conversion factor shown for context.
Results
RMR total
The combined total across all inputs and components.
UCS rating r1
A standardised quality or risk rating on the applicable scale.
RQD rating r2
A standardised quality or risk rating on the applicable scale.
spacing rating r3
A standardised quality or risk rating on the applicable scale.
Bieniawski 1973/1989 Rock Mass Rating
A standardised quality or risk rating on the applicable scale.
rock mass class
The classification assigned based on the computed value.