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sci.rock-compressive-strength Calculator
Calculates unconfined compressive strength of rock from point load test index: UCS = k × Is(50), where k ≈ 24. Granite UCS is 100–250 MPa; shale is 5–100 MPa — UCS determines drill bit selection, tunnel support design, and pillar stability in mining.
Inputs
Uniaxial Load Kn
Applied force or weight (N or kN). Divide into dead load (permanent) and live load (variable — people, wind, etc.).
Sample Diameter Mm
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
Point Load Index Mpa
Applied force or weight (N or kN). Divide into dead load (permanent) and live load (variable — people, wind, etc.).
Results
UCS (MPa)
Reference formula or conversion factor shown for context.
rock class (ISRM)
The classification assigned based on the computed value.