// multi-utility computation suite · offline · instant · precise
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eng.rotary-drilling-penetration Calculator
Calculates drilling rate of penetration (ROP) from bit wear, weight on bit, RPM, and formation hardness using the Warren-Bourgoyne model. ROP decreases with bit wear — the optimal bit run ends when the cumulative cost of the worn bit (drilling + trip time) exceeds the cost of a new bit.
Inputs
Weight On Bit Kn
Body or object weight. For health calculators, usually in kg or lbs.
Bit Rpm
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Bit Diameter Mm
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
Rock Hardness Ucs Mpa
Reference formula or conversion factor shown for context.