Pile driving formulas (Hiley / Gates) calculator

Inputs in the worked example

The live calculator starts with these values; change any of them and every result, check and diagram updates instantly.

Worked example — results

• ✗ φg·Ru ≥ R*
• ✓ Set ≥ 2 mm (avoid hard driving damage)

Method, formulas and assumptions

• Hiley: Ru = η·W·h·[(W + e²P)/(W + P)] / (s + c/2)
• Gates (FHWA, SI): Ru = 7√(E [J]) · log10(10·Nb) − 550, Nb = blows per 25 mm
• Dynamic formulae are approximate: confirm with PDA/CAPWAP or static load tests

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