Engineering Calculators

Voltage, current, resistance and power (V = IR). See formula, variable legend, worked example and unit conversions. Instant electronics solver.

Calculate engine horsepower from torque and RPM. Enter torque (lb-ft or Nm) and RPM — see HP and kW with conversion. Free.

File transfer time at any connection speed. Instant conversion with formula, worked example and all representations shown.

Step count, riser height and tread depth. Instant material estimate with formula, waste factor and step-by-step calculation guide.

Tiles needed for any room size with waste factor. Instant material estimate with formula, waste factor and step-by-step calculation guide.

Roofing squares and shingle bundles by pitch. Instant material estimate with formula, waste factor and step-by-step calculation guide.