Physics

Find density, mass or volume of any object from the other two values, with unit conversion between kg/L, g/cm³, kg/m³ and more in one search.

Find the horizontal, vertical, manhattan (grid) and straight-line distance between two points on a plane, using the distance formula.

Estimate engine horsepower from torque and RPM in metric or imperial units, with kW conversion.

Find how much of a radioactive substance remains after a given time. Amount left, fraction remaining, decayed amount and decay constant.

Calculate horsepower from torque and RPM, or convert power between horsepower, kilowatts and watts.

Compute the mass of any object from density and volume in metric or imperial units, with weight on Earth, the Moon or Mars.

Calculate speed, distance or time from the other two with the speed-distance-time formula, including mph conversion and running pace.