Science

Estimate the BTU/hr cooling and heating capacity a room or house needs, based on area, ceiling height, insulation, sun, climate and occupancy.

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 the daily, monthly and yearly cost of any appliance from its power rating in watts, run time and your per-unit electricity rate, plus a carbon footprint estimate.

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 molarity (M) from moles of solute and solution volume in litres, with millimoles and millilitre conversions.

Calculate molar mass in grams per mole from mass and moles or by summing element atomic weights, plus sample mass and molecule count.

Solve Ohm's law and Joule's law from any two known values: voltage, current, resistance or power, each in SI units with one click.

Decode a four-band resistor from its colour code: nominal resistance, tolerance and the minimum and maximum value range, with a logarithmic scale gauge.

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

Find voltage drop over a wire run from voltage, current, length, AWG gauge and conductor material, with drop percent and load voltage.