Browse by category

Electrical and engineering calculators

Practical, free tools with clear explanations. Choose a tool to get started.

Estimate voltage drop in a copper conductor using a simplified resistance model.

Calculate voltage, current, resistance and power from any two known values.

Estimate real power from voltage, current, power factor and phase.

Estimate daily and monthly solar energy from array size and peak sun hours.

Estimate a rough cooling-capacity starting point from room area and an adjustable factor.

Calculate rectangular concrete volume and an optional overage allowance.

Estimate paint volume from surface area, coats and coverage.

Estimate tile count and area with an optional cutting/waste allowance.

Calculate the area, perimeter and volume of a rectangular space.