Physics

Use this Ohms Law Calculator to compute voltage, current, or resistance instantly. Learn the formulas, units, and real-world tips.

Use this Electric Field Calculator to find electric field strength from charge, voltage, distance, or plate geometry. Get results in standard units.

Use a Voltage Drop Calculator to estimate how much voltage is lost in a cable run. Size conductors correctly to prevent dimming and motor issues.

Use this Electricity Cost Calculator to estimate monthly electricity cost from your kWh usage, rate, and time of use.

Use an Amp Hour Calculator to estimate how long a battery will run a device. Convert between amps, hours, and battery capacity.

Use a Parallel Resistor Calculator to find total resistance in series-free parallel circuits. Learn the formula, units, and quick examples.

Use a Resistance Calculator to compute resistance from voltage and current, or from resistivity, length, and area. Get instant results.

Use an Electric Flux calculator to compute electric flux through a surface using E, area, and angle. Includes unit handling and examples.

Use this Amps to Watts Calculator to convert current (amps) into electrical power (watts) for single-phase or three-phase systems.

Use this Watts to Amps Calculator to convert electrical power (watts) to current (amps) for single-phase and three-phase systems.