ELECTRICAL · OHM'S LAW
Ohm's law calculator
Solve voltage, current, resistance, and power from any valid pair of known values.
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Electrical & Science calculators
Browse the live electrical and science calculators for Ohm's law, voltage drop, wire gauge, power math, resistor codes, density, and molecular weight.
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Live Electrical & Science calculators
10 live calculators currently grouped in this category.
ELECTRICAL · VOLTAGE DROP
Voltage drop calculator
Estimate circuit voltage drop and percent drop from AWG size, run length, current, and conductor material.
ELECTRICAL · RESISTORS
Resistor calculator
Decode 4-band and 5-band resistor color codes into resistance and tolerance.
ELECTRICAL · ENERGY COST
Electricity bill calculator
Estimate a monthly electricity bill from average daily kWh or watts and runtime.
ELECTRICAL · POWER FACTOR
Power factor calculator
Calculate power factor and reactive power from real power and apparent power inputs.
ELECTRICAL · WIRE SIZING
Wire gauge calculator
Screen AWG sizes against a target voltage-drop percentage.
ELECTRICAL · POWER
Amps to watts calculator
Convert amps to watts for DC, single-phase AC, and three-phase AC systems.
ELECTRICAL · CURRENT
Watts to amps calculator
Convert watts to amps for DC, single-phase AC, and three-phase AC systems.
SCIENCE · DENSITY
Density calculator
Calculate density from mass and volume with unit conversions.
SCIENCE · MOLAR MASS
Molecular weight calculator
Parse a chemical formula and sum the element masses into a molar mass.