Electricity and electronics
Electricity consumptionEstimate energy use in kWh from power and usage time.
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Calculators forElectricity and electronics
Calculate electrical and electronic quantities related to voltage, current, resistance, power, batteries, motors, and circuits.
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Electricity consumption
Estimate energy use in kWh from power and usage time.
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Electrical power
Calculate power from voltage and current.
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Ohmโs law
Calculate voltage, current, or resistance.
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Three-phase power
Calculate active power in a balanced three-phase system.
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Electricity and electronics
Electrical powerCalculate power from voltage and current.
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Ohmโs lawCalculate voltage, current, or resistance.
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Three-phase powerCalculate active power in a balanced three-phase system.
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Coulombโs lawCalculate the electric force between two point charges.
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Electrical energyCalculate energy from power and time.
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Resistors in series and parallelCalculate the equivalent resistance of multiple resistors.
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Capacitance in series and parallelCalculate the equivalent capacitance of multiple capacitors.
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Voltage dividerCalculate output voltage from two resistors.
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Current dividerCalculate current division between two resistive branches.
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RC time constantCalculate ฯ = R ร C and reference charging times.
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RC frequencyCalculate the cutoff frequency of an RC filter.
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Capacitive reactanceCalculate Xc from frequency and capacitance.
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Inductive reactanceCalculate XL from frequency and inductance.
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Energy in a capacitorCalculate the energy and charge of an ideal capacitor.
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Energy stored in an inductorCalculate the energy stored in an inductor.
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Series RLC impedanceCalculate impedance, phase, and current in a series RLC circuit.
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RLC ResonanceCalculate resonant frequency from L and C.
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Apparent powerCalculate apparent, active, and reactive power.
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Power factorCalculate power factor from active and apparent power.
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Ideal transformerRelate voltage, current, and the number of turns.
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LED and resistorCalculate the series resistance and theoretical resistor power for LEDs.
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Battery runtimeEstimate ideal battery life from capacity and power consumption.
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Battery: energyCalculate Wh and usable energy from voltage and Ah.
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Battery chargeEstimate charging time from capacity and charging current.
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DC powerRelate voltage, current, power, and resistance in DC circuits.
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Voltage drop in a cableEstimate voltage drop from current, length, and cross-sectional area.
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AWG and diameter converterConvert AWG wire gauges to approximate diameter and cross-sectional area.
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Power decibelsConvert a power ratio to decibels and back.
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Voltage decibelsConvert a voltage ratio to decibels and back.
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dBm and wattsConvert power between dBm, mW and W.
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Amplifier gainCalculate linear gain and gain in dB.
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Signal-to-noise ratioCalculate SNR as a linear ratio and in decibels.
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555 astable timerCalculate frequency, timing, and duty cycle.
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Synchronous motor speedCalculate synchronous RPM from frequency and number of poles.
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Motor slipCalculate the slip percentage of an induction motor.
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Use these calculators for common tasks
1
Apply formulas for Ohmโs law and electrical power.
2
Work with resistance, RLC circuits and components.
3
Estimate values for batteries, motors, and electricity consumption.
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Frequently asked questions
About the calculators fromElectricity and electronics
Which calculators does Electricity and electronics include?
Ohmโs law, RLC circuits, batteries, motors, decibels, power, and circuits. You will currently find 36 tools in this category.
Are the calculators of Electricity and electronics free?
Yes. You can use the calculators available online without installing programs.
Do I need to create an account?
No. An account is optional. Signing in lets you save favorite tools and view your history.
Can I use these calculators on my phone?
Yes. The pages are designed to work on both phones and tablets and on computers.