Engineering calculator collection
Electrical Engineering Calculators
Free electrical calculators for voltage, current, resistance, power, capacitance and circuit analysis.
Ohm's Law — Voltage Calculator
Calculate voltage from current and resistance.
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Ohm's Law — Current Calculator
Calculate current from voltage and resistance.
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Ohm's Law — Resistance Calculator
Calculate resistance from voltage and current.
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Electrical Power Calculator
Calculate electrical power P = VI.
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Electrical Energy Calculator
Calculate electrical energy from power and time.
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Battery Energy Calculator
Estimate nominal battery energy from voltage and capacity.
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Battery Runtime Calculator
Ideal runtime from usable capacity and average current.
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Current from Power ÷ Voltage Calculator
Calculate electrical current from power and voltage.
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Resistance from Power & Current Calculator
Calculate resistance from P = I²R.
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Voltage Divider Calculator
Calculate the unloaded output voltage of a two-resistor voltage divider.
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Series Resistance Calculator
Equivalent resistance of three resistors connected in series.
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Parallel Resistance — Two Branches Calculator
Equivalent resistance of two resistors connected in parallel.
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RC Time Constant Calculator
Calculate the time constant τ = RC of a first-order resistor-capacitor circuit.
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Capacitor Stored Energy Calculator
Calculate energy stored in a capacitor at a given voltage.
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Resistive Heating Calculator
Calculate Joule heating power using P = I²R.
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Battery Current from C-Rate Calculator
Calculate current associated with a battery capacity and specified C-rate.
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