Electrical & Electronics Calculators | Pevlika
Electronics and electrical calculators for hobbyists, students and engineers. For learning and prototyping — not a substitute for code-compliant professional design.
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Ohm’s Law CalculatorVoltage, current, resistance and power from any two values.
Voltage Divider CalculatorOutput voltage of a resistor divider — or the resistor you need.
Current Divider CalculatorHow current splits between parallel resistors.
Electrical Power CalculatorConvert watts ↔ amps for DC, single-phase and three-phase AC.
Electricity Cost CalculatorRunning cost of an appliance per day, month and year.
Resistor Color Code CalculatorDecode 4-, 5- and 6-band resistor colour codes.
Series & Parallel Resistance CalculatorTotal resistance of resistors in series or parallel.
LED Resistor CalculatorCurrent-limiting resistor for one or more LEDs.
Capacitor Charge & Energy CalculatorCharge and energy stored in a capacitor.
RC Time Constant Calculatorτ = RC and capacitor voltage while charging or discharging.
Capacitor Code DecoderDecode capacitor markings like 104K or 2A472J.
SMD Resistor Code DecoderDecode 3-digit, 4-digit, R-notation and EIA-96 SMD markings.
Reactance CalculatorInductive and capacitive reactance at any frequency.
LC Resonance CalculatorResonant frequency of an LC tank circuit, with Q.
Filter Cutoff Frequency Calculator−3 dB cutoff frequency of first-order RC and RL filters.
Battery Life CalculatorHow long a battery lasts at a given load.
Amp-Hour to Watt-Hour ConverterConvert Ah, mAh and Wh for batteries and power banks.
Voltage Drop CalculatorVoltage drop along copper or aluminium cable.
Transformer Turns Ratio CalculatorVoltages, turns and currents of an ideal transformer.
Power Factor CalculatorPower factor, kvar and correction capacitor size.
555 Timer CalculatorFrequency and duty cycle (astable) or pulse width (monostable).
Op-Amp Gain CalculatorGain of inverting and non-inverting op-amp amplifiers.
Star–Delta ConverterConvert resistor networks between star (Y) and delta (Δ).
PCB Trace Width CalculatorMinimum PCB trace width for a current (IPC-2221).