⚡ Electronics & Electrical Engineering Calculators
Design and analyse circuits: resistor and capacitor codes, Ohm's law, filters, resonance, timers, amplifiers, AC power and wiring. Results are rounded to sensible precision and standard E-series values are suggested where useful.
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- Ohm's Law CalculatorOhm's law and power calculator: enter any two of voltage, current, resistance and power to get the others.
- Resistor Color Code CalculatorDecode 4-band and 5-band resistor color codes into resistance, tolerance and min/max values.
- Resistance to Color Code ConverterFind the 4-band and 5-band color code for any resistor value and the nearest E12/E24 standard values.
- SMD Resistor Code CalculatorDecode 3-digit, 4-digit, R-notation and EIA-96 SMD resistor markings (e.g. 472, 1002, 4R7, 01C).
- Capacitor Code CalculatorDecode ceramic capacitor codes like 104, 223J or 4n7 into pF, nF and µF.
- Series & Parallel Resistor CalculatorTotal resistance of resistors in series and in parallel (also works for inductors).
- Series & Parallel Capacitor CalculatorTotal capacitance of capacitors connected in series and in parallel.
- Voltage Divider CalculatorOutput voltage, current and power of a resistive voltage divider, with optional load resistance.
- LED Series Resistor CalculatorCalculate the current-limiting resistor for one or more LEDs in series, its power rating and the nearest standard value.
- RC Circuit CalculatorRC time constant, low/high-pass cutoff frequency and charge times for a resistor–capacitor circuit.
- RL Circuit CalculatorTime constant and cutoff frequency of a resistor–inductor circuit.
- LC Resonant Frequency CalculatorResonant frequency of an LC tank circuit, characteristic impedance and wavelength.
- Capacitive & Inductive Reactance CalculatorReactance of a capacitor and an inductor at a given frequency.
- Series RLC Impedance CalculatorImpedance, phase angle, current and resonance of a series RLC circuit.
- 555 Timer Astable CalculatorFrequency, period, duty cycle and high/low times for a 555 timer in astable mode.
- Op-Amp Gain CalculatorGain and output voltage of inverting and non-inverting operational amplifier circuits.
- DecibelConvert power or voltage ratios to decibels and back; also dBm ↔ watts.
- AC Power CalculatorReal power (W), reactive power (VAR) and apparent power (VA) for single- and three-phase AC circuits.
- AC Voltage ConverterConvert a sinusoidal voltage between peak, peak-to-peak, RMS and average values.
- Wire Resistance & Voltage Drop CalculatorResistance and voltage drop of a wire from its material, length and cross-section.
- AWG Wire Gauge CalculatorConvert American Wire Gauge (AWG) to diameter, cross-section area and copper resistance per km.
- Battery Life CalculatorEstimate how long a battery lasts from its capacity, the load current and efficiency.
- Capacitor Charge & Energy CalculatorStored charge and energy of a capacitor at a given voltage.
- Transformer Turns Ratio CalculatorIdeal transformer secondary voltage and current from turns ratio, primary voltage and current.
- Electricity Consumption & Cost CalculatorEnergy use and cost of an appliance from its power, daily usage and electricity price.