Electronics Calculators

Quickly calculate Voltage, Current, Resistance, Capacitance, Power, and more.

Ohm's Law (V = I × R)

Voltage (V) Current (I)

A mA µA

Resistance (R)

Ω kΩ MΩ

Calculate Reset

Leave exactly one field blank to calculate it. Do not fill all three.

Voltage Divider

Input Voltage (V_in) Resistance R1 (Ω) Resistance R2 (Ω)

Calculate Reset

Series / Parallel Resistors

Resistors (comma separated) Connection Type Series Parallel

Calculate Reset

Capacitor (C = Q / V) & Reactance

Capacitance (C)

F mF µF nF pF

Voltage (V) Charge (Q)

C mC µC

Frequency (Hz) for Reactance

Calculate Reset

Provide exactly two of C, Q, V to calculate the third. For Xc, provide C and frequency only.

Power (P = V × I)

Voltage (V) Current (I)

Calculate Reset

Both voltage and current are required to calculate power.

RC Time Constant (τ = R × C)

Resistance (R) Capacitance (C)

Calculate Reset