5 Professional Tools

Basic Circuit Calculators — Ohm's Law, Dividers & Power

Circuit calculator hub: parallel & series resistor total R, capacitor RC discharge time, dBm to watts & Ohm's law. Step-by-step DC & RF formulas.

Quick Answer

Ohm's Law: V = I × R. Voltage divider: Vout = Vin × R2/(R1+R2). Power: P = V × I. These three relationships solve most bench-level DC problems.

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Amps to Watts Calculator

P = I × V — convert amps to watts and back

Volts to Amps Calculator

I = P / V, plus VA to amps for 1- and 3-phase

Ohm's Law Calculator

Solve V, I, R or P after you know total resistance

Parallel & Series Resistor Calculator

Combine R values — product-over-sum & mixed layouts

Solve voltage, current, resistance, or power

Loaded and unloaded divider output voltage

Branch current for 2+ parallel resistors

Calculate watts, voltage, current, or resistance

Convert amps, watts, volts, and VA