Ohm's Law Calculator (Solve Voltage, Current, Resistance, Power)

Inputs

Voltage

Use mV for sensor rails and kV for high-voltage systems.

Current

Instrumentation loops often run in µA or mA, power stages in amps.

Resistance

Select milliohms for shunts, kiloohms or megaohms for bias networks.

Power

Portable gear typically uses mW, motors and heaters use watts or kW.

The calculator picks the appropriate formula set for the pair you provide and verifies consistency against Ohm's law.

V = I × R
P = V × I
I = P ÷ V
R = V ÷ I
I = √(P ÷ R)

This tool is for rapid estimation and learning. Always validate designs with lab measurements and relevant safety standards.

Which unit should I pick?

Pick mA or µA for tiny currents and kΩ or MΩ for large resistances. Results always follow the units you choose.

What if the numbers disagree with the result?

If any inputs contradict Ohm's law the calculator flags an error. Double-check the values when the mismatch is larger than rounding tolerance.

Can I rely on this for safety sign-off?

This tool is for rapid estimation and education. It does not replace safety standards, hardware validation, or professional review.

Pundasyong pormula: V = I·R at P = V·I. Kapag may dalawang value, direktang nalalabas ang dalawa pang value.
Kung lampas ~0.5% ang di‑pagkakatugma, may babala para i-check ang mga value at unit.
Base units ang gamit (V/A/Ω/W); ang mga prefix ay para sa parsing at display lamang.