Ohm's Law Calculator

• Ohm's Law calculator for real-time calculation of Voltage (V), Current (I), Resistance (R), and Power (P)
• Enter any two known parameters to automatically calculate the remaining values
• Supports unit conversion (mV, V, kV, mA, A, kA, mΩ, Ω, kΩ, MΩ, mW, W, kW)

1. Open the tool page — no installation needed
2. Enter any two known parameters among Voltage, Current, Resistance, and Power, and pick a unit for each (e.g. mV/V/kV, A/kA, mΩ/Ω/kΩ/MΩ, mW/W/kW)
3. Results are calculated and shown in real time; click "Copy" to grab them all

• This tool is completely free and requires no sign-up
• Everything runs locally in your browser — your data never leaves your device

Free online Ohm's Law calculator for real-time calculation of Voltage (V), Current (I), Resistance (R), and Power (P). Enter any two known parameters to automatically calculate the remaining values. Supports unit conversion (mV, V, kV, mA, A, kA, mΩ, Ω, kΩ, MΩ, mW, W, kW). Perfect for circuit design, electronic engineering, and physics learning.

Open the tool page — no installation needed Enter any two known parameters among Voltage, Current, Resistance, and Power, and pick a unit for each (e.g. mV/V/kV, A/kA, mΩ/Ω/kΩ/MΩ, mW/W/kW) Results are calculated and shown in real time; click "Copy" to grab them all

This tool is completely free and requires no sign-up Everything runs locally in your browser — your data never leaves your device

Yes, Ohm's Law Calculator is completely free. No download or installation required — it runs right in your browser.