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Electrical Calculator

Calculate voltage, current, resistance, and power using Ohm's Law. Estimate energy usage in kWh and electricity cost per device.

Quick Answer

An electrical calculator uses Ohm's Law and power equations to calculate voltage, current, resistance, watts, energy usage, and electricity cost.

Enter any two values — the calculator will solve for the third.

Electrical Formulas

Ohm's Law: V = I × R Power: P = V × I = I² × R = V² / R Energy: E (kWh) = P (W) × t (h) / 1000 Cost: Cost = kWh × rate per kWh Where: V = Voltage (volts) I = Current (amps) R = Resistance (ohms) P = Power (watts)

How to Use This Calculator

  1. 1

    Select a calculation mode: Ohm's Law, Power, or Energy Cost.

  2. 2

    For Ohm's Law or Power: enter any two known values. The calculator solves for the rest.

  3. 3

    For Energy Cost: enter device wattage, hours of use, and your rate per kWh.

  4. 4

    Click Calculate to see all computed values.

Frequently Asked Questions

Ohm's Law states that Voltage = Current × Resistance (V = I × R). Knowing any two values allows you to calculate the third.

This calculator is for general estimates only. Electrical work should be performed by qualified professionals and must comply with local electrical codes and safety standards.

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Last updated: June 2026