Electricity Calculator

Calculate power, voltage, current, resistance, energy, and cost using Ohm's law. Get step-by-step solutions with interactive charts.

Calculate

Select a calculation type, enter your values, and click Calculate to see results with step-by-step solutions.

Complete User Guide

What is This Calculator?

This electricity calculator uses Ohm's law and power formulas to calculate power, voltage, current, resistance, energy consumption, and electricity cost. It is designed for electrical engineers, students, electricians, and anyone working with electrical circuits.

Ohm's Law & Power Formulas

V = I × R  |  P = V × I  |  P = V² / R  |  P = I² × R

E = P × t  |  Cost = E × Rate

6 Calculation Types

Power

P = V × I, P = V² / R, P = I² × R

Voltage

V = P / I, V = I × R, V = √(P × R)

Current

I = P / V, I = V / R, I = √(P / R)

Resistance

R = V / I, R = V² / P, R = P / I²

Energy

E = P × t (supports seconds, minutes, hours, days)

Cost

Cost = Energy × Rate per kWh

How to Use

  1. Select a calculation type (Power, Voltage, Current, Resistance, Energy, or Cost).
  2. Choose the formula method based on the values you know.
  3. Enter your values and select appropriate units.
  4. Click Calculate to get results with step-by-step solutions and charts.

Important Notes

  • All input values must be positive numbers.
  • Resistance and divisor values must be greater than zero.
  • Unit conversions are handled automatically.

📤 Share This Tool