Electricity Cost Calculator

Estimate electricity cost from watts, hours of use, and your kWh rate.

Electricity Cost Calculator helps you estimate the cost of running an appliance from wattage, hours, and rate. Enter power, hours per day, days, and price per kwh, review the breakdown, and use the guidance below to understand what the number means — and what it does not. What the Electricity calculator does Electricity Cost Calculator is built for everyday questions — shopping, home, travel, hobbies, and tech. Estimate the cost of running an appliance from wattage, hours, and rate. You enter power, hours per day, days, and price per kwh, then Simple Calculators computes the result instantly. Defaults are chosen to be easy to read — change any field to match your situation. How the math works kWh = watts × hours / 1000. Cost = kWh × rate. Optional days multiply hours. The formula: Cost = watts × hours ÷ 1,000 × price per kilowatt-hour. Watts × hours ÷ 1,000 gives kilowatt-hours (kWh), the unit on your bill.