Electricity Calculator
Estimate Electricity by entering power ratings and usage hours. Get daily, monthly, and annual energy figures alongside cost and emissions estimates.
Formula
Cost = (W × h / 1000) × Rate
Convert watts to kilowatts, multiply by hours, then by rate.
Worked Examples
Example 1: 60W Bulb
Problem:5 hours at $0.12
Solution:0.06 kW * 5 * 0.12
Result:$0.036
Frequently Asked Questions
How to calculate electricity cost?
Cost = (Watts × Hours / 1000) × Cost per kWh.
How can I estimate my monthly electricity costs?
Find each appliance's wattage, multiply by hours used per day, divide by 1,000 to get kilowatt-hours, then multiply by your rate (US average is about $0.16/kWh). Major consumers are HVAC (40-50%), water heaters (14%), and appliances (13%). Smart thermostats can cut heating/cooling costs 10-15%.