Electricity Cost Calculator
Estimate your appliance electricity costs. Enter power (watts), daily usage hours, and rate per kWh to calculate daily, monthly, and yearly energy bills.
About This Calculator
The Electricity Cost Calculator helps you estimate how much your appliances cost to run. Whether you are budgeting for household expenses, comparing appliance efficiency, or planning energy savings, this tool provides accurate cost estimates based on your local electricity rates.
The calculation follows the standard formula: Cost = (Power in watts × Usage time in hours ÷ 1000) × Electricity rate per kWh. For example, running a 1500W air conditioner for 8 hours daily at ₹8/kWh costs (1500 × 8 ÷ 1000) × 8 = ₹96 per day, ₹2,880 per month, and ₹35,064 annually.
The calculator provides daily, monthly, and annual cost estimates along with energy consumption in kilowatt-hours. The comparison chart visualizes costs across time periods, while the yearly view shows cumulative costs over 12 months. Use the breakdown table to see detailed kWh consumption and cost for each period.
Regional Notes
India: Electricity rates range from ₹6–₹10/kWh depending on the state and consumption slab. The default rate is ₹8/kWh. Many states offer subsidized rates for lower consumption brackets.
US: Average residential rates are ~$0.14/kWh (2025). Rates vary by state from $0.11/kWh (Louisiana) to $0.44/kWh (Hawaii). Some utilities use time-of-use pricing with lower off-peak rates.
UK: Average rates are ~£0.28/kWh under the Energy Price Guarantee. Standing charges add a fixed daily cost regardless of usage. Consider Economy 7 tariffs for cheaper overnight electricity.
Frequently Asked Questions
How is electricity cost calculated?
Electricity cost is calculated as: Cost = (Power in watts × Usage time in hours / 1000) × Electricity rate per kWh. For example, a 1000W appliance used 6 hours daily at ₹8/kWh costs (1000 × 6 / 1000) × 8 = ₹48 per day, ₹1,440 per month, and approximately ₹17,532 per year.
What is the average electricity rate in India?
The average residential electricity rate in India ranges from ₹6 to ₹10 per kWh depending on the state, with the national average around ₹8 per kWh. Rates vary by slab — lower for basic consumption and higher for higher usage tiers.
What is the average electricity rate in the US?
The average residential electricity rate in the United States is approximately $0.14 per kWh as of 2025, though rates vary significantly by state. Hawaii has the highest rates (~$0.44/kWh) while states like Louisiana and Oklahoma have lower rates (~$0.11/kWh).
What is the average electricity rate in the UK?
The average residential electricity rate in the UK is approximately £0.28 per kWh under the Energy Price Guarantee (as of 2025). Rates include standing charges and vary by supplier and payment method.
How can I reduce my electricity bill?
To reduce electricity costs: switch to LED bulbs (use 80% less energy), unplug devices on standby, use energy-efficient appliances with 5-star BEE ratings (India) or Energy Star ratings (US), run appliances during off-peak hours if on time-of-use tariffs, and consider solar panels for long-term savings.
How many watts do common household appliances use?
Typical appliance wattages: LED bulb 10W, ceiling fan 75W, refrigerator 150W, washing machine 500W, microwave 1000W, air conditioner 1500W, heater 2000W, water pump 750W, television 100W, laptop charger 65W, and iron box 1200W. Always check the rating plate on your specific appliance.
What is the difference between watts and kilowatt-hours?
Watts (W) measure power — the rate of energy consumption at an instant. Kilowatt-hours (kWh) measure energy — the total amount of electricity used over time. 1 kWh equals using 1000 watts for 1 hour. Your electricity bill charges you for kWh consumed, not watts.
Is this electricity cost calculator free to use?
Yes, this electricity cost calculator on Calculy is completely free to use with no limitations. You can calculate costs for any appliance, save results via shareable URL links, and toggle between chart views to visualize your energy expenses.