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Electricity Cost Calculator

Calculate electricity consumption and costs for appliances — daily, monthly, and yearly estimates.

Electricity Rate

Currency

Rate per kWh (₹)

Appliance Details

Power Rating (Watts)

Usage Hours per Day

Number of Days

How Electricity Cost is Calculated

Energy (kWh) = Power (W) x Time (hrs) / 1000

Cost = Energy (kWh) x Rate per kWh

kWh (kilowatt-hour) is the standard unit of electricity consumption
A 100W bulb running for 10 hours consumes 1 kWh
Your electricity bill is based on total kWh consumed during the billing period
Rates vary by region and may include tiered/slab pricing for higher usage

About Electricity Cost Calculator

Free electricity cost calculator that estimates how much your appliances cost to run. Enter the power rating (watts), usage hours, and your electricity rate to instantly see daily, monthly, and yearly energy consumption in kWh and costs in your currency. Switch to Bill Estimator mode to add multiple appliances — choose from common presets like fans, ACs, LEDs, TVs, and refrigerators — and get a complete monthly electricity bill estimate. Supports multiple currencies (₹, $, €, £). Perfect for reducing energy bills, comparing appliance efficiency, or planning solar installations. 100% browser-based, no signup required.

Frequently Asked Questions

How is electricity cost calculated?▾

Electricity cost is calculated using the formula: Cost = (Watts × Hours per day × Days) ÷ 1000 × Rate per kWh. The wattage is divided by 1000 to convert from watts to kilowatts, then multiplied by usage time and your electricity rate. For example, a 1500W AC running 8 hours/day at ₹8/kWh costs ₹360 per day.

What is a kWh?▾

A kilowatt-hour (kWh) is the standard unit of electrical energy. It represents one kilowatt (1000 watts) of power used for one hour. Your electricity bill is measured in kWh. For example, a 100W light bulb running for 10 hours uses 1 kWh.

How do I find my appliance's wattage?▾

Check the label on the appliance — it usually shows watts (W) or amps (A). If only amps are shown, multiply by your voltage (typically 220V in India, 120V in the US) to get watts. You can also check the appliance manual or search online for the model's power rating.

What is the average electricity rate?▾

Electricity rates vary by country and provider. In India, residential rates are typically ₹4-₹10 per kWh depending on the state and slab. In the US, the average is about $0.16/kWh. In the UK, it's approximately £0.28/kWh. Enter your actual rate from your electricity bill for accurate results.

How can I reduce my electricity bill?▾

Key strategies: switch to LED bulbs (10W vs 60W incandescent), use 5-star rated appliances, set AC to 24°C, use fans instead of AC when possible, turn off appliances when not in use (avoid standby power), and run heavy appliances during off-peak hours if your provider offers time-of-use pricing.

Is this calculator free?▾

Yes, completely free with no signup required. All calculations happen in your browser — no data is sent to any server.