General

Electricity Bill Calculator

An electricity bill calculator that estimates your monthly bill by adding up power consumption from all your appliances. Enter each device's wattage, daily hours of use, and your per-unit rate.

Cost per kWh (unit rate)

Check your electricity bill for this figure ($/kWh or $/unit)

Appliances

Monthly bill estimate

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Daily cost

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Annual cost

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Monthly kWh

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Per-appliance cost

Method

How this calculator works

Your electricity cost is the sum of each appliance's power consumption (watts × hours) converted to kWh, then multiplied by your per-unit tariff rate.

kWh per appliance = Watts ÷ 1000 × Hours/day × 30

Monthly bill = Σ(all appliances kWh) × Rate per kWh

Enter your cost per kWh from your electricity bill.
The calculator starts with 6 common appliances pre-filled.
Edit each appliance name, wattage, and daily hours of use.
Click "Add appliance" to add more devices.
See your estimated monthly bill, daily cost, annual cost, and per-appliance breakdown.

Examples

Worked examples

Real numbers, end-to-end results.

AC (1500W, 8h/d) + Fridge (150W, 24h/d) + TV (120W, 5h/d)

~420 kWh/month · $63/month at $0.15/kWh

Typical summer household in temperate climate.

Laptop (60W, 10h/d) + Lights (50W, 6h/d) + Phone charger (10W, 3h/d)

~28 kWh/month · $4.20/month

Small home office, no AC.

Use cases

When to use it

Identify which appliances are costing the most.
Estimate bill before moving to a new house.
Calculate savings from replacing an old appliance with a 5-star rated one.
Plan an off-grid solar system by knowing total consumption.

FAQ

Frequently asked questions

How is electricity bill calculated?

Your bill = Total kWh consumed × cost per unit. kWh for each appliance = Wattage (W) ÷ 1000 × hours used per day × days in billing period. Add up all appliances to get total consumption.

What is a kWh?

A kilowatt-hour (kWh) is the standard unit of electricity consumption. 1 kWh = 1,000 watts used for 1 hour. A 100W light bulb running for 10 hours uses 1 kWh.

How do I find my cost per unit?

Check your electricity bill — it usually shows cost per kWh or cost per unit. In India it ranges from $3–$10/unit. In the UK it's around 24–30p/kWh. In the US it averages 12–15¢/kWh.

How can I reduce my electricity bill?

Switch to LED lighting (80% less power than incandescent). Use 5-star rated appliances. Run AC at 24°C instead of 18°C (saves 6% per degree). Unplug devices on standby. Run washing machines during off-peak hours.