Your electricity bill might seem like a mystery every month — but the math behind it is actually straightforward. Once you understand how kilowatt-hours work, you can estimate the cost of any appliance, identify what's using the most power, and make smarter decisions about your energy use.
Enter your appliance wattage, daily usage hours, and local rate to get your monthly cost.
Calculate Bill →Your electricity provider charges you per kilowatt-hour (kWh). One kWh is the amount of energy consumed by a 1,000-watt appliance running for one hour. Your electricity meter tracks how many kWh you use each month.
Rate per kWh varies by country and provider — check your last bill
Monthly kWh = (1500 ÷ 1000) × 8 × 30 = 360 kWh
Monthly cost = 360 × $0.15 = $54/month
| Appliance | Typical Wattage | Monthly Cost (at $0.15/kWh, 8hr/day) |
|---|---|---|
| Air Conditioner | 1,000–3,500W | $36–$126 |
| Electric Heater | 1,500–2,000W | $54–$72 |
| Refrigerator | 100–400W (runs 24hr) | $11–$43 |
| Washing Machine | 500–1,000W | $18–$36 |
| LED TV (50") | 50–100W | $1.80–$3.60 |
| LED Bulb | 9–15W | $0.32–$0.54 |
| Laptop | 45–100W | $1.62–$3.60 |
Check your latest electricity bill — it shows your rate per kWh. Rates vary widely by country, region, and provider, typically ranging from $0.08 to $0.35 per kWh.
Air conditioning is typically the single largest electricity consumer in a home. A central AC unit running several hours a day can easily double your electricity bill compared to cooler months.
Heating and cooling typically account for 40-50% of home electricity use, followed by water heating (18%), appliances (15%), lighting (10%), and electronics (7%).
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