Electricity Unit Calculator — kWh and Cost
Calculate electricity consumption in kWh and cost for any appliance. Enter wattage, hours/day, and tariff rate.
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hrs
days
Common appliances:
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Typical Appliance Wattages
| Appliance | Wattage | Typical Daily Use |
|---|---|---|
| Air Conditioner (1HP) | 746–1,000W | 6–12 hrs |
| Air Conditioner (1.5HP) | 1,119–1,500W | 6–12 hrs |
| Electric Iron | 1,000–2,000W | 1–2 hrs |
| Refrigerator | 100–250W | 24 hrs |
| Ceiling Fan | 60–90W | 8–16 hrs |
| LED Bulb | 5–15W | 6–12 hrs |
| Television (32") | 40–80W | 4–8 hrs |
| Laptop | 45–90W | 4–10 hrs |
| Water Pump | 370–750W | 1–3 hrs |
| Microwave | 700–1,200W | 0.5–1 hr |
Frequently Asked Questions
What is a kilowatt-hour (kWh)?
A kilowatt-hour (kWh) is the energy used by a 1,000W appliance running for 1 hour. Formula: kWh = Watts ÷ 1000 × hours. This is the unit on your electricity bill.
How do I calculate my appliance cost?
Multiply the appliance wattage (W) by hours used per day, then by number of days, then divide by 1000 to get kWh. Multiply kWh by your tariff rate to get cost.
What is the current electricity tariff in Nigeria?
NERC tariff rates vary by band: Band A = ₦225/kWh, Band B = ₦63/kWh, Band C = ₦50/kWh, Band D = ₦40/kWh, Band E = ₦30/kWh. Band depends on your daily hours of supply.
What uses the most electricity at home?
The biggest consumers in Nigerian homes are: Air conditioner (1,000–2,000W), Electric iron (1,000W), Water heater (1,500–3,000W), Refrigerator (100–200W continuous), and Water pump (370–750W).
How much does a generator cost to run vs grid?
At ₦1,200/litre diesel and 0.4 L/kWh consumption, a generator costs about ₦480/kWh — over twice Band A grid rate. Generator use for 4 hours a day costs significantly more than grid electricity.