Watts to Kilowatts and Amps Conversion
Quick Answer
- Watts to kilowatts: kW = W ÷ 1,000
- Kilowatts to watts: W = kW × 1,000
- Watts to amps (DC): A = W ÷ V
- Watts to amps (AC): A = W ÷ (V × PF) where PF = power factor (typically 0.8 to 1.0)
Examples: 2,000 W = 2 kW | 100 W at 230 V: Amps = 100 ÷ 230 = 0.43 A | 3,000 W at 120 V: Amps = 3,000 ÷ 120 = 25 A
Understanding watts, kilowatts and amps is essential for sizing fuses and circuit breakers, understanding your electricity bill, comparing appliance power ratings and planning solar panels or generators. Use the free Electricity Converters on CalConvs for instant results.
Watts and Kilowatts: The Basic Relationship
| Unit | Equivalent |
|---|---|
| 1 kilowatt (kW) | 1,000 watts (W) |
| 1 megawatt (MW) | 1,000 kW = 1,000,000 W |
| 1 gigawatt (GW) | 1,000 MW = 1,000,000,000 W |
| 1 horsepower (hp) | 745.7 W = 0.7457 kW |
| 1 kilowatt-hour (kWh) | 1 kW running for 1 hour = 3,600,000 joules |
Watts to Amps Conversion
Power Triangle: Power (W) = Voltage (V) × Current (A) for DC circuits.
- Amps = Watts ÷ Volts
- Watts = Volts × Amps
- Volts = Watts ÷ Amps
For AC circuits with a power factor (PF): Watts = Volts × Amps × PF. Amps = Watts ÷ (Volts × PF). Typical power factor for home appliances: 0.95 to 1.0.
Common Appliance Power Ratings
| Appliance | Watts | Kilowatts |
|---|---|---|
| LED light bulb | 8 to 15 W | 0.008 to 0.015 kW |
| Laptop computer | 45 to 85 W | 0.045 to 0.085 kW |
| Refrigerator | 100 to 400 W | 0.1 to 0.4 kW |
| Microwave oven | 600 to 1,200 W | 0.6 to 1.2 kW |
| Electric kettle | 1,500 to 3,000 W | 1.5 to 3.0 kW |
| Hair dryer | 1,000 to 2,000 W | 1.0 to 2.0 kW |
| Washing machine | 500 to 2,000 W | 0.5 to 2.0 kW |
| Electric oven | 2,000 to 5,000 W | 2.0 to 5.0 kW |
| Electric shower (UK) | 7,500 to 10,500 W | 7.5 to 10.5 kW |
| Air conditioner | 1,000 to 3,500 W | 1.0 to 3.5 kW |
| Electric car charger (home) | 3,700 to 22,000 W | 3.7 to 22.0 kW |
Mains Voltage by Country
| Country | Mains Voltage | Amps for 1,000 W Appliance |
|---|---|---|
| United States and Canada | 120 V (60 Hz) | 1,000 ÷ 120 = 8.33 A |
| United Kingdom | 230 V (50 Hz) | 1,000 ÷ 230 = 4.35 A |
| Europe | 230 V (50 Hz) | 1,000 ÷ 230 = 4.35 A |
| Australia and New Zealand | 230 V (50 Hz) | 1,000 ÷ 230 = 4.35 A |
| India | 230 V (50 Hz) | 1,000 ÷ 230 = 4.35 A |
| Pakistan | 230 V (50 Hz) | 1,000 ÷ 230 = 4.35 A |
| Japan | 100 V (50/60 Hz) | 1,000 ÷ 100 = 10.0 A |
Frequently Asked Questions
How many amps is a 1,000-watt appliance?
At 230 V (UK, Europe, India, Pakistan, Australia): 1,000 ÷ 230 = 4.35 amps. At 120 V (US): 1,000 ÷ 120 = 8.33 amps. The same appliance draws more amps at lower voltage.
What is the difference between watts and kilowatts?
One kilowatt equals 1,000 watts. Watts measures the instantaneous rate of energy use. Kilowatts is simply a more convenient unit for larger amounts. Your electricity bill uses kilowatt-hours (kWh): the energy used by 1 kW running for 1 hour.
How do I convert watts to amps for a 230-volt circuit?
Amps = Watts ÷ Volts = Watts ÷ 230. For a 3,000-watt appliance on 230 V: 3,000 ÷ 230 = 13.04 amps.
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