Power Conversion: 1 kilowatt = 1000 watts | Essential for electrical power calculations

Watts to Kilowatts Converter

Accurate conversion between watts (W) and kilowatts (kW) for electrical power measurements. Ideal for home energy use, industrial applications, and renewable energy calculations.

1 kW = 1000 W | Default: 2 decimal places

Conversion Factor

1 kilowatt (kW) = 1000 watts (W) | 1 watt = 0.001 kilowatts

W
kW

Precision: 2 Decimal Places | Formula: kW = W × 0.001

Common Power Measurements

Watts and Kilowatts

Understanding these essential units for electrical power measurement and energy consumption calculations.

The Conversion Formula

Watt to Kilowatt Conversion

1 kilowatt (kW) = 1000 watts (W)
1 watt (W) = 0.001 kilowatts (kW)
Kilowatts = Watts × 0.001
Watts = Kilowatts × 1000

Example Calculation 1:

Convert 1500 watts to kilowatts:

kW = W × 0.001

kW = 1500 × 0.001

kW = 1.5 (with 1 decimal place)

Example Calculation 2:

Convert 2.25 kilowatts to watts:

W = kW × 1000

W = 2.25 × 1000

W = 2250 (with 0 decimal places)

Note: These conversions follow the International System of Units (SI) for power measurement

When to Use This Conversion:

  • Calculating electricity bills and energy consumption
  • Understanding appliance power ratings
  • Renewable energy system sizing (solar panels, wind turbines)
  • Industrial machinery power requirements
  • Electrical system design and load calculations
  • Comparing energy efficiency of devices

About the Units

Watt (W)

The basic unit of power in the International System of Units (SI), named after James Watt. It measures the rate of energy transfer or consumption.

Equivalents:

  • 1 watt = 1 joule per second (J/s)
  • 1 watt = 0.001 kilowatts (kW)
  • 1000 watts = 1 kilowatt (kW)
  • 1 watt ≈ 0.00134 horsepower (hp)
  • 1 megawatt (MW) = 1,000,000 watts
  • 1 gigawatt (GW) = 1,000,000,000 watts

Common uses: Small appliances, light bulbs, electronics

Kilowatt (kW)

A unit of power equal to 1000 watts, commonly used for measuring the power consumption of larger appliances, industrial equipment, and electrical systems.

Equivalents:

  • 1 kilowatt = 1000 watts (W)
  • 1 kilowatt = 1.341 horsepower (hp)
  • 1 kilowatt-hour (kWh) = 1 kW used for 1 hour
  • 1 megawatt (MW) = 1000 kilowatts
  • 1 kilowatt = 1000 joules per second
  • 1 kilowatt = 859.845 BTU per hour

Common uses: Household power, electric vehicles, solar systems

Common Power Measurement Equivalents:

Watts (W) Kilowatts (kW) Megawatts (MW) Horsepower (hp) Common Applications
100 W 0.1 kW 0.0001 MW 0.134 hp Light bulb, small fan
500 W 0.5 kW 0.0005 MW 0.67 hp Microwave, laptop charger
1000 W 1 kW 0.001 MW 1.34 hp Electric kettle, toaster
1500 W 1.5 kW 0.0015 MW 2.01 hp Space heater, hair dryer
3500 W 3.5 kW 0.0035 MW 4.69 hp Electric stove, washing machine
10,000 W 10 kW 0.01 MW 13.41 hp Household solar system

Frequently Asked Questions

Common questions about watts, kilowatts, and electrical power measurements.

There are exactly 1000 watts in one kilowatt. This is a standard SI unit conversion for electrical power:

1 kilowatt (kW) = 1000 watts (W)

1 watt (W) = 0.001 kilowatts (kW)

Kilowatts to Watts: W = kW × 1000

Watts to Kilowatts: kW = W × 0.001

This conversion factor is consistent worldwide and forms the basis for all electrical power measurements in homes, businesses, and industrial applications.

Watts (W) and kilowatt-hours (kWh) measure different aspects of electricity:

Watts (W) / Kilowatts (kW)
  • Measure power (rate of energy use)
  • Instantaneous measurement
  • Indicates how much electricity a device uses at any moment
  • 1 kW = 1000 watts of power
  • Used for appliance ratings (e.g., 1500W heater)
Kilowatt-hours (kWh)
  • Measure energy (total consumption over time)
  • Integrated measurement (power × time)
  • 1 kWh = 1 kW used continuously for 1 hour
  • Used for electricity billing and energy tracking
  • Example: 100W bulb used for 10 hours = 1 kWh

In simple terms: Watts measure how fast you use electricity, while kilowatt-hours measure how much you use in total.

To calculate power consumption and estimated costs for household appliances, follow these steps:

  1. Find the wattage rating of the appliance (usually on a label or in the manual)
  2. Convert watts to kilowatts: kW = W × 0.001
  3. Multiply by hours of use per day: kWh/day = kW × hours used
  4. Multiply by days per month: kWh/month = kWh/day × days used
  5. Multiply by your electricity rate ($/kWh) to find monthly cost

Example: 1500W space heater used 4 hours/day

1500W = 1.5 kW

1.5 kW × 4 hours = 6 kWh/day

6 kWh × 30 days = 180 kWh/month

180 kWh × $0.15/kWh = $27.00/month

This calculation helps with energy efficiency comparisons and budgeting for electricity costs.

Here are typical power ratings (in watts) for common household appliances:

Low Power (0-500W)
  • LED light bulb: 5-15W
  • Ceiling fan: 20-75W
  • Laptop: 40-80W
  • TV (LED): 50-150W
  • Refrigerator (running): 100-200W
  • Phone charger: 5-20W
High Power (500W+)
  • Microwave: 600-1200W
  • Toaster: 800-1500W
  • Electric kettle: 1000-2000W
  • Space heater: 1000-1500W
  • Washing machine: 500-1500W
  • Electric stove: 1000-3500W per burner
  • Air conditioner: 1000-5000W

Note: These are approximate values. Actual power consumption varies by model, age, and usage patterns. Always check the manufacturer's specifications for precise ratings.

Watts and kilowatts are fundamental to designing and sizing renewable energy systems like solar panels and wind turbines:

  • Solar panel ratings: Individual solar panels are rated in watts (typically 300-400W per panel)
  • System size: Total solar system capacity is measured in kilowatts (e.g., 5kW, 10kW systems)
  • Energy production: Measured in kilowatt-hours (kWh) per day/month/year
  • Battery storage: Rated in kilowatt-hours (kWh) for capacity, kilowatts (kW) for discharge rate
  • Grid feed-in: Excess power fed to the grid is measured in kilowatts

Example: 10 solar panels × 350W = 3500W = 3.5kW system

3.5kW system × 5 hours of sunlight = 17.5 kWh/day production

17.5 kWh × 30 days = 525 kWh/month production

Understanding these conversions is essential for properly sizing renewable energy systems to meet household or business power needs.

Conversion Table: Watts to Kilowatts

Common power measurements for household, commercial, and industrial applications.

Watts (W) Kilowatts (kW) Megawatts (MW) Gigawatts (GW) Common Applications
100 W 0.1 kW 0.0001 MW 0.0000001 GW Lighting, small electronics
500 W 0.5 kW 0.0005 MW 0.0000005 GW Small appliances, laptops
1,000 W 1 kW 0.001 MW 0.000001 GW Kettles, toasters, small heaters
1,500 W 1.5 kW 0.0015 MW 0.0000015 GW Space heaters, hair dryers
3,500 W 3.5 kW 0.0035 MW 0.0000035 GW Electric stoves, washing machines
10,000 W 10 kW 0.01 MW 0.00001 GW Home solar systems, EV chargers
1,000,000 W 1,000 kW 1 MW 0.001 GW Small power plants, large factories
1,000,000,000 W 1,000,000 kW 1,000 MW 1 GW Large power stations, city grids

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