Kilowatt-hour to Watt-hour Converter

One Kilowatt-hour equals 1000 Watt-hour (1 kWh = 1000 Wh). Multiply a Kilowatt-hour value by 1000 to get the equivalent in Watt-hour. Use the calculator above for instant results, or follow the formula, worked examples, and reference table below.

Formula

Wh = kWh × 1000

Multiply the Kilowatt-hour value by 1000 to get the equivalent value in Watt-hour.

Example Conversions

1 Kilowatt-hour (kWh)

1000 Watt-hour (Wh)

5 Kilowatt-hour (kWh)

5000 Watt-hour (Wh)

10 Kilowatt-hour (kWh)

10000 Watt-hour (Wh)

25 Kilowatt-hour (kWh)

25000 Watt-hour (Wh)

100 Kilowatt-hour (kWh)

100000 Watt-hour (Wh)

Conversion Table

Common conversion values from Kilowatt-hour to Watt-hour
Kilowatt-hour (kWh) Watt-hour (Wh)
0.1 100
0.5 500
1 1000
2 2000
5 5000
10 10000
25 25000
50 50000
100 100000
250 250000
500 500000
1000 1000000

How to Convert Manually

Use these steps to convert Kilowatt-hour values to Watt-hour without the calculator.

  1. Write down the value in Kilowatt-hour (kWh) that you want to convert.
  2. Multiply that value by 1000.
  3. For example, 10 Kilowatt-hour × 1000 = 10000 Watt-hour.
  4. Label the result as Watt-hour (Wh).

Relative Size Comparison

1 Kilowatt-hour
1kWh
1 Watt-hour0.001Kilowatt-hours

This chart shows the visual difference in size between exactly one Kilowatt-hour and one Watt-hour.

About Kilowatt-hour and Watt-hour

The kilowatt-hour is exactly 3.6 megajoules — the unit on your electricity bill. Household consumption and electric vehicle battery sizes are stated in kilowatt-hours. The watt-hour is exactly 3,600 joules — one watt sustained for one hour. Battery capacities for phones, laptops, and e-bikes are rated in watt-hours. One Kilowatt-hour equals 1000 Watt-hour (1 kWh = 1000 Wh). Kilowatt-hour to Watt-hour conversion comes up most often in electricity billing and in electric vehicle battery capacity, typically when figures need restating for battery capacity ratings.

Precision and Rounding: Energy factors mix exact definitions (1 kWh = 3,600,000 J; 1 cal = 4.184 J thermochemical) with measured conventions (1 BTU ≈ 1,055.056 J). Nutrition and utility bills round to whole units; engineering heat calculations should keep the full factor until the final step.

Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).

Worked Example

15 Kilowatt-hour equals 15000 Watt-hour.

15 kWh × 1000 = 15000 Wh

FAQ

How do I convert Kilowatt-hour to Watt-hour?

Multiply the Kilowatt-hour value by 1000 to get the equivalent value in Watt-hour.

What is the formula for Kilowatt-hour to Watt-hour?

The formula is Wh = kWh × 1000.

How many Watt-hour are in 1 Kilowatt-hour?

1 Kilowatt-hour equals 1000 Watt-hour.

Can I convert Watt-hour back to Kilowatt-hour?

Yes. 1 Watt-hour equals 0.001 Kilowatt-hour, and the related converter can reverse the calculation.

What are common names for Kilowatt-hour and Watt-hour?

Kilowatt-hour is shown as kWh and may also be searched as kilowatt hour, kilowatt-hour, kwh. Watt-hour is shown as Wh and may also be searched as watt hour, watt-hour.

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