Watt-seconds to Kilowatt-hours Conversion

Enter the energy in watt-seconds below to get the value converted to kilowatt-hours.

Results in Kilowatt-hours:
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1 Ws = 2.7778E-7 kWh
Hint: use a scientific notation calculator to convert E notation to decimal

How to Convert Watt-seconds to Kilowatt-hours

To convert a watt-second measurement to a kilowatt-hour measurement, divide the energy by the conversion ratio.

Since one kilowatt-hour is equal to 3,600,000 watt-seconds, you can use this simple formula to convert:

kilowatt-hours = watt-seconds ÷ 3,600,000

The energy in kilowatt-hours is equal to the watt-seconds divided by 3,600,000.

For example, here's how to convert 5,000,000 watt-seconds to kilowatt-hours using the formula above.
5,000,000 Ws = (5,000,000 ÷ 3,600,000) = 1.388889 kWh

Watt-seconds and kilowatt-hours are both units used to measure energy. Keep reading to learn more about each unit of measure.


The watt-second is a measure of electrical energy equal to one watt of power over a one second period. One watt-second is equal to 1/3,600 of a watt-hour or one joule.

Watt-seconds are usually abbreviated as Ws, although the formally adopted expression is W·s. The abbreviation W s is also sometimes used. For example, 1 watt-second can be written as 1 Ws, 1 W·s, or 1 W s.

In formal expressions, the centered dot (·) or space is used to separate units used to indicate multiplication in an expression and to avoid conflicting prefixes being misinterpreted as a unit symbol.[1]


A kilowatt-hour is a measure of electrical energy equal to one kilowatt, or 1,000 watts, of power over a one hour period. Kilowatt-hours are a measure of electrical work performed over a period of time, and are often used as a way of measuring energy usage by electric companies.

Kilowatt-hours are usually abbreviated as kWh, although the formally adopted expression is kW·h. The abbreviation kW h is also sometimes used. For example, 1 kilowatt-hour can be written as 1 kWh, 1 kW·h, or 1 kW h.

Watt-second to Kilowatt-hour Conversion Table

Watt-second measurements converted to kilowatt-hours
Watt-seconds Kilowatt-hours
1 Ws 0.00000027778 kWh
2 Ws 0.00000055556 kWh
3 Ws 0.00000083333 kWh
4 Ws 0.0000011111 kWh
5 Ws 0.0000013889 kWh
6 Ws 0.0000016667 kWh
7 Ws 0.0000019444 kWh
8 Ws 0.0000022222 kWh
9 Ws 0.0000025 kWh
10 Ws 0.0000027778 kWh
100 Ws 0.000027778 kWh
1,000 Ws 0.000278 kWh
10,000 Ws 0.002778 kWh
100,000 Ws 0.027778 kWh
1,000,000 Ws 0.277778 kWh
10,000,000 Ws 2.7778 kWh


  1. Bureau International des Poids et Mesures, The International System of Units (SI), 9th edition, 2019, https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf

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