What this tool does
Convert watt-seconds (W·s) to joules, kilowatt-hours, BTUs, calories, foot-pounds, and more energy units. Type an amount in watt-seconds, choose the units, and the tool converts it to joules. It offers 12 energy units and also shows the same amount in the others.
Inputs
- Value: A number.
- From: Choose one from 12 options, including Watt-second, Joule, Kilojoule, Megajoule, Watt-hour, Kilowatt-hour. Starts as Watt-second.
- To: Choose one of the same 12 units as "From". Starts as Joule.
How to use
- Enter the amount you want to convert.
- Choose the unit to convert from and the unit to convert to.
- Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.
Worked examples
Watt-seconds and joules are the same size, so the number does not change: an amount in watt-seconds is the same amount in joules.
Sources: Watt-second: exact by definition. Joule: SI Brochure, 9th edition (2019).
Limitations
- Converts units of energy only. It does not work out energy from power, time, voltage or charge.
FAQs
- Q: How many joules are in one watt-second?
- A: One watt-second is exactly 1 joule. Change the value to convert any amount; the other units are listed below the result.
- Q: Which definition of the units does this page use?
- A: A watt-second is exactly one joule. Calories here are thermochemical calories (1 cal = 4.184 J exactly), the definition commonly used in chemistry and nutrition. The International Table calorie (4.1868 J) is slightly larger. BTU here is the International Table BTU (about 1055.06 J), the usual definition for heating and cooling. The thermochemical BTU is slightly smaller.
- Q: Can I convert from joules to watt-seconds?
- A: Yes. Choose joule in the From box and watt-second in the To box. One joule is 1 watt-second.
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