Energy Conversion
Convert units of energy
Features
Supports over 50 units
Covers joules, calories, Wh, BTU, and more
Convert to all units at once from one input
Just enter a value to list all the other units
Handles tiny to enormous units
Supports everything from electronvolts to tons of TNT equivalent
One-click copy of results
Get each converted value instantly with the copy button
How to use
Select the base unit
Choose the source unit from the base unit list
Enter the value to convert
Enter a number in the value field to start the conversion instantly
Review and copy the conversion results
Review the converted values for all other units in a list and copy them
Use cases
Estimating electricity costs
Convert kWh and joules to grasp power consumption
Aiding nutritional calculations
Convert calories and kilojoules to check intake
Understanding units in physics study
Mutually convert academic units such as electronvolts and ergs
Unifying units in technical documents
Align BTU and therms to the International System of Units when writing
Basic Knowledge
Relationship Between Calories and Joules
Joule (J) is the unit of energy in the International System of Units. One calorie is defined as 4.184 joules. Food "calories" are technically kilocalories (kcal), where 1 kcal equals 1,000 cal.
What is kWh (Kilowatt-hour)
kWh is the amount of energy consumed when 1 kW of power is used continuously for 1 hour. It is used as the unit for calculating electricity charges. In joules, 1 kWh equals 3.6 million J.
Safety and privacy
Runs entirely in your browser
Your input data is processed only within your browser and is never sent externally.
Processing only in your browser
the unit conversion is processed entirely within your browser, and input data is not sent to any server.
Communications encrypted with HTTPS
Page loading is also encrypted by TLS, and content cannot be read by third parties.
No transmission to third parties
Input content is not sent to external services such as ad networks or trackers.
No automatic saving of results
the input value and conversion results and input suggestions are not stored on the server.
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RAKKOTOOLS is free to use!
Available free of charge for individuals and corporations, commercial and non-commercial use alike.No prior permission or usage application is required. Feel free to use it in various situations.
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Can be used for commercial purposes such as research, calculation, processing, and conversion in business and production.
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If using in streaming and videos
Link to RAKKOTOOLS in the description, or Mention or display that you are using RAKKOTOOLS in the stream or video.
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Usage guidelinesYou are free to use it for normal purposes. However, use for purposes that violate laws, infringe on third-party rights, impose significant load on the service, or otherwise interfere with service operation is prohibited.
We do not guarantee the accuracy or completeness of information and calculation results obtained from each tool.
This notice is a translation of the original Japanese text. If there is any discrepancy between the translation and the original, the Japanese original takes precedence.