Energy Converter
Convert energy between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours and BTU. Great for physics homework, nutrition labels and electricity bills.
How to use the Energy Converter
- 1
Open the tool above — it is already running, no install or account needed.
- 2
Enter your input and adjust the options to match what you need.
- 3
Copy or download the result — everything was processed locally in your browser.
Private by design
This tool runs 100% inside your own browser using local JavaScript — your input never touches a server. That makes it instant, offline-capable in many cases, and private even for sensitive data.
Related tools
Speed Converter
km/h, mph, m/s, knots, mach
Currency Converter
Live exchange rates, 30+ currencies
Area Converter
Square meters, feet, acres, hectares
Data Size Converter
Bytes, KB, MB, GB, TB and bits
Temperature Converter
Celsius, Fahrenheit, Kelvin and Rankine
Time Unit Converter
Seconds, minutes, hours, days, weeks
Height Converter
Feet/inches to cm and meters
Pressure Converter
Pascal, bar, PSI, atmospheres, mmHg