About the Energy Converter
Convert between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, and BTU. Enter a numeric value above, choose the units to convert from and to, then click Convert.
Why use this converter?
- Fast client-side calculation — your data never leaves your browser.
- Covers common energy units used in physics, engineering, and everyday use.
- Useful for power consumption estimates, nutrition, and energy analysis.
How to use
- Enter the numeric value you want to convert.
- Select the source unit (e.g., Kilowatt-hours).
- Select the target unit (e.g., BTU).
- Press Convert to see the result below the form.