Energy Converter
Convert energy values between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, BTUs, electronvolts, foot-pounds, and therms.
Run tool
This online energy converter helps you switch numeric values across metric, imperial, and scientific energy measurements. You can convert between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, BTUs, electronvolts, foot-pounds, and therms. To perform a calculation, enter a number in the value field, select your starting unit, and pick the desired target unit. If you leave the value blank, the tool defaults to zero. The converter also uses joules as the initial source unit and kilowatt-hours as the initial target unit by default. When you run the conversion, the tool calculates the corresponding amount in your chosen destination unit, rounding the final value to ten decimal places for high precision. Whether you are balancing household utility readings in kilowatt-hours, evaluating heating output in BTUs or therms, or calculating physics problems involving electronvolts and joules, this tool delivers clear, straightforward energy figures instantly.
Instructions
- Enter the numeric energy amount you want to convert in the Value field, or leave it blank to evaluate zero.
- Select your starting energy unit from the From unit dropdown menu.
- Choose your intended destination unit from the To unit dropdown menu.
- Click the convert button to calculate the energy conversion rounded to ten decimal places.
Examples
- Converting 3,600,000 joules to kilowatt-hours produces 1.0 kilowatt-hour.
- Converting 1 calorie to joules produces approximately 4.184 joules.
- Converting 1 BTU to joules produces approximately 1055.06 joules.
FAQ
What happens if I do not enter a numeric value?
If you leave the value input empty, the converter defaults the starting amount to 0.
What units are selected by default?
The source unit defaults to Joules and the target unit defaults to Kilowatt Hours.
How many decimal places does the conversion include?
The resulting value is rounded to ten decimal places.
Which energy units can I convert between?
You can convert between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, BTUs, electronvolts, foot-pounds, and therms.