By Debmedia Technologies LLP · Kolkata, India · Updated
What Is It and When Do You Need It?
Energy is the capacity to do work. The joule is the SI unit, food labels use kilocalories, electricity bills use kilowatt-hours, and heating and cooling often use BTU.
This converter handles 11 units for joule and shows the result in all of them at once, so you rarely need a second lookup.
How to Use This Tool
- Type the value you want to convert.
- Choose the unit you have in the From list.
- Choose the unit you want in the To list.
- Press Convert and read the answer and the table of every unit.
How the Calculation Works
Every unit is stored as a multiple of one reference unit (the joule). To convert, the value is multiplied into the reference unit and then divided by the size of the target unit. All factors are exact or taken from standard definitions, and results show up to ten significant digits.
Worked Example
| You enter | You get |
|---|---|
| 1 J | 0.001 kJ |
| 10 J | 1e-05 MJ |
| 100 kJ | 100000 J |
Reference values:
| From | To |
|---|---|
| 1 Joule | 0.001 kJ |
| 1 Joule | 1e-06 MJ |
| 1 Joule | 0.23900574 cal |
| 1 Joule | 0.00023900574 kcal |
| 1 Joule | 0.00027777778 Wh |
| 1 Joule | 2.777778e-7 kWh |
| 1 Joule | 0.00094781712 BTU |
| 1 Joule | 9.478171e-9 thm |
| 1 Joule | 6.241509e18 eV |
| 1 Joule | 0.73756215 ft·lb |
Common Uses
- Reading food labels in kilojoules and kilocalories.
- Understanding electricity bills in kWh.
- Heating and air-conditioner ratings in BTU.
- Physics work in joules and electronvolts.
Tips and Common Mistakes
- One kilowatt-hour is 3.6 million joules.
- The "Calorie" on food labels is a kilocalorie, which is 1,000 small calories.
- Use the table under the answer to see the same value in every unit.
Related Tools
Next, you may need the power converter, force converter, torque converter, angle converter.
Everything runs in your browser. Nothing you type is uploaded, stored or sent to any outside service.
Frequently Asked Questions
Disclaimer: results are calculated in your browser from the numbers you enter. Check important results before you rely on them for money, health, safety or legal decisions.