Joule to Kilojoule Converter
Convert between joules, calories, BTU, kWh, and more energy units. Perfect for physics, nutrition, and electricity calculations.
How to Convert Joule to Kilojoule
Converting between Joule and Kilojoule is straightforward with our free online converter above. Simply enter the value you want to convert, select the units, and get instant, accurate results.
Quick Steps:
- Enter the value you want to convert in the "Joule" field
- Select "Joule" as your "From" unit (if not already selected)
- Select "Kilojoule" as your "To" unit (if not already selected)
- The conversion result will appear instantly in the "Kilojoule" field
- You can also convert in reverse by entering a value in the "Kilojoule" field
Tip: Our converter works both ways - you can convert from Joule to Kilojoule or from Kilojoule to Joule instantly.
Common Joule to Kilojoule Conversions
| Joule | Kilojoule |
|---|---|
| 1 | 0.001 |
| 5 | 0.005 |
| 10 | 0.01 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
When to Use Joule vs Kilojoule
Joule is commonly used in most countries worldwide as part of the metric system.
Kilojoule is commonly used in most countries worldwide as part of the metric system.
Understanding when to use each unit helps ensure accurate communication and measurements in different contexts, whether you're traveling, cooking, working on projects, or conducting scientific research.
Frequently Asked Questions
How do I convert kilocalories to joules?
Multiply kilocalories by 4,184. For example, 1 kcal = 4,184 joules. This is commonly used in nutrition calculations.
What's the difference between calories and kilocalories?
1 kilocalorie (kcal) = 1,000 calories (cal). Food 'Calories' (with capital C) are actually kilocalories. So when you see 100 Calories on a food label, that's 100 kcal or 100,000 cal.
How many kWh in a BTU?
1 kWh = 3,412 BTU. To convert BTU to kWh, divide by 3,412. This is useful for comparing heating/cooling efficiency with electrical energy.
What is a joule?
A joule (J) is the SI unit of energy. It's defined as the energy transferred when a force of 1 newton moves an object 1 meter. 1 kWh = 3.6 million joules.
How do I convert food calories to kWh?
1 food Calorie (kcal) = 0.001163 kWh. So 1,000 kcal = 1.163 kWh. This shows the energy content of food in electrical terms.
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