Conversions
Energy Converter
Translate any energy quantity into joules, kilojoules, calories, kilocalories, watt-hours, or kilowatt-hours at once.
Translate energy between joules, calories, and watt-hours.
Energy factors
1 cal = 4.184 J, 1 kcal = 4,184 J, 1 Wh = 3,600 J, and 1 kWh = 3.6×10⁶ J. The calculator keeps every conversion synchronized.
How to use
- Enter the known value.
- Select the unit it represents.
- Review the equivalent energy across the remaining units.
Example
Input: Value = 2 kWh
Output: Joules ≈ 7.2 MJ, Calories ≈ 1.72×10⁶ cal
Student-friendly breakdown
This walkthrough emphasizes the most searched ideas for Energy Converter: Energy Converter. Start with the formula above, then follow the guided steps to double-check your work. For quick revision, highlight the givens, plug into the equation, and finish by verifying your units.
Need more support? Use the links below to open the long-form guide, browse additional examples, or hop into adjacent calculators within the same topic — each one is a quick way to double-check your work or handle a related question without starting from scratch.
Deep dive & study plan
Energy Converter: Swaps between joules, calories, and watt-hours in one view. It's built around energy, joule, watt-hour, so you can go from a raw question to a checked answer without switching tools.
The math behind it: 1 cal = 4.184 J, 1 kcal = 4,184 J, 1 Wh = 3,600 J, and 1 kWh = 3.6×10⁶ J. The calculator keeps every conversion synchronized.
To use it well: (1) Enter the known value. (2) Select the unit it represents. (3) Review the equivalent energy across the remaining units. Keep your units consistent as you go, and re-run a case you already know the answer to — it's the fastest way to catch a typo before it throws off a result you're relying on.
Worked example: entering Value = 2 kWh returns Joules ≈ 7.2 MJ, Calories ≈ 1.72×10⁶ cal. Try swapping in your own numbers next, especially a case you're unsure about, before you use this for something that matters.
Quick retention checklist
- Speak the formula aloud (or annotate it) so the relationships stick.
- Write each step in your own words and compare with the numbered list above.
- Swap in new numbers for the Example to make sure the calculator (and your logic) handles edge cases.
- Check at least one related calculator below — it's the fastest way to confirm your numbers still line up from a different angle.
FAQ & notes
Is there a difference between nutritional and physics calories?
Yes—nutritional calories are kilocalories. The converter lists both so you can match the context you care about.
Can I convert BTUs?
Not yet. Convert BTUs to joules manually (1 BTU ≈ 1,055.06 J) and paste the result here.
What formula does the Energy Converter use?
1 cal = 4.184 J, 1 kcal = 4,184 J, 1 Wh = 3,600 J, and 1 kWh = 3.6×10⁶ J. The calculator keeps every conversion synchronized.
How do I use the Energy Converter?
Enter the known value. Select the unit it represents. Review the equivalent energy across the remaining units.