FluffyBench

Energy Converter

Convert joules, kilojoules, kilowatt hours and thermochemical calories. 1 kWh is exactly 3,600,000 J and 1 cal is exactly 4.184 J.

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From
To

Convert to

Units

JouleJFrom
KilojoulekJkJ
Kilowatt hourkWhkWh
Thermochemical caloriecalcal

Other quantities have their own pages: Length, Mass, Temperature, Area, Volume, Speed, Pressure, Power and Data size.
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Need an energy value in a different unit?

Comparing an electricity reading or a food label? FluffyBench Energy Converter changes between joules, kilojoules, kilowatt hours, and thermochemical calories, with a result you can copy.

FluffyBench · 4 min read · Reviewed

How it works
  1. Match the source unit
  2. Choose the destination unit
  3. Enter your number
  4. Check and copy the result

On your device

Your number is converted on this page, without a conversion request.

Flexible number entry

Decimals, negatives, and 1e6-style numbers work.

Ready to paste

Copy gives a numeric value for your next calculation.

Limits Use the unit printed beside your reading.

Doing it in FluffyBench Energy Converter

Energy units are like miles and kilometers: changing the unit changes the number, while the amount stays the same. Match the label beside your reading to avoid giving that number a different meaning.

From is the unit beside your number; To is the unit you need. Here’s a kilowatt-hour reading converted to kilojoules.

  1. From Kilowatt hour and To Kilojoule.
    From Kilowatt hour and To Kilojoule.
    Step 1. Choose the unit you have under From and the unit you need under To.
    1. Choose Kilowatt hour under From.
    2. Choose Kilojoule under To.
  2. Input value 1, labeled kilowatt hours.
    Input value 1, labeled kilowatt hours.
    Step 2. The result updates as you type; there's no Convert button.
    1. Type 1 in Input value.
    2. The input is in kilowatt hours.
  3. Result 3,600 kilojoules, Copy, and the other energy equivalents.
    Result 3,600 kilojoules, Copy, and the other energy equivalents.
    Step 3. Before using the number, match kilojoules to what your destination asks for. Copy gives 3600, without commas or a unit; add kJ beside it where needed.
    1. Check 3,600 kilojoules.
    2. Copy the selected kilojoule result.
    3. Other equivalents have their own Copy buttons.

If you see ‘Enter a decimal number for Value,’ enter the number without a unit or thousands separators. If Copy is unavailable, you can select and copy the result.

Converting food Calories (kcal) to kilojoules

A food Calorie is a kilocalorie (kcal): 1,000 thermochemical calories, or 4.184 kJ. FluffyBench Energy Converter has cal, so prepare a food-label number like this.

A snack label reads 250 kcal. An arrow marked multiply by 1,000 leads to 250,000 cal for the input.

Preparing a food-label value for the cal input

The 250 kcal on the snack label and 250,000 cal represent the same energy. How we reviewed

Now use the prepared calorie count in FluffyBench Energy Converter.

  1. From Thermochemical calorie and To Kilojoule.
    From Thermochemical calorie and To Kilojoule.
    Step 1. Choose the unit you have under From and the unit you need under To.
    1. Choose Thermochemical calorie under From.
    2. Choose Kilojoule under To.
  2. 250000 entered as thermochemical calories.
    250000 entered as thermochemical calories.
    Step 2. Enter the calorie count after multiplying the food label's kcal by 1,000.
    1. Type 250000 for the 250 kcal snack.
    2. Check thermochemical calories.
  3. The snack?s energy is 1,046 kilojoules.
    The snack?s energy is 1,046 kilojoules.
    Step 3. The 250 kcal snack is 1,046 kilojoules.
    1. Read 1,046 kilojoules.

What changes when you swap energy units?

The arrows exchange the units, while the number you typed stays in place. Both results below use an input of 1.

From Kilowatt hour, To Kilojoule: input 1 kilowatt hours; the selected result row reads 3,600 kilojoules.

Before Swap

From Kilojoule, To Kilowatt hour: input stays 1, now in kilojoules; the selected result row reads 0.00027777777777778 kilowatt hours on one line.

After Swap

The arrows are labelled ‘Swap source and destination units.’ They swap From and To, keeping Input value at 1; the highlighted result row shows the new equivalent.

Have a reading in kW? Kilowatts describe how quickly energy is used; kWh describes an amount of energy. FluffyBench Power Converter converts kW to other power units.

Need to convert power units?

Need to convert temperature readings?

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