Energy Converter

Convert between energy / work / heat units

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4.184 kJ

rate：1 kcal = 4.184 kJ

Decimals 6 Thousands separator Scientific notation

Results in all units

1 kcal

Unit	Symbol	Value
Metric
Joules	J	4,184
Kilojoules	kJ	4.184
Megajoules	MJ	0.004184
Millijoules	mJ	4,184,000
Calories	cal	1,000
Kilocalories	kcal	1
Calories (nutritional)	Cal	1
Watt hours	Wh	1.162222
Kilowatt hours	kWh	0.001162
Megawatt hours	MWh	0.000001
Ergs	erg	41,840,000,000
Electron volts	eV	2.611447e+22
Imperial / Other
British thermal units	BTU	3.965667
Foot pounds	ft·lb	3,085.960033
Horsepower hours	hp·h	0.001559
Therms	thm	0.00004
Tons of TNT	tTNT	0.000001

History & Background

The concept of energy took a long time to form. Later, James Joule proved through his "mechanical equivalent of heat" experiment that heat and work are interconvertible, leading to the energy unit "joule" named after him.

Conversion Details

Energy conversion is based on the joule (J), covering work, heat and electrical energy.

Common conversions: 1 kcal = 4.184 kJ, 1 kWh = 3.6 MJ, 1 BTU ≈ 1,055 J.

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2 Tons of TNT → 8,368 Megajoules ⚡ Energy 7 Joules → 1.673e-9 Tons of TNT ⚡ Energy 52 Foot pounds → 2.626263e-5 Horsepower hours ⚡ Energy 88 Kilowatt hours → 316.8 Megajoules ⚡ Energy 28 Megajoules → 6,692,160.6119 Calories ⚡ Energy 55 Millijoules → 1.527778e-5 Watt hours ⚡ Energy 26 Millijoules → 7.222222e-6 Watt hours ⚡ Energy 81 Watt hours → 0.081 Kilowatt hours ⚡ Energy 461 Kilojoules → 110.1816 Kilocalories ⚡ Energy 30 Kilocalories → 3e-5 Tons of TNT ⚡ Energy

Frequently Asked Questions

How much is 1 Kilocalories in Kilojoules?

1 kcal = 4.184 kJ. Multiply your value by this rate to convert manually.

How do I convert Kilocalories to Kilojoules?

Enter the value in the input box, pick the target unit and read the result right away. As a reference, 1 kcal = 4.184 kJ.

Which units does this converter support?

It supports Joules, Kilojoules, Megajoules, Millijoules, Calories and many more. Use the search box above to filter units quickly.

How accurate are the conversion results?

Conversions follow internationally accepted definitions. Results can show up to 12 decimals, and scientific notation is available for extremely large or tiny values.