How many kilocalories are in 1 kilojoule?

1 kJ equals 0.2390057361 kcal. This is an exact conversion factor defined by NIST.

How do I convert kilojoules to kilocalories?

Multiply the value in kJ by the conversion factor. For example, 10 kJ = 2.390057361 kcal. Use our calculator above for instant results.

Is the kilojoules to kilocalories conversion exact?

Yes, this conversion is mathematically exact based on the international definition of these units (NIST SP 811).

Can I convert kilojoules to kilocalories offline?

Yes! OmniConvert runs entirely in your browser — no internet connection needed after the page loads. Your data never leaves your device, ensuring complete privacy.

What is the difference between kilojoules and kilocalories?

Kilojoules (kJ) and Kilocalories (kcal) are both units of energy but belong to different measurement systems. 1 kJ = 0.2390057361 kcal. Use the converter above to switch between them instantly.

Kilojoules to Kilocalories (kJ → kcal) — Free Online Converter

kJ → kcal Reference Table

kJ	kcal
0.001 kJ	0.0002390057361 kcal
0.002 kJ	0.0004780114723 kcal
0.003 kJ	0.0007170172084 kcal
0.004 kJ	0.0009560229446 kcal
0.005 kJ	0.001195028681 kcal
0.006 kJ	0.001434034417 kcal
0.007 kJ	0.001673040153 kcal
0.008 kJ	0.001912045889 kcal
0.009 kJ	0.002151051625 kcal
0.01 kJ	0.002390057361 kcal
0.02 kJ	0.004780114723 kcal
0.03 kJ	0.007170172084 kcal
0.04 kJ	0.009560229446 kcal
0.05 kJ	0.01195028681 kcal
0.06 kJ	0.01434034417 kcal
0.07 kJ	0.01673040153 kcal
0.08 kJ	0.01912045889 kcal
0.09 kJ	0.02151051625 kcal
0.1 kJ	0.02390057361 kcal
0.2 kJ	0.04780114723 kcal
0.3 kJ	0.07170172084 kcal
0.4 kJ	0.09560229446 kcal
0.5 kJ	0.1195028681 kcal
0.6 kJ	0.1434034417 kcal
0.7 kJ	0.1673040153 kcal
0.8 kJ	0.1912045889 kcal
0.9 kJ	0.2151051625 kcal
1 kJ	0.2390057361 kcal
1.5 kJ	0.3585086042 kcal
2 kJ	0.4780114723 kcal
2.5 kJ	0.5975143403 kcal
3 kJ	0.7170172084 kcal
3.5 kJ	0.8365200765 kcal
4 kJ	0.9560229446 kcal
4.5 kJ	1.075525813 kcal
5 kJ	1.195028681 kcal
5.5 kJ	1.314531549 kcal
6 kJ	1.434034417 kcal
6.5 kJ	1.553537285 kcal
7 kJ	1.673040153 kcal
7.5 kJ	1.792543021 kcal
8 kJ	1.912045889 kcal
8.5 kJ	2.031548757 kcal
9 kJ	2.151051625 kcal
9.5 kJ	2.270554493 kcal
10 kJ	2.390057361 kcal
11 kJ	2.629063098 kcal
12 kJ	2.868068834 kcal
13 kJ	3.10707457 kcal
14 kJ	3.346080306 kcal
15 kJ	3.585086042 kcal
16 kJ	3.824091778 kcal
17 kJ	4.063097514 kcal
18 kJ	4.30210325 kcal
19 kJ	4.541108987 kcal
20 kJ	4.780114723 kcal
25 kJ	5.975143403 kcal
30 kJ	7.170172084 kcal
35 kJ	8.365200765 kcal
40 kJ	9.560229446 kcal
45 kJ	10.75525813 kcal
50 kJ	11.95028681 kcal
55 kJ	13.14531549 kcal
60 kJ	14.34034417 kcal
65 kJ	15.53537285 kcal
70 kJ	16.73040153 kcal
75 kJ	17.92543021 kcal
80 kJ	19.12045889 kcal
85 kJ	20.31548757 kcal
90 kJ	21.51051625 kcal
95 kJ	22.70554493 kcal
100 kJ	23.90057361 kcal
120 kJ	28.68068834 kcal
125 kJ	29.87571702 kcal
130 kJ	31.0707457 kcal
140 kJ	33.46080306 kcal
150 kJ	35.85086042 kcal
160 kJ	38.24091778 kcal
175 kJ	41.82600382 kcal
180 kJ	43.0210325 kcal
200 kJ	47.80114723 kcal
225 kJ	53.77629063 kcal
250 kJ	59.75143403 kcal
275 kJ	65.72657744 kcal
300 kJ	71.70172084 kcal
350 kJ	83.65200765 kcal
400 kJ	95.60229446 kcal
450 kJ	107.5525813 kcal
500 kJ	119.5028681 kcal
600 kJ	143.4034417 kcal
700 kJ	167.3040153 kcal
750 kJ	179.2543021 kcal
800 kJ	191.2045889 kcal
900 kJ	215.1051625 kcal
1000 kJ	239.0057361 kcal
1200 kJ	286.8068834 kcal
1250 kJ	298.7571702 kcal
1500 kJ	358.5086042 kcal
1750 kJ	418.2600382 kcal
2000 kJ	478.0114723 kcal
2500 kJ	597.5143403 kcal
3000 kJ	717.0172084 kcal
4000 kJ	956.0229446 kcal
4500 kJ	1075.525813 kcal
5000 kJ	1195.028681 kcal
6000 kJ	1434.034417 kcal
7000 kJ	1673.040153 kcal
7500 kJ	1792.543021 kcal
8000 kJ	1912.045889 kcal
9000 kJ	2151.051625 kcal
10000 kJ	2390.057361 kcal
15000 kJ	3585.086042 kcal
20000 kJ	4780.114723 kcal
25000 kJ	5975.143403 kcal
50000 kJ	11950.28681 kcal
75000 kJ	17925.43021 kcal
100000 kJ	23900.57361 kcal

Values based on NIST SP 811 conversion factors

Why Convert Kilojoules to Kilocalories?

Converting between kilojoules (kJ) and kilocalories (kcal) is one of the most common energy conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert kJ to kcal saves time and prevents errors.

Energy conversions from kJ to kcal are crucial for dietitians, physicists, and engineers. In nutrition, understanding the link between calories and joules helps individuals manage their diet and energy intake effectively. In the power sector, converting between kilowatt-hours and British Thermal Units (BTU) is necessary for sizing heating and cooling systems for homes and offices. Physicists rely on precise energy unit conversions to calculate work, heat, and thermodynamic processes. Whether tracking fitness goals or analyzing home energy bills, accurate conversion empowers users to make better health and financial decisions.

How to Convert Kilojoules to Kilocalories

To convert kilojoules to kilocalories, use the following formula:

kcal = kJ × 0.2390057361

Example: 1 kJ = 0.2390057361 kcal

For example, 5 kJ = 1.195028681 kcal, 10 kJ = 2.390057361 kcal, and 100 kJ = 23.90057361 kcal. For larger values, 1000 kJ = 239.0057361 kcal. Conversely, 1 kcal = 4.184 kJ. Our calculator above performs this conversion instantly with full precision — no rounding errors.

Common Use Cases

Daily calorie intake (2000 kcal): 8368 kJ = 2000 kcal
A bowl of cooked white rice: 837 kJ = 200.0478011 kcal
30 minutes of running: 1255 kJ = 299.9521989 kcal
A Big Mac hamburger: 2301 kJ = 549.9521989 kcal
Recommended intake for an active male: 4184 kJ = 1000 kcal

Common Mistakes to Avoid

Calorie confusion: Food 'Calories' are actually kilocalories (kcal).
Joule scale: 1 kWh is 3.6 million Joules (orders of magnitude difference).
Power vs Energy: mixing up Watts (power) and Watt-hours (energy).

Pro Tips

Food labels: Learn to read kcal; average adult needs ~2000 kcal/day.
Battery capacity: Wh = V * Ah. Useful for comparing different voltage batteries.
Efficiency: Energy cannot be created/destroyed, only converted (with some loss as heat).

What is a Kilojoule?

A unit of energy equal to 1,000 Joules.

Standard unit for food energy labeling in most of the world.

What is a Kilocalorie?

A unit of energy equal to 1,000 calories ("Calorie").

Widely used for measuring food energy content.

Kilojoules → Kilocalories

Kilojoules to Kilocalories Formula