Kilocalories to Joules (kcal → J) — Free Online Converter

kcal → J Reference Table

kcal	J
0.001 kcal	4.184 J
0.002 kcal	8.368 J
0.003 kcal	12.552 J
0.004 kcal	16.736 J
0.005 kcal	20.92 J
0.006 kcal	25.104 J
0.007 kcal	29.288 J
0.008 kcal	33.472 J
0.009 kcal	37.656 J
0.01 kcal	41.84 J
0.02 kcal	83.68 J
0.03 kcal	125.52 J
0.04 kcal	167.36 J
0.05 kcal	209.2 J
0.06 kcal	251.04 J
0.07 kcal	292.88 J
0.08 kcal	334.72 J
0.09 kcal	376.56 J
0.1 kcal	418.4 J
0.2 kcal	836.8 J
0.3 kcal	1255.2 J
0.4 kcal	1673.6 J
0.5 kcal	2092 J
0.6 kcal	2510.4 J
0.7 kcal	2928.8 J
0.8 kcal	3347.2 J
0.9 kcal	3765.6 J
1 kcal	4184 J
1.5 kcal	6276 J
2 kcal	8368 J
2.5 kcal	10460 J
3 kcal	12552 J
3.5 kcal	14644 J
4 kcal	16736 J
4.5 kcal	18828 J
5 kcal	20920 J
5.5 kcal	23012 J
6 kcal	25104 J
6.5 kcal	27196 J
7 kcal	29288 J
7.5 kcal	31380 J
8 kcal	33472 J
8.5 kcal	35564 J
9 kcal	37656 J
9.5 kcal	39748 J
10 kcal	41840 J
11 kcal	46024 J
12 kcal	50208 J
13 kcal	54392 J
14 kcal	58576 J
15 kcal	62760 J
16 kcal	66944 J
17 kcal	71128 J
18 kcal	75312 J
19 kcal	79496 J
20 kcal	83680 J
25 kcal	104600 J
30 kcal	125520 J
35 kcal	146440 J
40 kcal	167360 J
45 kcal	188280 J
50 kcal	209200 J
55 kcal	230120 J
60 kcal	251040 J
65 kcal	271960 J
70 kcal	292880 J
75 kcal	313800 J
80 kcal	334720 J
85 kcal	355640 J
90 kcal	376560 J
95 kcal	397480 J
100 kcal	418400 J
120 kcal	502080 J
125 kcal	523000 J
130 kcal	543920 J
140 kcal	585760 J
150 kcal	627600 J
160 kcal	669440 J
175 kcal	732200 J
180 kcal	753120 J
200 kcal	836800 J
225 kcal	941400 J
250 kcal	1046000 J
275 kcal	1150600 J
300 kcal	1255200 J
350 kcal	1464400 J
400 kcal	1673600 J
450 kcal	1882800 J
500 kcal	2092000 J
600 kcal	2510400 J
700 kcal	2928800 J
750 kcal	3138000 J
800 kcal	3347200 J
900 kcal	3765600 J
1000 kcal	4184000 J
1200 kcal	5020800 J
1250 kcal	5230000 J
1500 kcal	6276000 J
1750 kcal	7322000 J
2000 kcal	8368000 J
2500 kcal	10460000 J
3000 kcal	12552000 J
4000 kcal	16736000 J
4500 kcal	18828000 J
5000 kcal	20920000 J
6000 kcal	25104000 J
7000 kcal	29288000 J
7500 kcal	31380000 J
8000 kcal	33472000 J
9000 kcal	37656000 J
10000 kcal	41840000 J
15000 kcal	62760000 J
20000 kcal	83680000 J
25000 kcal	104600000 J
50000 kcal	209200000 J
75000 kcal	313800000 J
100000 kcal	418400000 J

Values based on NIST SP 811 conversion factors

Why Convert Kilocalories to Joules?

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

Energy conversions from kcal to J 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 Kilocalories to Joules

To convert kilocalories to joules, use the following formula:

J = kcal × 4184

Example: 1 kcal = 4184 J

For example, 5 kcal = 20920 J, 10 kcal = 41840 J, and 100 kcal = 418400 J. For larger values, 1000 kcal = 4184000 J. Conversely, 1 J = 0.0002390057361 kcal. Our calculator above performs this conversion instantly with full precision — no rounding errors.

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 Kilocalorie?

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

Widely used for measuring food energy content.

What is a Joule?

The joule (J) is the SI derived unit of energy. Defined as the work done by a force of one newton displacing an object by one meter.

Joules are used in science and engineering to measure work, energy, and heat. In nutrition, kilojoules (kJ) are used in many countries instead of calories.

Frequently Asked Questions

How many joules are in 1 kilocalorie?

1 kcal equals 4184 J. This is an exact conversion factor defined by NIST.

How do I convert kilocalories to joules?

Multiply the value in kcal by the conversion factor. For example, 10 kcal = 41840 J. Use our calculator above for instant results.

Is the kilocalories to joules conversion exact?

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

Can I convert kilocalories to joules 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 kilocalories and joules?

Kilocalories (kcal) and Joules (J) are both units of energy but belong to different measurement systems. 1 kcal = 4184 J. Use the converter above to switch between them instantly.

Kilocalories → Joules