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! Metric Converter 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 to Joules (kcal → J) — Free Online Converter

Формула преобразования Килокалории в Джоули

Чтобы преобразовать Килокалории в Джоули, вы можете использовать следующую формулу:

Джоули = Килокалории × 0.0002390057361

Это означает, что вам нужно умножить значение Килокалории на 0.0002390057361, чтобы получить эквивалентное значение в Джоули.

kcal	J
0.01 kcal	41.84 J
0.1 kcal	418.4 J
0.5 kcal	2092 J
1 kcal	4184 J
5 kcal	20920 J
10 kcal	41840 J
50 kcal	209200 J
100 kcal	418400 J
500 kcal	2092000 J
1000 kcal	4184000 J

kcal

0.01 kcal

41.84 J

0.1 kcal

418.4 J

0.5 kcal

2092 J

1 kcal

4184 J

5 kcal

20920 J

10 kcal

41840 J

50 kcal

209200 J

100 kcal

418400 J

500 kcal

2092000 J

1000 kcal

4184000 J

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.

Килокалории → Джоули