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Kilocalories to Kilojoules Converter

Convert kilocalories to kilojoules and kJ to kcal instantly. Bidirectional energy converter with formula and common values.

kcal

Kilojoules

1,046

kJ

250 kcal = 1,046 kJ

kJ = kcal × 4.184

Kilocalories to Kilojoules: 1 kcal equals 4.184 kJ. To convert kilocalories to kilojoules, multiply by 4.184 (kJ = kcal × 4.184). For example, 10 kcal = 41.84 kJ.

How to Convert Kilocalories to Kilojoules

To convert from kilocalories to kilojoules, multiply the value by 4.184. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

  • Kilocalories to Kilojoules: kJ = kcal × 4.184
  • Kilojoules to Kilocalories: kcal = kJ ÷ 4.184

Kilocalories to Kilojoules Conversion Chart

Kilocalories (kcal)Kilojoules (kJ)
0.10.4184
0.251.046
0.52.092
14.184
28.368
312.552
520.92
1041.84
2083.68
25104.6
50209.2
100418.4
2501046
10004184

Understanding the Units

What is a Kilocalorie?

A kilocalorie (kcal) equals 1,000 small calories, or 4,184 joules. In nutrition, the food "Calorie" (capital C) refers to the kilocalorie.

Common contexts: nutrition (US), metabolism, food labeling.

What is a Kilojoule?

A kilojoule equals 1,000 joules.

Common contexts: nutrition labeling (outside US), mechanical engineering.

Real-World Reference Points

Item Kilocalories (kcal) Kilojoules (kJ)
Slice of bread80334.72
Banana (medium)105439.32
Daily intake (adult)20008368

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FAQ

How many kilojoules are in one kilocalorie?

One kilocalorie equals exactly 4.184 kilojoules. This is the most common conversion seen on food labels worldwide.

How do I convert kcal to kJ?

Multiply the kcal value by 4.184. For example, 350 kcal × 4.184 = 1,464.4 kJ.

Why do food labels show both kJ and kcal?

International food labeling standards require kilojoules (the SI-derived unit), while consumers in many countries are more familiar with kilocalories. Showing both helps global readability.

How many kJ should I eat per day?

The commonly cited 2,000 kcal daily intake equals about 8,368 kJ. Individual needs vary based on age, sex, weight, and activity level.

How many kilojoules are in 1 kilocalory?

1 kcal equals 4.184 kJ.

How do you convert kilocalories to kilojoules?

Multiply the kilocalory value by 4.184. Formula: kJ = kcal × 4.184.

How many kilojoules are in 5 kilocalories?

5 kcal = 20.92 kJ.

How do you convert kilojoules back to kilocalories?

Use the inverse formula: kcal = kJ ÷ 4.184. For example, 1 kJ = 0.239006 kcal.

What is the difference between Kilocalory and Kilojoul?

A kilocalorie (kcal) equals 1,000 small calories, or 4,184 joules. In nutrition, the food "Calorie" (capital C) refers to the kilocalorie. A kilojoule equals 1,000 joules.