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Kilocalories to Gigajoules Converter

Convert kilocalories to gigajoules and back instantly with formula and common values.

kcal

Gigajoules

0.0003

GJ

73 kcal = 0.0003 GJ

GJ = kcal × 4.1840e-6

Kilocalories to Gigajoules: 1 kcal equals 4.18400e-6 GJ. To convert kilocalories to gigajoules, multiply by 4.18400e-6 (GJ = kcal × 4.1840e-6). For example, 10 kcal = 4.18400e-5 GJ.

How to Convert Kilocalories to Gigajoules

To convert from kilocalories to gigajoules, multiply the value by 4.18400e-6. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

  • Kilocalories to Gigajoules: GJ = kcal × 4.1840e-6
  • Gigajoules to Kilocalories: kcal = GJ ÷ 4.1840e-6

Kilocalories to Gigajoules Conversion Chart

Kilocalories (kcal)Gigajoules (GJ)
0.14.18400e-7
0.251.04600e-6
0.52.09200e-6
14.18400e-6
28.36800e-6
31.25520e-5
52.09200e-5
104.18400e-5
208.36800e-5
250.000105
500.000209
1000.000418
2500.001046
10000.004184

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 Gigajoule?

A gigajoule equals one billion joules (10⁹ J).

Common contexts: natural gas billing, large-scale energy reporting.

Real-World Reference Points

Item Kilocalories (kcal) Gigajoules (GJ)
Slice of bread800.0003
Banana (medium)1050.0004
Daily intake (adult)20000.0084

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FAQ

How do I convert kilocalories to gigajoules?

Multiply by 4.1840e-6. For example, 73 kcal × 4.1840e-6 = 0.0003 GJ.

What is the formula for kilocalories to gigajoules?

The formula is: GJ = kcal × 4.1840e-6.

How many gigajoules are in one kilocalorie?

One kilocalorie equals 4.000e-6 gigajoules.

How many gigajoules are in 1 kilocalory?

1 kcal equals 4.18400e-6 GJ.

How do you convert kilocalories to gigajoules?

Multiply the kilocalory value by 4.18400e-6. Formula: GJ = kcal × 4.1840e-6.

How many gigajoules are in 5 kilocalories?

5 kcal = 2.09200e-5 GJ.

How do you convert gigajoules back to kilocalories?

Use the inverse formula: kcal = GJ ÷ 4.1840e-6. For example, 1 GJ = 239005.736138 kcal.

What is the difference between Kilocalory and Gigajoul?

A kilocalorie (kcal) equals 1,000 small calories, or 4,184 joules. In nutrition, the food "Calorie" (capital C) refers to the kilocalorie. A gigajoule equals one billion joules (10⁹ J).