How to convert kJ to calories (kcal)

To convert kilojoules (kJ) to calories (kcal), divide the kilojoule value by 4.184.

This is the standard conversion used by nutrition references, food labels, and calorie-tracking apps.

Here are quick conversions for common kJ values you'll see on food labels:

• 500 kJ = 119.5 kcal
• 1,000 kJ = 239.0 kcal
• 1,200 kJ = 286.8 kcal
• 2,000 kJ = 478.0 kcal
• 8,700 kJ = 2,079.3 kcal (common daily reference value)

Kilojoules (kJ) are the SI (International System of Units) unit for energy. In Australia, food labels commonly present energy in kJ as the primary unit.

Many fitness apps, nutrition databases, and tracking tools still use calories (kcal), so conversion is useful when comparing label values to app entries.

For everyday use, rounding to 1 decimal place is usually enough. Example: 286.807 kcal becomes 286.8 kcal.

If you need strict precision for scientific or clinical work, use the unrounded value or consult a qualified professional.

The kJ to CAL calculator on the homepage performs this conversion instantly. Enter the kJ value from a label to see calories (kcal).

For reverse conversion (calories to kJ), use the CAL to KJ calculator.