800 Calories to kJ

The working

Shown to 2 decimal places, as the app shows it. One food Calorie (kcal) is 4.184 kilojoules.

kJ, Calories and kcal

Calories are the unit most recipes and fitness apps use. A food Calorie, written Cal here and also called kcal, is 4.184 kJ, and kilojoules (kJ) are what many food labels show. 800 Cal is 3,347.2 kJ, so a tracker that says 800 Cal and a label that says 3,347.2 kJ describe the same energy.

This is the size of a single meal or a large serve of one dish.

For scale, half of this amount is 400 Cal, which is 1,673.6 kJ. Twice it is 1,600 Cal, which is 6,694.4 kJ.

Foods with about this much energy

• About the same as a full English breakfastOne serving is 800 Cal (3,347.2 kJ).
• About the same as a serving of fish and chipsOne serving is 750 Cal (3,138 kJ).
• About the same as a Sunday roast dinnerOne serving is 850 Cal (3,556.4 kJ).

These are everyday single-serving estimates from the app's food list, not nutrition labels. Recipes and portions vary. See the whole list.

Walking guide

91 to 245 min of walking.

Adult reference guide: 45 to 120 kg at a reference walking pace. Actual times may be outside this range. The exercise page lists the other activities.

Nearby values

• 600 Cal is 2,510.4 kJ
• 700 Cal is 2,928.8 kJ
• 900 Cal is 3,765.6 kJ
• 1,000 Cal is 4,184 kJ

• Previous: 700 Cal
• Next: 900 Cal
• The other way: 3,500 kJ to Calories
• All conversions