Calories to Kilojoules Converter
Exercise times are estimates for a 70 kg adult.
100 kcal = 418.4 kJ. One Calorie is 4.184 kilojoules, so the working is 100 × 4.184 = 418.4.
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How To Convert 100 Calories To kJ
- Start with 100 Calories (the same as 100 kcal).
- Multiply by 4.184.
- 100 × 4.184 = 418.4 kJ. On food labels this would usually be rounded to 418 kJ.
Quick mental check: multiply by 4.2. 100 × 4.2 = 420 kJ, only 1.6 kJ more than the exact value.
What 100 Calories Looks Like In Food
- Beer, light (375 ml), 418 kJ
- Mango, 1 cup sliced (165 g), 414 kJ
- Prawns, cooked (100 g), 414 kJ
- Pear, medium (178 g), 423 kJ
Typical serves shown, the food kJ chart has many more.
100 Calories On A Food Label
On a label printed in kilojoules, look for about 420 kJ in the energy row. If that figure is per 30 g serve, the food has about 1,395 kJ per 100 g, a medium-density food.
How Long Does It Take To Burn 100 Calories?
| Activity | 60 kg person | 70 kg person | 85 kg person |
|---|---|---|---|
| Walking, moderate (5 km/h) | 27 min | 23 min | 19 min |
| Jogging (8 km/h) | 11 min | 10 min | 8 min |
| Cycling, moderate | 14 min | 12 min | 10 min |
| Swimming, moderate laps | 16 min | 14 min | 12 min |
For a 70 kg adult that’s about 23 min of walking or 10 min of jogging.
100 Calories As Part Of Your Day
| Daily intake | Share used by 418 kJ |
|---|---|
| 5,021 kJ (1,200 kcal) weight-loss plan | 8.3% |
| 6,276 kJ (1,500 kcal) plan | 6.7% |
| 8,368 kJ (2,000 kcal) US/UK/EU reference | 5% |
| 8,700 kJ AU/NZ label reference | 4.8% |
| 10,460 kJ (2,500 kcal) active adult | 4% |
Nearby Calories To kJ Conversions
FAQ
How many kJ is 100 Calories?
100 Calories is 418.4 kJ (100 × 4.184).
How many kilojoules is 100 kcal?
Also 418.4 kJ, kcal and Calories are the same unit.
How do I convert 100 Calories to kJ in my head?
Multiply by 4 and add 5%: about 420 kJ. The exact value is 418.4 kJ.
How long does it take to burn 100 Calories walking?
About 23 min of walking at 5 km/h for a 70 kg adult.