Kilojoules to Calories Converter
Exercise times are estimates for a 70 kg adult.
300 kilojoules = 71.70 kcal, or about 72 Calories. The working is a single division: 300 ÷ 4.184 = 71.70.
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How To Convert 300 kJ To Calories
- Write down the kilojoules, here, 300.
- Divide by the conversion factor 4.184.
- The result, 71.70 kcal, is the same as 71.70 food Calories.
Shortcut: 300 × 0.239 = 71.7 kcal. Multiplying by 0.239 is the same as dividing by 4.184 to three decimal places.
Is 300 kJ A Lot?
300 kJ (72 Calories) is typical of a light snack: a piece of fruit, a slice of bread, a small yoghurt or a plain biscuit or two. It’s a sensible size for a between-meals snack for most adults.
- Egg, large (50 g), 301 kJ
- Spirit shot (40%) (30 ml), 272 kJ
- Honey, 1 tbsp (21 g), 268 kJ
- White bread, 1 slice (30 g), 335 kJ
Values are typical, the food kJ chart lists 120+ foods.
300 kJ On A Food Label
A label line that reads “300 kJ per serve” only tells half the story. Divide by the serve size and you get the energy density, how much energy is packed into every 100 g of the food.
| Serving size | kJ per 100 g | kcal per 100 g | Energy density |
|---|---|---|---|
| 25 g serve | 1,200 kJ | 287 kcal | medium |
| 40 g serve | 750 kJ | 179 kcal | medium |
| 60 g serve | 500 kJ | 120 kcal | low |
| 100 g serve | 300 kJ | 72 kcal | low |
| 150 g serve | 200 kJ | 48 kcal | very low |
| 250 g serve | 120 kJ | 29 kcal | very low |
For example, if a 60 g serve contains 300 kJ, the food has about 500 kJ per 100 g, a low-density food, similar to fresh fruit, yoghurt, cooked rice and legumes. Scale any pack to your portion with the food label calculator.
300 kJ In Your Meals
Here’s 300 kJ measured against meal-sized budgets for a lighter, average and more active day:
| Meal budget | 6,300 kJ day | 8,700 kJ day | 10,500 kJ day |
|---|---|---|---|
| Breakfast (25%) | 19% | 14% | 11% |
| Lunch (30%) | 16% | 11% | 10% |
| Dinner (35%) | 14% | 10% | 8% |
| Snacks (10%) | 48% | 34% | 29% |
How Long Does It Take To Burn 300 kJ?
| Activity | 60 kg person | 70 kg person | 85 kg person |
|---|---|---|---|
| Walking, moderate (5 km/h) | 20 min | 17 min | 14 min |
| Jogging (8 km/h) | 8 min | 7 min | 6 min |
| Cycling, moderate | 10 min | 9 min | 7 min |
| Swimming, moderate laps | 12 min | 10 min | 8 min |
At 70 kg you’d use up 300 kJ in about 17 min of walking: or 7 min if you jog. Check other activities in the exercise kJ calculator.
300 kJ As Part Of Your Day
| Daily intake | Share used by 300 kJ |
|---|---|
| 5,021 kJ (1,200 kcal) weight-loss plan | 6% |
| 6,276 kJ (1,500 kcal) plan | 4.8% |
| 8,368 kJ (2,000 kcal) US/UK/EU reference | 3.6% |
| 8,700 kJ AU/NZ label reference | 3.4% |
| 10,460 kJ (2,500 kcal) active adult | 2.9% |
300 kJ In Other Energy Units
| Unit | Value |
|---|---|
| Kilojoules (kJ) | 300 kJ |
| Calories / kilocalories (kcal) | 71.70 kcal |
| Small calories (cal) | 71,702 cal |
| Joules (J) | 300,000 J |
| Megajoules (MJ) | 0.3 MJ |
| Watt-hours (Wh) | 83.3 Wh |
Nearby kJ To Calories Conversions
| Kilojoules | Calories |
|---|---|
| 200 kJ | 47.8 kcal |
| 250 kJ | 59.8 kcal |
| 289 kJ | 69.1 kcal |
| 300 kJ | 71.7 kcal |
| 350 kJ | 83.7 kcal |
| 400 kJ | 95.6 kcal |
| 424 kJ | 101.3 kcal |
FAQ
How many Calories are in 300 kJ?
71.70 Calories, that’s 300 divided by 4.184.
How many kcal is 300 kilojoules?
300 kJ is 71.70 kcal. A kilocalorie and a food Calorie are the same unit.
Is 300 kJ a lot?
Not really. At about 72 Calories it’s a light snack, about 3.4% of an 8,700 kJ day.
How long does it take to walk off 300 kJ?
Roughly 17 min on foot for a 70 kg person; an 85 kg person needs about 14 min.
What if a food has 300 kJ per 100 g?
Then it has 71.7 kcal per 100 g, which is a low-density food. A 30 g handful would provide about 90 kJ (22 kcal).