1,000 kJ to kcal — 1,000 kilojoules in kilocalories
Exact 1,000 ÷ 4.184 = 239.005736
1,000 kilojoules in other units
| Joules | 1,000,000 | J |
|---|---|---|
| Megajoule | 1 | MJ |
| Watt-hours | 277.777778 | Wh |
| Kilowatt-hours | 0.27777778 | kWh |
| Calories | 239,005.74 | cal |
| Kilocalories | 239.005736 | kcal |
| British thermal units | 947.81712 | BTU |
| Therms | 0.009478171203 | thm |
| Foot-pounds | 737,562.15 | ft·lbf |
| Electronvolts | 6,241,509,074,460,762,785,710,080 | eV |
kJ to kcal at a glance
| Kilojoules | Kilocalories |
|---|---|
| 1 kJ | 0.23900574 kcal |
| 2 kJ | 0.47801147 kcal |
| 3 kJ | 0.71701721 kcal |
| 5 kJ | 1.195029 kcal |
| 10 kJ | 2.390057 kcal |
| 20 kJ | 4.780115 kcal |
| 25 kJ | 5.975143 kcal |
| 50 kJ | 11.950287 kcal |
| 100 kJ | 23.900574 kcal |
| 250 kJ | 59.751434 kcal |
| 500 kJ | 119.502868 kcal |
| 1,000 kJ | 239.005736 kcal |
How to convert kilojoules to kilocalories
Multiply by 0.23900574 — one kilojoule is 0.23900574 kilocalories. That factor is exact: it comes from the definition of the units rather than from a measurement, so it will not change and does not need rounding.
Working 1,000 ÷ 4.184 = 239.005736
In words: about two hundred thirty-nine kilocalories.
What these units are
The kilojoule and the kilocalorie are covered in the energy unit guide, along with every other unit on this page.
Questions
How many kilocalories are in a kilojoule?
One kilojoule is 0.23900574 kilocalories. This figure is exact — it comes from the definition of the unit, not a measurement.
What is 1,000 kilojoules in kilocalories?
1,000 kilojoules is 239.005736 kilocalories. The working is 1,000 ÷ 4.184 = 239.005736.
Is a food Calorie the same as a calorie?
No — it is a thousand of them. The Calorie on a nutrition label is a kilocalorie, written with a capital C in principle and almost never in practice. A 250 Calorie chocolate bar holds 250,000 physics calories, or about 1,046 kilojoules, which is why European labels quote kJ alongside.
What does a kilowatt-hour actually represent?
One kilowatt drawn for one hour — a 1,000 W heater running for sixty minutes, or a 100 W bulb for ten hours. It is the unit your electricity bill is priced in, and it equals exactly 3.6 million joules.
How much energy is one BTU?
Roughly the heat needed to raise one pound of water by one degree Fahrenheit — about 1,055 joules, or the energy in a single kitchen match. Air conditioners are rated in BTU per hour, where a 12,000 BTU/h unit is one "ton" of cooling and draws around 3.5 kW of heat.
Why is the electronvolt so small?
Because it is sized for single particles: it is the energy one electron picks up crossing a one-volt potential difference. At about 1.6 × 10⁻¹⁹ joules it would be absurd for anything larger, which is precisely why particle physics uses it instead of dragging around twenty leading zeros.