1,000 kcal to MJ — 1,000 kilocalories in megajoules
Exact 1,000 ÷ 239.005736 = 4.184
1,000 kilocalories in other units
| Joules | 4,184,000 | J |
|---|---|---|
| Kilojoules | 4,184 | kJ |
| Megajoules | 4.184 | MJ |
| Watt-hours | 1,162.22 | Wh |
| Kilowatt-hours | 1.162222 | kWh |
| Calories | 1,000,000 | cal |
| British thermal units | 3,965.67 | BTU |
| Therms | 0.03965667 | thm |
| Foot-pounds | 3,085,960.03 | ft·lbf |
| Electronvolts | 26,114,473,967,543,832,268,505,088 | eV |
kcal to MJ at a glance
| Kilocalories | Megajoules |
|---|---|
| 1 kcal | 0.004184 MJ |
| 2 kcal | 0.008368 MJ |
| 3 kcal | 0.012552 MJ |
| 5 kcal | 0.02092 MJ |
| 10 kcal | 0.04184 MJ |
| 20 kcal | 0.08368 MJ |
| 25 kcal | 0.1046 MJ |
| 50 kcal | 0.2092 MJ |
| 100 kcal | 0.4184 MJ |
| 250 kcal | 1.046 MJ |
| 500 kcal | 2.092 MJ |
| 1,000 kcal | 4.184 MJ |
How to convert kilocalories to megajoules
Multiply by 0.004184 — one kilocalorie is 0.004184 megajoules. 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 ÷ 239.005736 = 4.184
In words: about four megajoules.
Questions
How many megajoules are in a kilocalorie?
One kilocalorie is 0.004184 megajoules. This figure is exact — it comes from the definition of the unit, not a measurement.
What is 1,000 kilocalories in megajoules?
1,000 kilocalories is 4.184 megajoules. The working is 1,000 ÷ 239.005736 = 4.184.
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.