1,000 kcal to BTU — 1,000 kilocalories in British thermal units
Exact 1,000 × 3.965667 = 3,965.67
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 BTU at a glance
| Kilocalories | British thermal units |
|---|---|
| 1 kcal | 3.965667 BTU |
| 2 kcal | 7.931334 BTU |
| 3 kcal | 11.897 BTU |
| 5 kcal | 19.828334 BTU |
| 10 kcal | 39.656668 BTU |
| 20 kcal | 79.313337 BTU |
| 25 kcal | 99.141671 BTU |
| 50 kcal | 198.283342 BTU |
| 100 kcal | 396.566683 BTU |
| 250 kcal | 991.416708 BTU |
| 500 kcal | 1,982.83 BTU |
| 1,000 kcal | 3,965.67 BTU |
How to convert kilocalories to British thermal units
Multiply by 3.965667 — one kilocalorie is 3.965667 British thermal units. 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 × 3.965667 = 3,965.67
In words: about three thousand nine hundred sixty-six British thermal units.
Questions
How many British thermal units are in a kilocalorie?
One kilocalorie is 3.965667 British thermal units. This figure is exact — it comes from the definition of the unit, not a measurement.
What is 1,000 kilocalories in British thermal units?
1,000 kilocalories is 3,965.67 British thermal units. The working is 1,000 × 3.965667 = 3,965.67.
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.