Kilocalorie to British Thermal Unit Converter
Energy · unit-converter
Convert Kilocalorie to British Thermal Unit with fixed input and output units, a step-by-step formula line, and reference tables. Factors are joule-based; food energy uses thermochemical calories. The full Energy Converter also includes MMBtu, toe, thermal kWh, and MeV/GeV.
Calculator
From: Kilocalorie (kcal)
To: British Thermal Unit (btu)
About Kilocalorie
The kilocalorie (kcal) is 1,000 calories in the nutrition sense—often labeled “Calorie” on food packaging. Here 1 kcal = 4,184 J (thermochemical calorie definition used in this tool).
About British Thermal Unit
The British thermal unit used here is the IT BTU: ≈ 1,055.056 J. It appears in HVAC, heating equipment, and US engineering data.
How to convert kilocalories to british thermal units
1 kilocalorie is equal to 3.96566683139092 british thermal unit when both are expressed in joule-equivalents:
1 kcal = (4,184 J ÷ 1,055.05585262 J) btu = 3.96566683139092 btu
Each kilocalorie is defined as 4,184 J and each british thermal unit as 1,055.05585262 J in this tool, so one kcal equals 4,184 ÷ 1,055.05585262 btu = 3.96566683139092 btu.
Let d(kcal) be the numeric amount in Kilocalorie (kcal), and d(btu) the amount in British Thermal Unit (btu). Then:
d(btu) = d(kcal) × (4,184 / 1,055.05585262)
Equivalently, divide by how many kcal fit into one btu (joules per btu divided by joules per kcal):
d(btu) = d(kcal) ÷ 0.2521644007218
Or: british thermal unit = kilocalorie ÷ 0.2521644007218
Examples
Example #1: Convert 1 kcal to british thermal unit
1 kcal = 1 kcal × (4,184/1,055.05585262) btu = 3.9656668314 btu
1 kcal = 1 kcal ÷ 0.2521644007218 = 3.9656668314 btu
Example #2: Convert 10 kcal to british thermal unit
10 kcal = 10 kcal × (4,184/1,055.05585262) btu = 39.6566683139 btu
10 kcal = 10 kcal ÷ 0.2521644007218 = 39.6566683139 btu
Summary
To convert Kilocalorie to British Thermal Unit, multiply the value in kcal by the ratio of joules per kcal divided by joules per btu. Equivalently: value_btu = value_kcal × (4184 / 1055.05585262). Numerically, 1 kcal equals 3.9656668313909194 btu.
Relationship context
You are converting between food / nutrition energy (calories) (Kilocalories) and US / imperial engineering units (BTU, therm, ft·lb) (British Thermal Units). All values are mapped through joules first. The numeric factor is 3.965667e+0.
Conversion tables
| Kilocalorie (kcal) | British Thermal Unit (btu) |
|---|---|
| 0.1 | 0.3965666831 |
| 1 | 3.9656668314 |
| 2 | 7.9313336628 |
| 3 | 11.8970004942 |
| 4 | 15.8626673256 |
| 5 | 19.828334157 |
| 6 | 23.7940009883 |
| 7 | 27.7596678197 |
| 8 | 31.7253346511 |
| 9 | 35.6910014825 |
| Kilocalorie (kcal) | British Thermal Unit (btu) |
|---|---|
| 10 | 39.6566683139 |
| 20 | 79.3133366278 |
| 30 | 118.970004942 |
| 40 | 158.626673256 |
| 50 | 198.28334157 |
| 60 | 237.940009883 |
| 70 | 277.596678197 |
| 80 | 317.253346511 |
| 90 | 356.910014825 |
| 100 | 396.566683139 |