Kilocalorie to BTU (th) Converter

Energy Converter

27 units available

Decimals:

From

To

3.968322

1 kcal = 3.968322 BTU

Formula:

BTU = kcal × 3.9683217148

With your value: 1 kcal = 3.96832171 BTU

How big is that?

Everyday references on a logarithmic scale, all expressed in kilocalorie so you can sanity-check the result.

Heartbeat (1/4.2e+3 your value)0.000239 kcal

Your value1.00 kcal

AA battery charge (2.4× your value)2.39 kcal

Slice of bread (67× your value)66.9 kcal

Daily food intake (2.0e+3× your value)2.01e+3 kcal

Litre of petrol (8.2e+3× your value)8.17e+3 kcal

Other Kilocalorie to BTU (th) conversions

2 kcal to BTU 3 kcal to BTU 4 kcal to BTU 5 kcal to BTU 6 kcal to BTU 7 kcal to BTU 8 kcal to BTU

Kilocalorie to BTU (th) Conversion Table

Kilocalorie (kcal)	BTU (th) (BTU)
0.5	1.984161
1	3.968322
2	7.936643
5	19.841609
10	39.683217
15	59.524826
20	79.366434
25	99.208043
50	198.416086
100	396.832171
250	992.080429
500	1,984.160857
1000	3,968.321715

BTU (th) to Kilocalorie Conversion Table

BTU (th) (BTU)	Kilocalorie (kcal)
0.5	0.125998
1	0.251996
2	0.503991
5	1.259978
10	2.519957
15	3.779935
20	5.039914
25	6.299892
50	12.599785
100	25.19957
250	62.998924
500	125.997849
1000	251.995698

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Kilocalorie (kcal)

Energy

Exact conversion

Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

BTU (th) (BTU)

Energy

Exact conversion

The International Table BTU is exactly 1055.055 852 62 J.

Thermochemical and 39 °F BTU definitions differ by up to 0.2 %.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Kilocalorie to BTU (th)

To convert from Kilocalorie (kcal) to BTU (th) (BTU), multiply the value by 3.9683217148.

Formula: BTU = kcal × 3.9683217148

Reverse: kcal = BTU × 0.2519956979

Step-by-Step Example

Start with your value in Kilocalorie. For example: 5 kcal
Multiply by the conversion factor: 5 x 3.9683217148
The result is: 19.841609 BTU

About Kilocalorie

The kilocalorie (food Calorie) equals 1,000 calories or 4,184 joules. It is the standard unit for food energy content.

Common uses: nutrition, diet, food labeling.

About BTU (th)

The btu (th) (BTU) is a unit of energy and work. One btu (th) equals 1054.35 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: energy calculations, engineering and science, education.

Frequently Asked Questions

How many BTU (th) are in 1 Kilocalorie?

There are exactly 3.9683217148 BTU (th) in 1 Kilocalorie. This means the conversion factor from Kilocalorie to BTU (th) is 3.9683217148.

What is the formula to convert Kilocalorie to BTU (th)?

The formula to convert Kilocalorie to BTU (th) is: BTU = kcal × 3.9683217148. For example, to convert 10 Kilocalorie to BTU (th), you would multiply 10 by 3.9683217148.

What is a Kilocalorie?