BTU (th) to Kilocalorie Converter

Energy Converter

27 units available

Decimals:

From

To

0.251996

1 BTU = 0.251996 kcal

Formula:

kcal = BTU × 0.2519956979

With your value: 1 BTU = 0.2519957 kcal

How big is that?

Everyday references on a logarithmic scale, all expressed in btu (th) so you can sanity-check the result.

Heartbeat (1/1.1e+3 your value)0.000948 BTU

Your value1.00 BTU

AA battery charge (9.5× your value)9.48 BTU

Slice of bread (2.7e+2× your value)266 BTU

Daily food intake (8.0e+3× your value)7.97e+3 BTU

Litre of petrol (3.2e+4× your value)3.24e+4 BTU

Other BTU (th) to Kilocalorie conversions

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

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

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

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.

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

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

How to Convert BTU (th) to Kilocalorie

To convert from BTU (th) (BTU) to Kilocalorie (kcal), multiply the value by 0.2519956979.

Formula: kcal = BTU × 0.2519956979

Reverse: BTU = kcal × 3.9683217148

Step-by-Step Example

Start with your value in BTU (th). For example: 5 BTU
Multiply by the conversion factor: 5 x 0.2519956979
The result is: 1.259978 kcal

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.

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.

Frequently Asked Questions

How many Kilocalorie are in 1 BTU (th)?

There are exactly 0.2519956979 Kilocalorie in 1 BTU (th). This means the conversion factor from BTU (th) to Kilocalorie is 0.2519956979.

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

The formula to convert BTU (th) to Kilocalorie is: kcal = BTU × 0.2519956979. For example, to convert 10 BTU (th) to Kilocalorie, you would multiply 10 by 0.2519956979.

What is a BTU (th)?