Calorie/Hour to BTU/Hour Converter

Power Converter

22 units available

Decimals:

From

To

0.003966

1 cal/h = 0.003966 BTU/h

Formula:

BTU/h = cal/h × 0.0039656668

With your value: 1 cal/h = 0.00396567 BTU/h

How big is that?

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

Your value1.00 cal/h

LED bulb (7.7e+3× your value)7.74e+3 cal/h

Laptop (5.6e+4× your value)5.59e+4 cal/h

Microwave oven (8.6e+5× your value)8.60e+5 cal/h

Electric kettle (2.6e+6× your value)2.58e+6 cal/h

Family car engine (7.7e+7× your value)7.74e+7 cal/h

Other Calorie/Hour to BTU/Hour conversions

2 cal/h to BTU/h 3 cal/h to BTU/h 4 cal/h to BTU/h 5 cal/h to BTU/h 6 cal/h to BTU/h 7 cal/h to BTU/h 8 cal/h to BTU/h

Calorie/Hour to BTU/Hour Conversion Table

Calorie/Hour (cal/h)	BTU/Hour (BTU/h)
0.5	0.001983
1	0.003966
2	0.007931
5	0.019828
10	0.039657
15	0.059485
20	0.079313
25	0.099142
50	0.198283
100	0.396567
250	0.991417
500	1.982833
1000	3.965667

BTU/Hour to Calorie/Hour Conversion Table

BTU/Hour (BTU/h)	Calorie/Hour (cal/h)
0.5	126.0822
1	252.164401
2	504.328802
5	1,260.822004
10	2,521.644008
15	3,782.466012
20	5,043.288015
25	6,304.110019
50	12,608.220039
100	25,216.440077
250	63,041.100193
500	126,082.200385
1000	252,164.40077

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.

Calorie/Hour (cal/h)

Power

Exact conversion

Derived from the watt (1 W = 1 J/s).

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/Hour (BTU/h)

Power

Exact conversion

Derived from the watt (1 W = 1 J/s).

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 Calorie/Hour to BTU/Hour

To convert from Calorie/Hour (cal/h) to BTU/Hour (BTU/h), multiply the value by 0.0039656668.

Formula: BTU/h = cal/h × 0.0039656668

Reverse: cal/h = BTU/h × 252.16440077

Step-by-Step Example

Start with your value in Calorie/Hour. For example: 5 cal/h
Multiply by the conversion factor: 5 x 0.0039656668
The result is: 0.019828 BTU/h

About Calorie/Hour

The calorie/hour (cal/h) is a unit of power. One calorie/hour equals 0.001162222222 watts. UnitConvertLab converts it against every other power unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

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

About BTU/Hour

The btu/hour (BTU/h) is a unit of power. One btu/hour equals 0.2930710702 watts. UnitConvertLab converts it against every other power unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

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

Frequently Asked Questions

How many BTU/Hour are in 1 Calorie/Hour?

There are exactly 0.0039656668 BTU/Hour in 1 Calorie/Hour. This means the conversion factor from Calorie/Hour to BTU/Hour is 0.0039656668.

What is the formula to convert Calorie/Hour to BTU/Hour?

The formula to convert Calorie/Hour to BTU/Hour is: BTU/h = cal/h × 0.0039656668. For example, to convert 10 Calorie/Hour to BTU/Hour, you would multiply 10 by 0.0039656668.

What is a Calorie/Hour?