BTU/Second to Calorie/Second Converter

Power Converter

22 units available

Decimals:

From

To

252.164401

1 BTU/s = 252.164401 cal/s

Formula:

cal/s = BTU/s × 252.1644007218

With your value: 1 BTU/s = 252.16440072 cal/s

How big is that?

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

LED bulb (1/1.2e+2 your value)0.00853 BTU/s

Laptop (1/16 your value)0.0616 BTU/s

Microwave oven (1/1.1 your value)0.948 BTU/s

Your value1.00 BTU/s

Electric kettle (2.8× your value)2.84 BTU/s

Family car engine (85× your value)85.3 BTU/s

Other BTU/Second to Calorie/Second conversions

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

BTU/Second to Calorie/Second Conversion Table

BTU/Second (BTU/s)	Calorie/Second (cal/s)
0.5	126.0822
1	252.164401
2	504.328801
5	1,260.822004
10	2,521.644007
15	3,782.466011
20	5,043.288014
25	6,304.110018
50	12,608.220036
100	25,216.440072
250	63,041.10018
500	126,082.200361
1000	252,164.400722

Calorie/Second to BTU/Second Conversion Table

Calorie/Second (cal/s)	BTU/Second (BTU/s)
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

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/Second (BTU/s)

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

Calorie/Second (cal/s)

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 BTU/Second to Calorie/Second

To convert from BTU/Second (BTU/s) to Calorie/Second (cal/s), multiply the value by 252.1644007218.

Formula: cal/s = BTU/s × 252.1644007218

Reverse: BTU/s = cal/s × 0.0039656668

Step-by-Step Example

Start with your value in BTU/Second. For example: 5 BTU/s
Multiply by the conversion factor: 5 x 252.1644007218
The result is: 1,260.822004 cal/s

About BTU/Second

The btu/second (BTU/s) is a unit of power. One btu/second equals 1055.055853 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 Calorie/Second

The calorie/second (cal/s) is a unit of power. One calorie/second equals 4.184 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 Calorie/Second are in 1 BTU/Second?

There are exactly 252.1644007218 Calorie/Second in 1 BTU/Second. This means the conversion factor from BTU/Second to Calorie/Second is 252.1644007218.

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

The formula to convert BTU/Second to Calorie/Second is: cal/s = BTU/s × 252.1644007218. For example, to convert 10 BTU/Second to Calorie/Second, you would multiply 10 by 252.1644007218.

What is a BTU/Second?