Convert 15 Watt (W) to Kilocalorie/Hour (kcal/h).

15 Watt equals 12.90631 Kilocalorie/Hour. Multiply 15 by 0.8604206503.

15 Watt = 12.90631 Kilocalorie/Hour

Worked example: converting Watt to Kilocalorie/Hour

Step 1 — start with the formula. kcal/h = W × 0.8604206503
Step 2 — substitute your figure. 15 W × 0.8604206503
Step 3 — read the result. 15 W = 12.90631 kcal/h
Step 4 — check it in reverse. W = kcal/h × 1.162222222 returns 15 W, which matches the figure you started with.

Power Converter

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Decimals:

From

To

12.90631

15 W = 12.90631 kcal/h

Formula:

kcal/h = W × 0.8604206503

With your value: 15 W = 12.90630975 kcal/h

How big is that?

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

LED bulb (1/1.7 your value)9.00 W

Your value15.0 W

Laptop (4.3× your value)65.0 W

Microwave oven (67× your value)1.00e+3 W

Electric kettle (2.0e+2× your value)3.00e+3 W

Family car engine (6.0e+3× your value)9.00e+4 W

Other Watt to Kilocalorie/Hour conversions

11 W to kcal/h 12 W to kcal/h 13 W to kcal/h 14 W to kcal/h 16 W to kcal/h 18 W to kcal/h 20 W to kcal/h Full Watt to Kilocalorie/Hour converter

Watt to Kilocalorie/Hour Conversion Table

Watt (W)	Kilocalorie/Hour (kcal/h)
0.5	0.43021
1	0.860421
2	1.720841
5	4.302103
10	8.604207
15	12.90631
20	17.208413
25	21.510516
50	43.021033
100	86.042065
250	215.105163
500	430.210325
1000	860.42065

Kilocalorie/Hour to Watt Conversion Table

Kilocalorie/Hour (kcal/h)	Watt (W)
0.5	0.581111
1	1.162222
2	2.324444
5	5.811111
10	11.622222
15	17.433333
20	23.244444
25	29.055556
50	58.111111
100	116.222222
250	290.555556
500	581.111111
1000	1,162.222222

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.

Watt (W)

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

Kilocalorie/Hour (kcal/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 Watt to Kilocalorie/Hour

To convert from Watt (W) to Kilocalorie/Hour (kcal/h), multiply the value by 0.8604206503.

Formula: kcal/h = W × 0.8604206503

Reverse: W = kcal/h × 1.162222222

Step-by-Step Example

Start with your value in Watt. For example: 5 W
Multiply by the conversion factor: 5 x 0.8604206503
The result is: 4.302103 kcal/h

About Watt

The watt (W) is a unit of power. One watt equals 1 watt. 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 Kilocalorie/Hour

The kilocalorie/hour (kcal/h) is a unit of power. One kilocalorie/hour equals 1.162222222 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

What is 15 Watt in Kilocalorie/Hour?

15 Watt equals 12.90631 Kilocalorie/Hour.

How many Kilocalorie/Hour are in 1 Watt?

There are exactly 0.8604206503 Kilocalorie/Hour in 1 Watt. This means the conversion factor from Watt to Kilocalorie/Hour is 0.8604206503.

What is the formula to convert Watt to Kilocalorie/Hour?

The formula to convert Watt to Kilocalorie/Hour is: kcal/h = W × 0.8604206503. For example, to convert 10 Watt to Kilocalorie/Hour, you would multiply 10 by 0.8604206503.

What is a Watt?