Convert Milliwatts (mW) to Btu/hour (Btu/h)

1 milliwatt equals 0.00341214 Btu/hour.

Formula: Btu/h = mW × 0.00341214

Milliwatt to Btu/hour Converter

How to Convert Milliwatt to Btu/hour

1 milliwatt = 0.00341214 Btu/hour

Btu/hour = Milliwatt × 0.00341214

Example: 1 mW × 0.00341214 = 0.00341214 Btu/h

Reverse Conversion

To convert Btu/hour back to milliwatts:

Remember, 1 Btu/hour equals 293.071 milliwatts.
To convert 0.00341214 Btu/h to mW, multiply 0.00341214 x 293.071, resulting in 1 mW.

Common Milliwatt to Btu/hour Conversions

Milliwatt to Btu/hour (Part 1)

Milliwatt to Btu/hour common conversions part 1
Milliwatt	Btu/hour	Actions
1 milliwatt	0.00341214 Btu/hour
5 milliwatts	0.0170607 Btu/hour
10 milliwatts	0.0341214 Btu/hour
25 milliwatts	0.0853035 Btu/hour

Milliwatt to Btu/hour (Part 2)

Milliwatt to Btu/hour common conversions part 2
Milliwatt	Btu/hour	Actions
50 milliwatts	0.170607 Btu/hour
100 milliwatts	0.341214 Btu/hour
500 milliwatts	1.70607 Btu/hour
1000 milliwatts	3.41214 Btu/hour

Milliwatts to Btu/hour Conversion Table

Reference table with common milliwatts to btu/hour conversions. All values calculated with high precision.

Milliwatts to Btu/hour Table
0.1 to 500

Milliwatts to Btu/hour conversion table, values from 0.1 to 500
Milliwatts	Btu/hour	Actions
0.1 mW	0.000341214 Btu/h
14 mW	0.000853035 Btu/h
12 mW	0.00170607 Btu/h
1 mW	0.00341214 Btu/h
2 12 mW	0.00853035 Btu/h
5 mW	0.0170607 Btu/h
10 mW	0.0341214 Btu/h
25 mW	0.0853035 Btu/h
50 mW	0.170607 Btu/h
100 mW	0.341214 Btu/h
250 mW	0.853035 Btu/h
500 mW	1.70607 Btu/h

Milliwatts to Btu/hour Table
1000 to 1 × 10⁸

Milliwatts to Btu/hour conversion table, values from 1000 to 1 × 10⁸
Milliwatts	Btu/hour	Actions
1000 mW	3.41214 Btu/h
2500 mW	8.53035 Btu/h
5000 mW	17.0607 Btu/h
10000 mW	34.1214 Btu/h
25000 mW	85.3035 Btu/h
50000 mW	170.607 Btu/h
100000 mW	341.214 Btu/h
250000 mW	853.035 Btu/h
500000 mW	1706.07 Btu/h
1000000 mW	3412.14 Btu/h
2500000 mW	8530.35 Btu/h
5000000 mW	17060.7 Btu/h
10000000 mW	34121.4 Btu/h
2.5 × 10⁷ mW	85303.5 Btu/h
5 × 10⁷ mW	170607 Btu/h
1 × 10⁸ mW	341214 Btu/h

Btu/hour to Milliwatts Table
0.0001 to 12

Btu/hour to milliwatts conversion table, values from 0.0001 to 0.5
Btu/hour	Milliwatts	Actions
0.0001 Btu/h	0.0293071 mW
0.00025 Btu/h	0.0732678 mW
0.0005 Btu/h	0.146536 mW
0.001 Btu/h	0.293071 mW
0.0025 Btu/h	0.732678 mW
0.005 Btu/h	1.46536 mW
0.01 Btu/h	2.93071 mW
0.025 Btu/h	7.32678 mW
0.05 Btu/h	14.6536 mW
0.1 Btu/h	29.3071 mW
14 Btu/h	73.2678 mW
12 Btu/h	146.536 mW

Btu/hour to Milliwatts Table
1 to 100000

Btu/hour to milliwatts conversion table, values from 1 to 100000
Btu/hour	Milliwatts	Actions
1 Btu/h	293.071 mW
2 12 Btu/h	732.678 mW
5 Btu/h	1465.36 mW
10 Btu/h	2930.71 mW
25 Btu/h	7326.78 mW
50 Btu/h	14653.6 mW
100 Btu/h	29307.1 mW
250 Btu/h	73267.8 mW
500 Btu/h	146536 mW
1000 Btu/h	293071 mW
2500 Btu/h	732678 mW
5000 Btu/h	1465360 mW
10000 Btu/h	2930710 mW
25000 Btu/h	7326780 mW
50000 Btu/h	1.46536 × 10⁷ mW
100000 Btu/h	2.93071 × 10⁷ mW

Definition of Milliwatt

Definition: SI multiple equal to one thousandth of a watt.
Exact factor: 1 mW = 10⁻³ W
Sources: BIPM — SI Brochure

Definition of Btu/hour

Definition: British thermal units per hour — rate of energy transfer, commonly used in heating and cooling systems.
Reference factor: 1 Btu/h = 0.29307107 W
Sources: EIA — Btu/h

About the Btu/hour

Facts & Uses

Standard power rating in HVAC (heating, ventilation, air conditioning) systems.
Air conditioners and furnaces are often rated in Btu/h or tons of refrigeration (1 ton = 12,000 Btu/h).
Useful for comparing cooling capacities or fuel efficiencies.

Curiosities

1 Btu/h = 0.293071 W — a 12,000 Btu/h air conditioner is roughly 3.52 kW.
MBH (1000 Btu/h) is a common shorthand in U.S. equipment specs.

Frequently Asked Questions

How many Btu/hour are in one milliwatt?

One milliwatt equals 0.00341214 Btu/hour. To convert, multiply the milliwatt value by 0.00341214. For the reverse, divide the Btu/hour value by 0.00341214 (or multiply by 293.071).

What is 2.7 × 10<sup>8</sup> milliwatts in Btu/hour?

2.7 × 10⁸ milliwatts = 921280 Btu/hour. This is one of the most commonly searched conversions for this pair.

How precise is the milliwatt-to-Btu/hour conversion?

The factor 0.00341214 is accurate to 6 significant figures, derived from international measurement standards. Our calculator uses full precision internally.

Looking for the reverse? Convert Btu/hour to Milliwatt

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Conversion factors verified against NIST, BIPM, ISO 80000-4 Based on SI base units (W = J/s, BIPM). Last reviewed: April 2026

By Adilson Fernandes

Reviewed by Tiago Fernandes

All unit conversions on CoolConversion use conversion factors defined or documented by internationally recognised standards bodies (such as ISO and NIST), including both SI and non-SI units.