Power rate using BTU per hour.
BTU per hour to Milliwatts Converter — BTU/h to mW
Convert BTU per hour (BTU/h) to Milliwatt (mW) using the exact conversion factor (1 btu per hour = 293.0710702 milliwatt). See the formula, worked examples, and conversion table.
BTU per hour to Milliwatts converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
Milliwatt is 0.001 watt units.
Result = input x 0.2930710702 / 0.001.
Power units are compatible.
Reserved above the conversion cards and below the converter.
About Converting BTU per hour to Milliwatts
BTU per hour and Milliwatt both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Specifically: Power rate using BTU per hour, and milliwatt is 0.001 watt units.
Formula
milliwatts = btu per hour × 293.071070172
This factor comes from each unit's defined relationship to the category's base unit: 1 btu per hour equals 0.293071070172 base units, and 1 milliwatt equals 0.001 base units, so dividing one by the other gives the direct btu per hour-to-milliwatt factor of 293.071070172.
Simple example
1 BTU/h × 293.0710702 = 293.0710702 mW
1 btu per hour = 293.0710702 milliwatts.
Real-world example
100 BTU/h × 293.0710702 = 29,307.10702 mW
100 btu per hour = 29,307.10702 milliwatts.
Conversion table
| BTU per hour (BTU/h) | Milliwatt (mW) |
|---|---|
| 1 BTU/h | 293.0710702 mW |
| 10 BTU/h | 2,930.710702 mW |
| 50 BTU/h | 14,653.55351 mW |
| 100 BTU/h | 29,307.10702 mW |
| 500 BTU/h | 146,535.5351 mW |
| 1,000 BTU/h | 293,071.0702 mW |
Reverse conversion: Milliwatt to BTU per hour
293.0710702 mW × 0.003412141633 = 1 BTU/h
293.0710702 milliwatts = 1 btu per hour.
btu per hour = milliwatts × 0.00341214163313
For a page dedicated to this direction, see Milliwatt to BTU per hour.
Understanding the BTU per hour (BTU/h)
Power rate using BTU per hour.
Understanding the Milliwatt (mW)
Milliwatt is 0.001 watt units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many milliwatts are in 1 btu per hour?
1 btu per hour equals 293.0710702 milliwatts, using the exact defined conversion factor rather than an estimate.
How do I convert btu per hour to milliwatt?
Multiply the btu per hour value by 293.0710702. The converter above does this instantly to whatever precision you set.
How do I convert milliwatt back to btu per hour?
Use the reverse factor: 1 milliwatt equals 0.0034121416 btu per hour. You can also use the swap control in the converter above to flip the direction instantly.
What is a btu per hour?
BTU per hour (BTU/h) is a unit of engineering.
What is a milliwatt?
Milliwatt (mW) is a unit of engineering.
Is the btu per hour to milliwatt conversion exact?
Yes. Both btu per hour and milliwatt are defined by fixed standards rather than physical artifacts, so the factor of 293.0710702 used above is exact to as many digits as you choose to display.
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.