How many milliwatthour in 1 horsepower hour? The answer is 745699.86111111. We assume you are converting between milliwatthour and horsepower hour. You can view more details on each measurement unit: milliwatthour or horsepower hour The SI derived unit for energy is the joule. 1 joule is equal to 0.27777777777778 milliwatthour, or 3.7250614122937E-7 horsepower hour. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between milliwatthour and horsepower hours. Type in your own numbers in the form to convert the units!
You can do the reverse unit conversion from horsepower hour to milliwatthour, or enter any two units below:
The SI prefix "milli" represents a factor of 10-3, or in exponential notation, 1E-3.
So 1 milliwatthour = 10-3 .
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