We searched on-line for about 4 seconds and found a conversion factor:
1 Kcal = 4186.8 joules (rounded)
That's all we need. Now all we have to do is multiply both sides of the equation by 750:
750 Kcal = (750) x (4186.8) = 3,140,100 joules (rounded)
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It isn't possible. Joules is the measure of energy and cm is a measure of distance.
1 BTU(ISO) = 1,054.5 Joules 1 Joule = 0.00094832 BTU(ISO) (rounded)
You don't, those units measure different things.
Horsepower is a unit of power, but joules is a unit of energy. To convert horsepower to joules, you need an additional time parameter. One horsepower is about 745.7 watts. So a horsepower-hour is 745.7 watt-hours. One watt-hour is 3600 joules. A horsepower-hour is then 745.7 times 3600 = 2684520 joules.
CMH is a unit of flow rate (m3/hr or cubic metres per hour) A BTU is a British Thermal Unit, a unit of energy that is equal to around 1055 joules. You cant convert the two as they are a measure of different things, but changing BTU (or Btu) to joules will help standardise the calculations.