MBH to kW Converter
The MBH to kW Converter converts MBH to kilowatts (kW): 1 MBH = 0.293071 kW, so 100 MBH equals 29.31 kW. Use the MBH to kW Converter to compare HVAC equipment ratings accurately, checking whether each figure represents input or output capacity.
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MBH to kW formula
kW = MBH × 0.29307107
MBH = kW ÷ 0.29307107
The factor is 0.29307107 kW for each 1 MBH. Going the other way, 1 kW is 3.4121416 MBH.
MBH to kW reference table
| MBH | kW |
|---|---|
| 12 | 3.51685 |
| 24 | 7.03371 |
| 36 | 10.5506 |
| 60 | 17.5843 |
| 100 | 29.3071 |
| 150 | 43.9607 |
| 250 | 73.2678 |
| 500 | 146.536 |
| 1,000 | 293.071 |
Where this conversion is used
MBH appears on US schedules for boilers, furnaces, heating coils, rooftop units and DX coils. Metric projects in India and the Gulf state the same capacities in kW. Use this conversion when you review a US equipment submittal or coil selection against a metric schedule. The M in MBH is the Roman numeral for one thousand, so 1 MBH is 1,000 BTU/hr and 12 MBH equals 1 TR.
Worked example
A hot water coil selection from a US supplier shows a heating capacity of 120 MBH and the project schedule is in kW.
120 MBH × 0.29307107 = 35.1685 kW
Enter about 35.17 kW in the schedule.
Common mistakes
- Reading MBH as one million BTU/hr. One million BTU/hr is written MMBH or MMBtu/hr.
- Treating MBH as plain BTU/hr, which gives a result 1,000 times too small.
- Mixing input and output ratings on boilers and furnaces. The input MBH of a burner is higher than the heat output it delivers.
Related HVAC Tools & Resources
Frequently asked questions
What does MBH mean in HVAC, and how do you convert it to kW?
MBH means 1,000 BTU per hour in HVAC. To convert MBH to kW heating capacity, multiply the MBH value by 0.293071. For example, 100 MBH equals approximately 29.31 kW.
Does MBH mean one million BTU per hour on HVAC equipment labels?
No, MBH usually means 1,000 BTU per hour, not one million. MMBtu is used for one million BTU. Check the equipment documentation to confirm the intended unit.
How many MBH equal one ton of refrigeration when comparing cooling capacity?
One ton of refrigeration equals 12 MBH, or 12,000 BTU per hour. Divide the MBH rating by 12 to convert it to refrigeration tons. For example, 36 MBH equals 3 TR.
What should an MBH to kW conversion calculator HVAC teams use provide?
It should apply the conversion factor of 0.293071 and display the result in kW. Check whether the original rating represents input, output, or delivered capacity before comparing equipment.
Can a cooling MBH to kW converter help compare air-conditioning equipment?
Yes, it converts the stated cooling capacity from MBH to kW. Check the manufacturer's rating conditions and confirm that the values being compared represent the same type of cooling capacity.
What should a boiler capacity MBH to kW calculation include?
Multiply the stated MBH rating by 0.293071 to obtain kW. Before comparing boilers, confirm whether the rating represents fuel input or heat output because these values are not interchangeable.
How do you convert rooftop DX coil ratings and hot-water coil capacity to kW?
Multiply the stated MBH capacity by 0.293071 to convert it to kW. The same factor applies to hot water coil MBH to kW conversion. Check the published ratings and design conditions before comparing equipment.
When converting furnace heat output from MBH to kW, which rating should you use?
Use the published heat-output rating when comparing delivered heating capacity. Do not substitute the fuel-input rating, as the two values differ according to the furnace's efficiency.
When reviewing US equipment submittals, why is unit conversion useful for HVAC teams?
US equipment submittals may express capacity in BTU per hour or MBH, while project schedules may require kW. Converting the units makes comparisons easier, provided the original ratings use the same capacity basis.
Does converting an HVAC capacity rating to kW confirm that equipment is correctly sized?
No, unit conversion changes the measurement unit but does not establish correct equipment sizing. Selection also depends on the required heating or cooling load, design conditions, and manufacturer performance data.