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HVAC & Airflow

CFM to MMBtu Calculator

Convert airflow heating/cooling duty to MMBtu/hr.

Enter your values

ⓘ Live results

Results
Duty
0.216 MMBtu/hr
In BTU/hr
216,000
In tons (if cooling)
18

Quick answer

Airflow heating or cooling duty in MMBtu/hr equals 1.08 x CFM x temperature difference, divided by one million.

MMBtu/hr = (1.08 x CFM x dT) / 1,000,000

How to use the CFM to MMBtu Calculator

  1. 1Enter the system's airflow in CFM.
  2. 2Enter the temperature difference across the coil or heater.
  3. 3The result converts sensible BTU/hr directly to MMBtu/hr (millions of BTU per hour).

Worked example

Using the values the calculator loads with:

Inputs

  • Airflow5000 CFM
  • Temperature difference40 F

Results

  • Duty0.216 MMBtu/hr
  • In BTU/hr216,000
  • In tons (if cooling)18

Frequently asked questions

When would I use MMBtu instead of BTU?

MMBtu is common in utility billing, boiler plant capacity and large commercial/industrial energy accounting.

Does this include latent heat?

No — this is sensible heat only; add latent load separately for full cooling/heating duty.

About this calculator

Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.