HVAC Unit Converter (BTU, Tons, Watts, CFM, Pressure)
Convert a European spec sheet or a metric gauge reading on the spot, without leaving the job to find a second app.
Cooling Tonnage vs. BTU & Airflow CFM Chart
Quick reference guide for nominal residential and commercial equipment:
| Nominal Tonnage | Cooling Capacity (BTU/hr) | Electrical Power Equivalent (kW) | Target Standard Airflow (CFM) |
|---|---|---|---|
| 1.0 Ton | 12,000 BTU/hr | 3.52 kW | 400 CFM |
| 1.5 Tons | 18,000 BTU/hr | 5.28 kW | 600 CFM |
| 2.0 Tons | 24,000 BTU/hr | 7.03 kW | 800 CFM |
| 2.5 Tons | 30,000 BTU/hr | 8.79 kW | 1,000 CFM |
| 3.0 Tons | 36,000 BTU/hr | 10.55 kW | 1,200 CFM |
| 3.5 Tons | 42,000 BTU/hr | 12.31 kW | 1,400 CFM |
| 4.0 Tons | 48,000 BTU/hr | 14.07 kW | 1,600 CFM |
| 5.0 Tons | 60,000 BTU/hr | 17.58 kW | 2,000 CFM |
| 7.5 Tons | 90,000 BTU/hr | 26.38 kW | 3,000 CFM |
| 10.0 Tons | 120,000 BTU/hr | 35.17 kW | 4,000 CFM |
HVAC Units & Conversions FAQ
Why is 1 Ton of refrigeration defined as 12,000 BTU/hr?
One ton of refrigeration represents the amount of heat energy required to melt 2,000 pounds (one short ton) of ice at 32°F in 24 hours (2,000 lbs × 144 BTU/lb latent heat of fusion = 288,000 BTU / 24 hrs = 12,000 BTU/hr).
What is the difference between CFM and FPM?
CFM (Cubic Feet per Minute) measures total air volume flow rate. FPM (Feet per Minute) measures the linear velocity or speed of the air moving through a duct or grille (Velocity FPM = CFM / Area in sq. ft.).
Is this unit converter in the ACLogics app?
Yes. Open Tools → Unit Converter in the ACLogics app for iPhone and Android. Choose the starting and target units, then check the unit labels before you record the result.
Field Tools
Keep the converter in the same app as the diagnosis.
Download ACLogics free for iPhone and Android. No credit card needed. Convert units, check ducts, look up error codes and diagnose equipment from one app.