Construction Calc Lab

HVAC · Calculator

AC Tonnage Calculator

Estimate cooling capacity from floor area and a user-selected cooling load intensity.

Project inputs

Enter your project values, then press Calculate.

How this calculator works

Estimate cooling capacity from floor area and a user-selected cooling load intensity.

BTU/h = area × load intensity; 1 ton = 12,000 BTU/h

How to use the AC Tonnage Calculator

1. Enter project inputs

  • Conditioned floor area (ft²)
  • Cooling load intensity (BTU/h·ft²)

2. Review the results

  • Cooling load
  • Cooling capacity
  • Cooling capacity

3. Check the calculation

The calculator uses the following core relationship:

BTU/h = area × load intensity; 1 ton = 12,000 BTU/h

Sizing note: HVAC results are preliminary estimates and should be verified against a project-specific load calculation and manufacturer data.

AC Tonnage Calculator Guide

An AC tonnage calculator estimates air conditioner capacity from cooling requirements.

Calculation formula

AC Tonnage = Required BTU ÷ 12000

Estimation tips

Professional HVAC design may consider additional heat sources.

Engineering note: Use these calculations for estimation and planning. Always confirm final designs according to project requirements and applicable standards.

AC Tonnage Calculator FAQ

What does the AC Tonnage Calculator calculate?

Estimate cooling capacity from floor area and a user-selected cooling load intensity.

What information do I need to use the AC Tonnage Calculator?

The calculator uses inputs such as Conditioned floor area (ft²), and Cooling load intensity (BTU/h·ft²). Use values from your drawings, measurements, product data, or project specifications.

How should I use the results from the AC Tonnage Calculator?

Use outputs such as Cooling load, Cooling capacity, and Cooling capacity as an early sizing estimate. Final HVAC selection should account for climate, envelope performance, ventilation, occupancy, equipment data, and a project-specific load calculation.