AC size calculator
Use our ac size calculator to calculate accurate size and measurement values instantly.
Calculator
Estimate cooling load from floor area and convert to tons of refrigeration.
Formula: BTU/h = area(ft^2) x load factor; Tons = BTU/h / 12000
What each field means
- Room Area (ft2): Enter a valid value for this field.
- Load Factor (BTU/h per ft2): Example: 20
Estimated AC Capacity
Your result will appear here.
About AC size calculator
The AC size calculator helps you estimate AC and HVAC values quickly using consistent assumptions and practical calculation rules.
Formula Explanation
BTU/h = area(ft^2) x load factor; Tons = BTU/h / 12000
Inputs You Need
- Required measurement values relevant to this calculator
- Unit selection: Room Area (ft2), Load Factor (BTU/h per ft2)
- Optional tolerance, safety, or scenario values if applicable
Step-by-Step Usage
- Enter your known values in the calculator fields.
- Select units and options that match your scenario.
- Click Calculate to generate your output.
- Copy, save, or share the result for later reference.
Example
Run the tool with realistic values from your use case and compare the output against expected ranges for AC and HVAC calculations.
Method Sources
- https://en.wikipedia.org/wiki/British_thermal_unit
- https://en.wikipedia.org/wiki/Ton_of_refrigeration
Frequently Asked Questions
Is this AC size calculator accurate?
Yes, when correct inputs and units are provided.
Which units does this calculator support?
This tool is optimized for Room Area (ft2), Load Factor (BTU/h per ft2).
Can I use this calculator on mobile?
Yes, the form is optimized for touch inputs and smaller screens.