Is this calculation free and private?

Yes, 100% of calculations execute locally in your web browser. No inputs or personal data are stored or transmitted.

What does the HVAC Cooling Tonnage & BTU Size Calculator give me?

It works out Required Cooling Capacity and Recommended AC Size, updating live as you change the inputs.

What do I need to enter?

Just Home Living Area, Ceiling Height, Climate and Number of Regular Occupants. Every field has a sensible default you can start from.

Is my data uploaded anywhere?

No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.

Does it work on a phone?

Yes. The layout adapts to small screens and needs no app or signup.

HVAC Cooling Tonnage & BTU Size Calculator

Calculate necessary central air conditioner cooling capacity in BTU and Tons based on home square footage.

100% free
Private in browser
No signup
No watermarks

Home Living Area (Sq Ft)

Ceiling Height (Feet)

Climate (1.0=Moderate, 1.1=Warm, 1.25=Hot Sunbelt)

Number of Regular Occupants

Required Cooling Capacity (BTU/hr)

49,600

Recommended AC Size (Tons)

4.1

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About HVAC Cooling Tonnage & BTU Size Calculator

Calculate necessary central air conditioner cooling capacity in BTU and Tons based on home square footage. Enter Home Living Area, Ceiling Height and Climate and the tool works out Required Cooling Capacity and Recommended AC Size straight away. Everything runs in your browser, so your data never leaves your device.

How to use HVAC Cooling Tonnage & BTU Size Calculator

Enter Home Living Area, Ceiling Height and Climate.
Adjust the remaining options (Number of Regular Occupants) to match your case.
Read Required Cooling Capacity and Recommended AC Size in the results panel — copy or download what you need.

Key features

Shows Required Cooling Capacity (BTU/hr)
Shows Recommended AC Size (Tons)
4 adjustable inputs, results update as you type
No signup, no limits
Runs entirely in your browser — nothing is uploaded

Frequently asked questions

Is this calculation free and private?: Yes, 100% of calculations execute locally in your web browser. No inputs or personal data are stored or transmitted.
What does the HVAC Cooling Tonnage & BTU Size Calculator give me?: It works out Required Cooling Capacity and Recommended AC Size, updating live as you change the inputs.
What do I need to enter?: Just Home Living Area, Ceiling Height, Climate and Number of Regular Occupants. Every field has a sensible default you can start from.
Is my data uploaded anywhere?: No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.
Does it work on a phone?: Yes. The layout adapts to small screens and needs no app or signup.

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