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BTU Calculator

HVAC sizing for a room.

AC / heat BTU sizing

Recommended BTU
5,000 BTU/hr
25 BTU per ft² × 200 ft²
Tons of cooling
0.42
1 ton = 12,000 BTU/hr (HVAC convention)
Watts equivalent
1,465 W
Useful for portable AC ratings
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BTU Calculator · Generated 5/2/2026 · calccenter.online/calculators/other/btu

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About the BTU Calculator

MethodologyHome

HVAC sizing for a room. Use this free btu calculator to get instant results. All calculations run in your browser — nothing is sent to a server.

Frequently asked questions

What does this BTU Calculator do?

HVAC sizing for a room.

Is it free?

Yes — every calculator on Calc Center is free, with no sign-up or account required.

Does it work offline?

The site is a Progressive Web App — after your first visit, most pages work without an internet connection.