BTU Calculator
Heating and cooling capacity needed for a room.
m
m
m
Cooling capacity
6,720BTU/hr
In kilowatts
1.97kW
Room volume
48m³
Floor area
20m²
ShowHide the working
- 1Volume = 48 m³
- 2× 140 BTU/m³, adjusted for avg sun
- 3+ 0 BTU for extra occupants = 6,720 BTU/hr
Formula
BTU ≈ volume × 140 × sun factor + occupantsHow it works
Estimates the air-conditioner size a room needs, adjusted for sun exposure and the number of people.
Example
A 5 × 4 m room with a 2.4 m ceiling needs about 6,700 BTU/hr.
A rough guide only. Insulation, windows and climate all matter — get a professional heat-load survey for a real install.
About the BTU Calculator
Heating and cooling capacity needed for a room. It sits in the Home & Construction section of NWS Calc, a free collection of calculators that run entirely in your browser. There is no signup, no paywall and no tracking — open the page, enter your numbers, get an answer.
Frequently asked questions
- Is the BTU Calculator free to use?
- Yes. Every calculator on NWS Calc is completely free, with no signup, no usage limits and no ads.
- Does my data leave my device?
- No. The BTU Calculator runs entirely in your browser using JavaScript. Nothing you type is uploaded, logged or stored on a server.
- Can I use the BTU Calculator on my phone?
- Yes. The page is fully responsive and works in any modern mobile or desktop browser — there is nothing to install.
- What else is in Home & Construction?
- Paint, tile, concrete, flooring, lumber and material estimates. You can browse the full Home & Construction category for related calculators.