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Calculate BTU needed to heat or cool a room from its dimensions. Use our free btu per room calculator online tool — instant results, no upload, completely private.
No account · No upload · No watermark · Works on any device
Navigate to the BTU Per Room Calculator tool — no download or installation needed.
Drop your file or paste your data. Everything stays in your browser, nothing is uploaded.
Processing happens instantly on your device. Download or copy your result.
Save time on everyday tasks
Work without installing software
Process files privately in your browser
Calculate heating and cooling load from room dimensions, insulation, and climate zone.
Calculate AC tonnage from room sqft, ceiling height, and sun exposure.
Calculate duct diameter from CFM and air velocity.
Calculate CFM required from room volume and air changes per hour.
No signup, no upload, 100% private. Works right in your browser on any device.
Open BTU/Room