Classic tool
Air Conditioner BTU Calculator
Estimate the right air conditioner BTU size from room area, ceiling height, sun exposure, people and kitchen use.
Use this air conditioner BTU calculator when you want a faster way to size a room AC before you buy, replace or compare models. It starts with room area and then adjusts the estimate for ceiling height, sunlight, occupancy and kitchen use so the recommendation feels closer to real life.
Enter the room size, choose square meters or square feet, add the ceiling height and tell the tool whether the room gets strong sun or works as a kitchen. The result shows an estimated cooling load in BTU per hour, a standard market size to shop for and quick conversions to kilowatts and tons of refrigeration.
This makes it easier to avoid undersized units that struggle to cool and oversized units that may cost more than necessary. Very open layouts, poor insulation and whole-home projects still deserve an on-site load calculation from a professional.
Use clear inputs to get a more useful result.