Unit System
Rounding
Thousands Separator
Recommended AC Power
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BTU/h
Power in All Units
BTU/h
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Kilowatts (kW)
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Watts (W)
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Cooling Tons
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Area in All Units
Square feet (ft²)
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Square meters (m²)
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Room Cooling Diagram
This calculator estimates air conditioner cooling capacity based on room area. Enter the room size in square feet or square meters, and the calculator returns the recommended AC power in BTU/h, kilowatts, watts, and cooling tons.
Formulas
PBTU = Aft² × 20
PW = Am² × 100
Where P is cooling power and A is room area. Standard rates: 20 BTU/h per ft² or 100 W per m².
Unit Conversions
1 BTU/h = 0.293071 W | 1 ft² = 0.092903 m² | 1 Ton = 12,000 BTU/h
Calculation Examples
| Room Area | BTU/h | kW | Cooling Tons |
|---|---|---|---|
| 150 ft² | 3,000 | 0.88 | 0.25 |
| 250 ft² | 5,000 | 1.47 | 0.42 |
| 400 ft² | 8,000 | 2.34 | 0.67 |
| 600 ft² | 12,000 | 3.52 | 1.00 |
| 15 m² | 5,118 | 1.50 | 0.43 |
| 25 m² | 8,530 | 2.50 | 0.71 |
| 40 m² | 13,649 | 4.00 | 1.14 |
| 60 m² | 20,473 | 6.00 | 1.71 |
| 1,000 ft² | 20,000 | 5.86 | 1.67 |
| 100 m² | 34,121 | 10.00 | 2.84 |
Note: These calculations use standard cooling rates (20 BTU/ft² or 100 W/m²) for typical room conditions. Actual AC requirements may vary based on climate, ceiling height, insulation, window exposure, and heat-generating equipment.