BTU Calculator CalculatorScale.com
HVAC & EnergyASHRAE Air Conditioning Sizing

BTU Calculator

Estimate the exact cooling capacity and heating power (BTU/hr, Tons, kW) required for an air conditioner, heat pump, or furnace based on room size, ceiling height, occupants, insulation, and sun exposure.

Modify the values and click the calculate button to use

Room & Environmental Factors

Quick Presets:
Required HVAC Capacity

5,438 BTU / hr

Equivalent to 0.45 Tons of cooling (1.59 kW)
Recommended AC / Heat Pump Category:Small Window / Portable AC (5,000 – 8,000 BTU)
Base Floor Area BTU5,000 BTU
Ceiling Height Adjust+438 BTU
Occupancy Heat+0 BTU
Room / Kitchen Adjust+0 BTU

Standard Room Sizing & BTU Reference Chart

Room AreaCooling CapacityTonsTypical Space
100 – 150 sq ft5,000 BTU0.42 TonsSmall Bedroom
150 – 250 sq ft6,000 BTU0.50 TonsMedium Bedroom
250 – 350 sq ft8,000 BTU0.67 TonsMaster Bedroom / Studio
350 – 550 sq ft12,000 BTU1.00 TonLiving Room / Large Studio
550 – 1,000 sq ft18,000 BTU1.50 TonsOpen Living & Dining Space
1,000 – 1,500 sq ft24,000 BTU2.00 TonsApartment / Small House
1,500 – 2,000 sq ft30,000 BTU2.50 TonsMedium House
2,000 – 2,500 sq ft36,000 BTU3.00 TonsLarge Single-Family Home
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