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HVAC BTU Calculator

Calculate the correct cooling capacity (BTU) required for your room or space. Get accurate results and choose the right air conditioner size for maximum comfort and efficiency.

Print Results
Room Information
ft
ft
ft
Tip: For best results, use actual room measurements and select the sun exposure that best matches your room.
Calculation Results
Required Cooling Capacity
12,540 BTU
❄ Total BTU
Estimated AC Size
1.0 Ton
12,000 BTU (Closest Match)
Recommended AC Capacity
12,000 BTU
✔ Ideal for your room size

Results are estimates only. Actual requirements may vary based on insulation, windows, doors and other environmental factors.

How It Works
1
Enter your room dimensions.
2
Select the amount of sunlight.
3
Choose occupants and appliances.
4
Click Calculate BTU.
5
Choose the nearest AC capacity.
BTU Quick Guide
  • 150–250 sq.ft → 6,000 BTU
  • 250350 sq.ft → 8,000 BTU
  • 350–450 sq.ft 10,000 BTU
  • 450–550 sq.ft → 12,000 BTU
  • 550–700 sq.ft → 14,000 BTU

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Instant Results

Get an accurate BTU estimate in seconds using industry-standard HVAC calculations.

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Accurate Sizing

Considers room dimensions, ceiling height, occupants and sun exposure.

Save Energy

Properly sized equipment runs more efficiently and lowers operating costs.

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Professional Formula

Based on common HVAC sizing practices used by technicians and contractors.