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AC Tonnage Calculator
HVAC Manual J–based sizing · Enter room details to find the right cooling capacity
Room Dimensions
Length
ft
m
Width
ft
m
Ceiling Height
Standard is 8 ft / 2.4 m
ft
m
Room Type
Bedroom / Living Room
Office / Study
Kitchen (+4,000 BTU)
Gym / Workshop (+2,000 BTU)
Dining Room (+1,500 BTU)
Server / Equipment Room
Climate & Environment
Climate Zone
Very Cool (18 BTU/sq ft) — e.g. UK, Canada, Scandinavia
Cool (20 BTU/sq ft) — e.g. Northern Europe, Seattle
Moderate (22 BTU/sq ft) — e.g. Northern India, mild US
Warm & Humid (25 BTU/sq ft) — e.g. Mumbai, Bangkok, Florida
Hot (28 BTU/sq ft) — e.g. Delhi plains, Middle East, Texas
Very Hot & Dry (32 BTU/sq ft) — e.g. Rajasthan, Phoenix, Gulf
Sun Exposure
Heavy Shade (−10%)
Average / Mixed
South/West Facing (+15%)
Very Sunny / Lots of Glass (+25%)
Insulation Quality
Excellent (New construction, −15%)
Good (Modern home, −5%)
Average
Poor (Older building, +15%)
Very Poor (No insulation, +25%)
Floor Location
Ground / Middle Floor
Top Floor / Under Direct Roof (+10%)
Basement (−5%)
Occupants & Openings
Number of Occupants
First 2 are included in base load
−
+
Number of Windows
First 2 windows in base load
−
+
Exterior Doors
+1,000 BTU each
−
+
Electrical Load (Watts)
Lights + appliances in room
⚡ Calculate AC Tonnage
How the calculation works
Base Load
Area × Climate BTU/sq ft factor
Ceiling Adj.
+10% per foot above 8 ft standard
Insulation
−15% (excellent) to +25% (no insulation)
Solar Gain
−10% shade to +25% very sunny
Occupants
+600 BTU/hr per person above 2
Windows
+1,000 BTU each above base of 2
Doors
+1,000 BTU per exterior door
Equipment
Electrical load × 3.41 BTU conversion
Fill in the room details
and tap
Calculate
