BTU Calculator
Calculate heating and cooling BTU requirements for your room
Room Details
People generate ~600 BTU each
What is BTU?
British Thermal Unit (BTU) is the amount of energy needed to heat or cool 1 pound of water by 1°F. Higher BTU = more cooling/heating power.
BTU Requirements
Room Size
180 sq ft
1440 cubic feet
Cooling BTU Needed
4800 BTU/hr
0.40 tons
Recommended AC Size
6,000 BTU
Sun Exposure Adjustments
Sunny room: 5280 BTU
Shaded room: 4560 BTU
Heating BTU (Cold Climate)
6240 BTU/hr
Est. Monthly Energy Cost
$43.92
Based on 8 hours/day usage
AC Unit Sizing Guide:
• 100-150 sq ft: 5,000-6,000 BTU
• 150-250 sq ft: 6,000-8,000 BTU
• 250-400 sq ft: 8,000-12,000 BTU
• 400-550 sq ft: 12,000-14,000 BTU