Air Conditioner Calculator
Find the right AC size for your room. Calculate BTU requirements and estimate energy costs.
Room Details
Recommended AC Size
4,000 BTU
0.33 Tons | Small Room (180 sq ft)
Room Area
180 sq ft
Room Volume
1440 cu ft
Energy Usage (8 hrs/day)
Power Consumption1,143 Watts
Daily Energy9.14 kWh
Monthly Energy274.3 kWh
Est. Monthly Cost$32.91
AC Type Recommendations
Based on 4,000 BTU:
- Window AC or Portable AC
How to Calculate AC Size
The basic formula is 20 BTU per square foot of living space. However, several factors affect the actual cooling needs:
- High ceilings require more cooling capacity
- Sunny rooms need 10% more BTU
- Add 600 BTU for each person beyond 2 occupants
- Kitchens require an additional 4,000 BTU
- Poor insulation increases cooling needs by up to 20%