AC Tonnage Calculator

Everyday Life

The AC Tonnage Calculator suggests an air-conditioner size for a room from its floor area and how much sun it gets. It applies a sun-exposure factor to the room size and rounds to the nearest standard AC capacity (in tons), giving you a quick starting point for choosing a unit.

Formula

Tonnage = (Room Size × Sun Factor) ÷ 600
  • AC Tonnage Calculator gives you a fast estimate using your inputs and updates instantly when you change any value.
  • Formula: Tonnage = (Room Size × Sun Factor) ÷ 600
  • Input definitions: • Room Size (square feet): the numeric room size (square feet) used in the calculation
  • Enter values using the units shown next to each input. Common units such as litres, kg, and minutes are labelled.
  • Based on widely accepted formulas for everyday use. Actual results may vary with individual circumstances.
  • Use the result as a practical estimate. Adjust inputs to explore different scenarios.
  • Practical tip: test a low, medium, and high scenario to understand sensitivity before making decisions.

Example Calculation

Inputs
  • Room Size (square feet): 300
  • Sun Exposure: moderate

For a 300 sq ft room with moderate sun, 300 × 0.8 ÷ 600 = 0.4 tons, which rounds to the nearest standard size of 0.75 Ton.

Frequently asked questions

What does this calculator recommend?
It suggests a standard air-conditioner size (in tons) for a room based on its floor area and how much direct sun it receives.
How does sun exposure change the result?
Rooms with more direct sun gain more heat, so a higher exposure setting increases the recommended tonnage for the same floor area.
Why is the result rounded?
Air conditioners are sold in standard capacities (0.75, 1, 1.5 tons, and so on), so the estimate is rounded to the nearest available size.
Is this exact?
No. It is a quick guide. For a precise specification, a technician should perform a full load calculation that includes insulation, ceiling height, and climate.
What if my room is between sizes?
When in doubt between two sizes, consider insulation and occupancy; a well-insulated, lightly used room can usually take the smaller unit.