What Size Air Conditioner Do I Need?

This quick size calculator will give you a quick estimation on the air conditioner size required to condition the area. For example if you would like to calculate the size of a split system air conditioner required enter the total floor area of the room in m2 where the indoor unit will be located. Then select the direction of the windows, if you have windows facing in two directions select the direction of the larger sized windows.

What Size Split System Air Conditioner?

Size of Room and Air Conditioner Output

Air conditioner outputs are measured in kilowatts (kW). Below is a guide for size of room vs air conditioner output needed.

Please remember the pro checklist above is very important and that the information below is a basic guide to get you started and working out a budget.

Size of room Size of Air Conditioner Needed
in m2

10m2    2.0kW – 2.5kW

15m2     2.5kW – 3.0kW

20m2     3.0kW – 3.5kW

25m2     3.5kW – 4.0kW

30m2     4.0kW – 4.5kW

40m2     4.8kW – 6.2kW

50m2     6.2kW – 7.2kW

60m2     7.2kW – 8.0kW

70m2     8.0kW – 10.5kW

To figure out the size of your rooms in m2…

Just count amount of (large) steps from one end of the room to the other and then count how many steps across the room. Multiply those numbers and you have approximate m2.

Example: 10 steps long x 5 steps wide = 50m2