BTU Calculator

Use this calculator to estimate the cooling needs of a typical room or house, such as finding out the power of a window air conditioner needed for an apartment room or the central air conditioner for a house.

AC BTU Calculator

Size:

Room Ceiling Height:

Number of People Inside Regularly:

Type:

Insulation Condition:

Sun Exposure:

Climate:

General Purpose AC or Heating BTU Calculator

This is a general purpose calculator that helps estimate the BTUs required to heat or cool an area. The desired temperature change is the necessary increase/decrease from outdoor temperature to reach the desired indoor temperature. As an example, an unheated Boston home during winter could reach temperatures as low as -5°F. To reach a temperature of 75°F, it requires a desired temperature increase of 80°F. This calculator can only gauge rough estimates.

Room/House Width:

Room/House Length:

Ceiling Height:

Insulation Condition:

Desired Temperature Increase or Decrease: (e.g., 75°F for Boston winter, 45°F for Atlanta winter)