BTU Calculator

Use these free calculators to estimate the number of BTUs (British Thermal Units) needed to cool or heat a room or house based on its size, insulation, and other conditions.

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AC BTU Calculator (for Cooling)

Estimate the cooling power needed for a specific room or an entire house.

Room Size

 square meterssquare feet

Ceiling Height

 metersfeet

Number of People Inside Regularly

Room Type Bedroom Living Room Kitchen Entire House

Insulation Condition Good (well-sealed, few windows) Average Poor (drafty, many windows)

Sun Exposure Heavily shaded Average Very sunny

Calculate

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General Heating or Cooling BTU Calculator

A general purpose calculator for estimating the BTUs needed to change the temperature of a space.

Room/House Width

 metersfeet

Room/House Length

 metersfeet

Ceiling Height

 metersfeet

Insulation Condition Good Average Poor

Desired Temperature Change

 CelsiusFahrenheit

Calculate