BTU Calculator: AC & HVAC
Room Size & Unit Sizing
About
Calculate the correct BTU and tonnage for your AC or heating unit based on room dimensions, insulation, sun exposure, and occupants. Get an adjusted recommendation and see how each factor influences the final sizing. Supports both imperial and metric units.
What's New in BTU Calculator
1.0.7
March 14, 2026
Improved App Store listing.
Developer apps
FAQ
What is BTU Calculator?
BTU Calculator is a utility app designed to help users determine the correct BTU and tonnage for their air conditioning or heating units. It considers various factors like room dimensions, insulation, and sun exposure to provide an accurate recommendation.
How does BTU Calculator determine the right unit size?
It takes into account room dimensions, ceiling height, insulation quality, sun exposure, the number of occupants, and whether it's a kitchen. These factors are used to adjust a base BTU recommendation, providing a precise tonnage rating for HVAC shopping.
Does BTU Calculator work offline?
Yes, BTU Calculator works offline, meaning you do not need an internet connection to use its features. This makes it convenient for use in various locations without worrying about connectivity.
Can I use BTU Calculator with different measurement systems?
Yes, the app supports both Imperial (feet, BTU) and Metric (meters, watts) units. This flexibility allows users worldwide to utilize the calculator according to their preferred measurement standards.
Is BTU Calculator free to download?
BTU Calculator is free to download and use. There is no sign-up required, and no paywalls or in-app purchases to access its core functionality.
Does BTU Calculator have ads?
Yes, BTU Calculator contains advertisements. As it is free to download and offers its features without a paywall, advertisements are included to support the app's development and maintenance.
What is the age rating for BTU Calculator?
BTU Calculator has an age rating of 4+. This indicates it is suitable for users of all ages and does not contain content inappropriate for children.
How often is BTU Calculator updated?
The latest version of BTU Calculator is 1.0.7, which was last updated on March 14, 2026. Updates typically focus on improving functionality and reliability.
