How to calculate btus & watts

Written by bill brown
  • Share
  • Tweet
  • Share
  • Email

BTUs and watts are both units that measure types of power (energy expended over time). The term BTU typically refers to BTUs used over a period of time, such as an hour. For watts, the kilowatt hour is a standard unit used by energy companies (1,000 watts, or 10 light bulbs of 100 watts, used for one hour). You can calculate the number of BTUs in a given number of watts, and vice versa, using a conversion factor. The calculation of BTUs and watts is useful in heating, ventilation and air conditioning (HVAC) applications, among others.

Skill level:

Things you need

  • Calculator

Show MoreHide


  1. 1

    Calculate BTUs from watts by multiplying the number of watts by 3.414. If you have 2,000 watts, that would be 6,828 BTUs.

  2. 2

    Calculate watts from BTUs by dividing the number of watts by 3.414. If you have 5,000 BTUs, that is about 1,465 watts.

  3. 3

    Use this calculation to figure out the BTUs of a heating or air conditioning unit, given the watts, or the reverse, calculating the watts from a given number of BTUs.

Don't Miss

  • All types
  • Articles
  • Slideshows
  • Videos
  • Most relevant
  • Most popular
  • Most recent

No articles available

No slideshows available

No videos available

By using the site, you consent to the use of cookies. For more information, please see our Cookie policy.