How to Measure the Square Footage of a Roof

Learn how to measure the total square footage of a residential steep-slope house roof.

38 Replies

  1. Bee Creative Reply

    6:40 that's wrong, you have to get the slope and multiply by the sloped length, not the projection

  2. Juan Castellon Reply

    Awesome.hey what's up buddy.i have a cuestion .how many bags of ridge are on 92 feet.

  3. None Reply

    Ben this video most definitely refresh my memory, I almost grab my pen and paper and started to make up my own measurements 😂😂. Thank you for making this video. Very easy. Very simple

  4. sean delgado Reply

    So the software that I'm using is Sky measure powered by core logic, so 80% of U.S. homes sold are included in property imagery, averaging 9 images per home so more than likely it could definitely save you time and money their fees vary I haven't paid but 40$ per home we've done, but it saves a ton of time in the long run they also have an app for easy login access

  5. sean delgado Reply

    This works in simple roofs like a shed roof home but when you have gables and eves and rakes it's tougher I use this sky measure software whe 're you pay 40 to get the aerial Square footage of a home only thing it's not always guaranteed if there's alot of trees covering the home that's the only disadvantage

  6. Phil Masry Reply

    Thank you so much Ben! IT's so easy and to the point!

  7. Shofiq Ali Reply

    Good evening sir
    Thank you for demonstration & it will help me a lot you doing very your good job,keep up your demonstration & tutorial thank you,

  8. HardGamer Reply

    Nice video keep it up this video was crystal clear on how to learn to estimate a roof. Thank you

  9. J B Reply


  10. Mick Mac Reply

    There is no need for this complexity in calculating the area – it is simply
    60x10x2 = 1200
    20x10x2 = 400
    10x5x2 = 100
    6x5x0.5×8 = 120
    Total 1820
    It is hard to believe that home inspectors would need training on such a basic estimation.

  11. Allen Washburn Reply

    You also don't mention starter shingles and roof caps so whoever uses this as a home owner to attempt to do his roof will be short.

  12. Dan Simmons Reply

    very straightforward and professionally done. Bravo ! kiss

  13. Samitha Bandara Reply

    Don we consider the roof angle when measuring roof.. 45 deg, 30 deg.. like that.

  14. syed hussain Reply

    Just one thing didn't mention adding wast percentage for different roofs different percentages

  15. hotzpacho Reply

    when it comes to the roof measurements what is the most efficient way of measuring the length, width, and or height of each side of those shapes?

  16. Mick Mac Reply

    The calculation is not A1, A2 and A3 is not as complex as described. It is simply 60x10x2, 20x10x2 and 5x10x2 or 2100 total. No need to add and subtract the common triangles.

  17. Dannie Strable Reply

    Why couldnt you measure the A1 and measure A3 as LxW and not subtract two triangles per gable?

  18. Jeff W Reply

    Ben, when you show the East gable at 6:08 in the video you explain the base as 2 different lengths. Why do you show 10 foot and 16.3 and not just a 3rd line showing 26.3 length total. This looks confusing when looking at the roof design. So what your saying is that from the edge of the main roof to the end of the gable is 10ft and the triangular portion length is 16.3 feet? why would you double a length just to subtract the triangular portion. Couldn't you just measure the triangular parts of the roof and do it separately? Then subtract the triangular portion from the main portion of the house? it confuses me how you take two lengths add them together then do your base X height X 1/2. Please let me know why its done this way

  19. Michael White Reply

    Measuring the area of the house footprint will not work. You also need to add in your overhangs of eaves and rakes, then it will work. You could cost someone thousands of dollars by making this simple mistake. have a good day.

  20. Matt Nelson Reply

    Nick, multiplying something by 1/2 or dividing by 2 equals the same number… Example : 100 divided by 2 = 50 or 100 x .5 (1/2) = 50… So, you can do it either way…

  21. Nick Jumpa Reply

    Yes expanding on what Eric Brennan Said when talking about trapezoid in the beginning you said Base 1+Base 2 divided by 2 at the end you in the final summary of all the calculations it says Base 1 + Base 2 x 1/2 and at the end you say the same thing but it shows Base 1+Base 2 divided by 2. Which one is it? Can you please correct this or can someone comment or leave a video note?

  22. RoofLogic Reply

    A software package has been developed to make such measurements. But knowing how to do this manually is necessary. Knowing the basics first is necessary in any profession.

  23. Willis Fitnurbut Reply

    You said multiply several times for the trapezoid measurement when it's actually dividing by 2.