How to weigh your horse without a scale

Knowing the weight of your horse is important for several things, such as feeding properly, administering medications or dewormer paste, and generally tracking the health of your horse.

Unfortunately, we don’t all have access to scales big enough for a horse, so most horse owners end up using a traditional weight tape to measure their horse. While better than nothing, using a weight tape to measure your horse can be somewhat inaccurate at best. So, what’s a horse owner to do?

Try this: Using a seamstress tape, measure the length of your horse, and then around their girth, all in inches. Put those measurements in to this formula:

(Heartgirth x heartgirth x body length) / 330 = Weight of horse

If you have a mature horse, use that “330″ number. If you have a yearling, use “301″, and if you have a weanling, use “280.” And last but certainly not least – have a pony?  Use “299″ to get the right weight.

To see a demonstration, watch our YouTube video on how to measure your horse without a scale:

To download printable versions of the formula for calculating the weight of your horse without a scale, click here.

This entry was posted in Horse Nutrition, How To, Weight Control.
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13 Responses to How to weigh your horse without a scale

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  2. Elaine Blood says:

    Nutrena has horse weight tapes on their website that are super easy to read and use. It is kinda hard to find these tapes around here that are long enough and easy enough to read, but Nutrena has them and they are great!

    • Gina T. says:

      Hi Elaine, Thanks for the kudos! We do really like our weight tapes – they have the formula printed right on them, and are in inches, so they work great for this method. If anyone is interested in ordering them, they can be found on our e-store at http://www.nutrenacompanystore.com.
      Thanks ~ Gina T.

  3. Linda Leeper says:

    I’m trying to use the formula posted here for “weighing your horse without a scale,” but am coming out with some strange numbers, i.e.
    heart girth 35″
    body length 72″
    Following the formula given, (35 x 35 x 72)/330 = weight, I get 267.27273. In other words, 35 multiplied by 35 multiplied by 72 divided by 330.
    Obviously, something is wrong–I think this horse weighs around 1300.’ I tried it with another horse heart girth 32, body length 63 , and also got impossible results. Am I misinterpreting the formula somehow? Help!

    • Gina T. says:

      Hi Linda, Thanks for checking in with us! I was confused for a moment as well – you are doing the math properly – but then I realized that your measurement numbers are off for the heartgirth. The heartgirth measurement needs to be all the way around his belly – not just one side. The number you gave, 35, is about half of what a typical heartgirth is, so I think that’s where the problem lies. If I do the math with your heartgirth measurement doubled to 70, then his weight comes out at 1069 lbs. Does that make sense? Please do let us know if you have any further questions! ~ Gina T.

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  5. Well explained, I was glad you showed different figures for different horses, as such I can apply it to my Miniature Horses

  6. Rebecca Hagan says:

    Three accurate equations for estimating body weight of the miniature horse by the Kentucky Equine Research staff.

    http://www.miniaturehorsetalk.com/index.php?showtopic=68428

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  8. angela says:

    why is this formula considered better than a regular weight tape? Is it more accurate? Is a traditional weight tape created by using this formula for a mature horse? or How is a traditional tape created.
    thank your

    angela

    • Gina T. says:

      Hello Angela, The traditional weight tape was created many years ago, and is based on a simple formula that estimates weight according to how big around the horses girth is. This new formula was developed by researchers at Texas A&M in 1983, and estimates weight based on girth and length measurements, resulting in a much more accurate number. It’s much like human measurements – if you have two people with the same size waist, but one is 5 feet tall and the other is 6 feet tall, they are going to weight different amounts. Including the length of the horse (or the height of the human) gives a much more accurate representation.
      Thanks ~ Gina T.

  9. Susan Cannon says:

    What about Draft horses? What number would be used to divide the multiple of the heartgirth x 2 x length?

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