I hope this will be useful to everyone Here's a formula for working out horse's weights in case you can't pack up horse and float and go to a weigh bridge... Girth measurement squared x Length and then divide by 11,877 EQUALS your horse’s estimated weight in kilos Here's a pic to guide you where to measure from. I don't know what happened to the worming thread as I can only assume that something 'inappropriate' happened and it was nuked (or Im going blind) so I thought I'd just repost the formula in case it helps anyone.

G cm X L cm X 75= weight in kg's. Daily food intake is 2.5 divide 100 X weight.... G means girth L means length This is another way to find out the weight of your horse Sorry to add this to your thread, i find this method easier to calculate

I have found that the conventional weight tape is pretty acurate too. Available from Horseland for under $10

Lol that is my method too Formula, mathmatics I was out in the paddock with my horse when I was in math classes*#)

Yup, the tapes are pretty close... my little tacker comes up as 586kg on a tape...and was only 613kg on the scales...so i'd say thats a reasonable margin of error...

Saddleworld in Maddington are giving away weight tapes if you buy two horse wormers.. Yeah something for Free!!!

Has anyone compared the formula to the tape yet to see which came up more accurate? I haven't, I really ought to do it as I've done the formula but haven't tried the tape yet. (really need to borrow float & find a weigh-bridge!)

Yes - researchers have compared different tapes and length-girth formulae with weigh-bridge recorded weights. The accuracy of the tape (or length-girth formulae) varies between tapes and horse size. PSO's experience of a 4.4% underestimation with a tape is not uncommon. I summarised some of these results in the winter issue of the Worm Watch newsletter. Anyone interested can send me their e-mail address and I'll send them a copy of the newsletter.

I have found the tape to be very accurate (I use Equimax brand) & yes I have compared to scale weights. Have only found that is is not entirely acurate with ponies (12 - 14 hands) & odd shaped horses or those with a particularly high wither. But I have found it to be slightly more accurate than the l/g formula on horses, & the l/g formula more accurate for ponies. Just my personal experience. I would like a copy of that newsletter but worm watch & have pm'd you! Thanks