Predicting the Mature Height of Your Foal
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 There are several methods that horse breeders and buyers use to predict the mature height of a horse from the time they are very young. None of these methods are 100% accurate, but they do give you some idea and have been used by horse lovers for centuries.

Mature Miniature Horses are measured differently than their bigger versions. The measurement is not to the withers, but to the last lowest mane hair (which can be fudged with creative clipping). Hoof length can also effect the height measurement a surprising amount.

There are 3 ways we have found to predict mature height:

Cannon Bone Formula

Mature Height of Miniature Horse = Length of cannon x 4  + 2
The first method can be used on a new foal. Give them a couple of days to 'unfold' and then take a "cannon bone" measurement from the dent in the knee to the hairline of the hoof. Multiply this measurement by 4, add 2, and you will get adult height for a miniature horse. For a big horse, use the measurement and translate it directly into Hands. (for example, 16" means 16HH). Measure in a straight line (don't follow the front contour of the leg, in other words). This should give you a good 'ballpark' figure.

Our baby from Turbolina measures at 7.5 inches.

There is a fun saying I have heard from more than one miniature horse owner that states your miniature is done growing when the tail hits the ground.

Height Consideration / Verification for Miniature Horses

Then, there is this chart that I first found on the Lost Spoke Ranch website:

 
Projected Mature Height  
28"
  
29"
  
30"
  
31"
  
32"
  
33"
  
34"
  
36"
 
Birth
  
18.20"
  
18.85"
  
19.50"
  
20.15"
  
20.80"
  
21.45"
  
21.95"
  
23.40"
 
One Month
  
19.60"
  
20.30"
  
21.00"
  
21.70"
  
22.40"
  
23.10"
  
23.80"
  
25.20"
 
Two Months
  
21.56"
  
22.33"
  
23.10"
  
23.87"
  
24.64"
  
25.41"
  
26.18"
  
27.72"
 
Three Months
  
22.40"
  
23.20"
  
24.00"
  
24.80"
  
25.60"
  
26.40"
  
27.20"
  
28.80"
 
Four Months
  
22.96"
  
23.78"
  
24.60"
  
25.42"
  
26.24"
  
27.06"
  
27.88"
  
29.52"
 
Five Months
  
23.52"
  
24.36"
  
25.20"
  
26.04"
  
26.88"
  
27.72"
  
28.56"
  
30.24"
 
Six Months
  
23.80"
  
24.65"
  
25.50"
  
26.35"
  
27.20"
  
28.05"
  
28.90"
  
30.60"
 
Seven Months
  
24.08"
  
24.94"
  
25.80"
  
26.66"
  
27.52"
  
28.38"
  
29.24"
  
30.96"
 
Eight Months
  
24.36"
  
25.23"
  
26.10"
  
26.97"
  
27.84"
  
28.71"
  
29.58"
  
31.32"
 
Nine Months
  
24.64"
  
25.52"
  
26.40"
  
27.28"
  
28.16"
  
29.04"
  
29.92"
  
31.68"
 
1 Year
  
25.20"
  
26.10"
  
27.00"
  
27.90"
  
28.80"
  
29.70"
  
30.60"
  
32.40"
 
Fifteen Months
  
25.76"
  
26.68"
  
27.60"
  
28.52"
  
29.44"
  
30.36"
  
31.29"
  
33.12"
 
Eighteen Months
  
26.32"
  
27.26"
  
28.20"
  
29.14"
  
30.08"
  
31.02"
  
31.96"
  
33.84"
 
Twenty-one Months
  
26.74"
  
27.70"
  
28.65"
  
29.61"
  
30.56"
  
31.52"
  
32.47"
  
34.38"
 
2 Years
  
27.16"
  
28.13"
  
29.10"
  
30.07"
  
31.04"
  
32.07"
  
32.98"
  
34.82"
 
Thirty Months
  
27.58"
  
28.57"
  
29.55"
  
30.54"
  
31.52"
  
32.51"
  
33.49"
  
35.46"
 
Thirty-Six Months
  
28.00"
  
29.00"
  
30.00"
  
31.00"
  
32.00"
  
33.00"
  
34.00"
  
36.00"
Chart is 90% accurate within 1/2" + or -
Reproduced and printed from the November 95 Minature Horse Association of Arizona Newletter. Submitted by Norm Mahler

 

Ground to Elbow Measurement

Another method that horse folks use is to measure from the ground to the elbow. Take this measurement and double it. That number is your final height at the withers.

    

 
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