22/06/2026
Rider weight ratios are a wildly contentious subject - it's horribly easy to be accused of fat-shaming any time the topic is discussed.
But really, it's a matter of horse welfare. If you weigh a certain amount, you need to calculate what size of horse is needed to carry that weight with no adverse effects.
Riders are free to be the size, weight and shape they want to be. The horse they ride has no such choice. Welfare matters.
Speaking as a saddle fitter as well as a coach, it's also important if you are acquiring said horse to consider if it has the space on its back to accommodate a saddle of the size you need. Some of the heavy breeds have a surprisingly short bearing area!
The 20% calculation is based on old cavalry guidelines that horses should carry no more than 20% of their fit body weight. Note that the rider weight actually includes saddle, bridle, boots, helmet and other accoutrements that the horse has to carry.
