Seat size tells you how much room you have as a rider. Gullet and tree width tell you how the saddle sits on your horse's back. A saddle sized right for you can still pinch a horse with narrow shoulders, and a saddle built wide enough for a broad backed horse can leave a tall rider cramped in the seat. Below we walk through each measurement step by step, plus the spots where a tape measure alone will not tell you everything you need to know.

How to Measure a Western Saddle Seat Size

Western saddle seats have traditionally been measured by the seat size of the bare tree that the saddle is built on. As a standard you measure by going from the base of the horn, at the swell, to the stitching “cantle binding” on the cantle. Lay a flexible tape measure along that line and read the number in inches. That figure is your seat size, and it is the starting point for rider comfort and balance. At Saddle Up - We also measure the finished seat size, start at the same starting point, but end at the edge of the finished padding or start of the cantle point. 

Most adult riders fit a 14" to 17" seat, with 15" to 16" being the most common range. Riders who wear a larger pant size or ride with heavier winter layers often size up half an inch, while smaller framed riders tend to do better sizing down. Youth saddles run smaller still, typically 10" to 13", to match a young rider's build.

A good rule of thumb once you are sitting in the saddle is that you have a finger or two of space between your thigh and the swell. Too small and you don’t sit properly in the pocket of the saddle - you will feel like you're tipping forward. Too big of a seat and you sit in more of a lawn chair position with your feet going out in front you. It is always ideal to sit in a lot of saddles as the seat size is just one measurement. There are many other factors such as the thigh width from the swell to start of the cantle, does the saddle have a lower cantle with a flatter seat or higher cantle with a deeper seat. How much padding is in the seat or is it a hard seat saddle? If you are shopping online, you can browse new saddles by seat size or used saddles by seat size if you are not sure, our team can help you determine the best fit for you. We take pride in knowing how the different factors can change your sizing needs.

How to Measure a Western Saddle Gullet and understanding Tree Width

The tree is the foundation a saddle is built on, and when it comes to saddle fit the entirety of the tree will determine how the saddle fits not just the gullet width. The gullet is the open channel in the tree that sits over your horse's withers. Where seat size is about the rider, gullet and tree style are entirely about the horse.

While gullet is one small factor in how a saddle will fit your horse, it is unfortunately far too often how the Western saddle industry defines saddle fit. The true gullet measurement is taken before any leather or fleece is put on the underside of the saddle and it’s only 1 small factor in finding the proper saddle fit for your horse. Some of the bigger factors come from knowing the angle of the bars, how much rock is in the saddle tree, how much the back gullet hole or hand hold is widened out. Matching the 3 dimensional underside of the saddle to the 3 dimensional top side of the horse is where saddle fit begins. Too many folks get stuck on gullet width, and in our years of experience it is one of the smaller aspects that come into play. As an industry standard on a used or finished saddle, measuring  the gullet requires taking your tape inside the front area of the saddle and running the tape measure from the center of one concho to the other side center of that concho, it is referred to as going mid concho to mid concho. That number typically falls somewhere between 6" and 7.5"- 8”, and it corresponds to a bar type.

• Semi quarter horse bars usually run about 6" to 6.25" and are a more outdated saddle fit but some say they would suit a narrower, higher withered horse.
• Quarter horse bars usually run about 6.5" 
• Full Quarter bars are 6.75” to 7" and fit the broader build common in most stock type horses today.
• Wide or extra wide bars run 7.5" and up, built for mutton withered or heavily muscled horses.

Why Gullet Size Alone Does Not Determine Fit

Many saddle makers have gotten away from using the gullet width to determine tree size, it is becoming more common to see the tree size labeled as narrow, regular, wide, extra wide or draft bars, which can refer more to the angles of the bars as to how it fits a horse's back vs classifying the saddle from one gullet measurement. A saddle with the right gullet number but the wrong angle or rock can still ride poorly.

Two saddles can share the same gullet measurement but have completely different angles or bar spread, one can have a lot of rock to the bar for a more sway back horse while one may have a wider flatter bar pattern for more flat back horses in turn they will fit a horse completely differently. Saddle fitting day in & day out for the last 30 years has taught us that bar angle and rock matter just as much as width. Bar angle is how steeply the bars flare out from the gullet, and it needs to roughly match the slope of your horse's shoulders and back. Rock is the curve built into the bottom of the bars, front to back, and it needs to follow the curve of your horse's back. A gullet that measures right but sits on bars with the wrong angle or rock can still cause pressure points  at the shoulder or bridge in the middle. This is exactly why we check saddle fit with our hands, feeling for smooth, even contact along the entire tree bar, not just checking a number on a spec sheet. You can walk through our full process in our saddle fitting guide, and once fit is confirmed, a properly fitting saddle pad simply adds cushion rather than correcting a mismatch.

Rider Fit and Horse Fit, Two Measurements That Matter

It is easy to think of saddle fit as one single number, but you are really solving for two separate measurements at the same time. Seat size fits the rider. Gullet, tree width, bar angle, and rock fit the horse. A saddle can nail one and miss the other completely.

Horse conformation plays a bigger role here than most riders expect. A horse with high, pronounced withers needs a narrower gullet and steeper bar angle than a mutton withered horse whose shoulders barely rise above the back line. Short backed horses need shorter skirts so the saddle does not interfere with hip movement. A horse that has changed shape from age, weight, or a change in workload may need a different tree than it did a year ago, even if the rider's own seat size has not changed at all.

That is a lot of variables to track with a tape measure alone. Our team walks through both sides of the equation with you, whether you are picking out a saddle in the shop or scheduling a saddle fitting so we can check the fit on your horse directly.

Why Western Saddle Measurements Differ Between Brands

Something that catches a lot of riders off guard is the fact that a FQHB from one maker or even the disciplines from that maker can fit a horse completely differently meaning their FQHB Roping saddle will fit a horse differently than that maker's FQHB barrel saddle. To add more confusion a 15" seat on one saddle may feel completely different than a 15” seat on another saddle. Every builder has its own tree patterns, its own way of shaping the swell and cantle for the discipline of saddle. The traditional feel of a Billy Cook, the innovation you find in a Circle Y, and the cowboy comfort built into a McCall can all carry the same size label and all fit the horse differently as well as sit the rider differently once you are in the seat.

That is why we always recommend confirming specs against the individual maker's own sizing rather than assuming measurements carry over from brand to brand. Our saddles by brand collection groups inventory by maker so you can compare styles side by side, and if none of our in stock options are quite right, we also work with custom saddle orders built to your exact specifications.

Why Measuring a Western Saddle Is Only One Part of Finding the Right Fit

Flat backed horses, draft breeds, and mustangs are a good example of where a standard measurement chart falls short. A draft cross with a broad, flat back needs a much wider gullet, flatter bar and wider bar angle than the chart assumes for an average stock horse, and a mustang's compact build may call for a shorter skirt. In cases like these, the numbers are a starting point, not a final answer.

This is where a professional saddle fitting earns its keep. Our fitters check the same measurements covered above, then go further, feeling the tree against your horse's actual back, checking wither clearance by hand, and testing stability under simulated weight. It is the difference between a saddle that looks right on a spec sheet and one that rides right for years.

FAQs

1. How do you measure a western saddle seat?

Run a tape from the base of the horn, where it meets the swell, straight back to the stitching on the  cantle. Keep the tape taut and read the number to the nearest half inch.

2. What size western saddle do I need?

Most adult riders fit a 14" to 17" seat, with 15" to 16" being the most common range. The best way to confirm your size is to sit in a saddle and check for a finger or two of space between your thigh and the swell. If you are between sizes or shopping online, our team can help you narrow it down over the phone.

3. How do you measure a western saddle gullet?

Get the type inside the gullet area and measure inside, straight across from center of concho to center of concho. Remember this is only1 small piece of the puzzle. We offer a back tracing program, where you can send us a full set of back tracings of your horse, we in turn put those in the underside of saddles to try and help match the angles of the saddle to your specific horse's back. 

4. How do you know if a western saddle fits your horse?

Check for smooth, even contact along the full length of the tree bars with no pinching, gapping, or catches, and look for a couple of fingers of clearance at the withers rather than a full fist. For the complete step by step process, see our saddle fitting guide.

Get the Right Fit the First Time

A tape measure will get you close. It will narrow your search, rule out saddles that were never going to work, and help you talk specs with confidence whether you are standing in our shop or reading a listing from your kitchen table. But the last mile of fit, the part where a saddle and a horse actually agree with each other, still comes down to hands and eyes on the saddle when it’s on the horse's back.

That is what our team is here for. We carry over 400 new and used western saddles across every discipline and seat size, and every one of them is backed by real fitting expertise, not just a spec sheet. Browse our full new saddle collection, check our current used saddle inventory, or give us a call and let our team help you measure, compare, and find a saddle that fits both you and your horse.