Round Pen Size Calculator
Want to build a round pen? Getting the size wrong is one of the easiest…
Derby Fence - The Ultimate Fencing Solution for Any Climate
Derby Fence offers premium HDPE fencing systems designed to build custom round pens for horses, cattle, and livestock—delivering unmatched safety, durability, and flexibility for any operation.
A round pen is one of the most versatile and essential tools in any equestrian or livestock operation. Whether you’re planning a round pen for horses or creating a multi-use space for livestock, Derby Fence provides the materials to build a solution that fits your exact needs.
Unlike pre-fabricated kits, Derby’s approach gives you full control. Using our high-performance HDPE rail fencing, you can create custom round pens in any diameter, layout, or configuration—perfect for training, handling, or managing animals safely and efficiently.

A well-designed round pen is essential for effective horse training. Derby Fence makes it easy to build round pens that support consistent, controlled movement and communication between horse and handler.
With a properly sized equestrian round pen, trainers can:
Because Derby’s HDPE fencing is strong yet forgiving, it absorbs impact without splintering or breaking—making it ideal for high-use training applications.
For agricultural operations, round cattle working pens and livestock enclosures play a critical role in daily management. Derby Fence provides a reliable solution for building round pens that improve efficiency and safety.
Use custom-built round pens for:
Our HDPE fencing resists weather, moisture, and wear from heavy use, making it a dependable choice for demanding farm environments.
Every operation is different—which is why Derby Fence systems are designed for complete customization. Instead of fixed kits, you can build a round pen for horses or livestock that matches your exact requirements, with flexible options for diameter, layout, and rail configurations including 2, 3, 4, or 5 rails. Our fencing systems also integrate seamlessly with paddocks, arenas, or existing fencing, making it easy to create a cohesive and functional setup across your property.
Built from durable HDPE and backed by a 20-year warranty, Derby Fence round pens are designed to perform season after season with minimal maintenance. If you’re comparing round pens for sale, choosing HDPE means investing in a long-term solution that won’t crack, splinter, or degrade over time—giving you a safe, reliable enclosure for both equine and livestock applications.
Colors Shown: Black, Grey, Hunter Green, Weathered Wood, Brown, Redwood, Cedar, White


With years of expertise, we deliver fencing solutions trusted by professionals across the U.S.

Crafted with premium materials and superior craftsmanship, ensuring top-tier quality.

Weather-resistant, impact-tested, and designed to keep your animals safe for years to come.
“We are very pleased with your product. We did 2500 linear feet in 5 days. If you ever need any references please do not hesitate to call.”
“We are very pleased with your product. We did 2500 linear feet in 5 days. If you ever need any references please do not hesitate to call.”
“Looks great and amazing,Derby Fence is one of the toughest, safest, most environmentally friendly horse fences in the world today.”
“It is a great product and very safe for the horses love it.”
Want to build a round pen? Getting the size wrong is one of the easiest…
A round pen is one of the most practical investments you can make if you…
When it comes to creating a safe and functional space for horses, one of the…
Call us today at 1.847.680.1550 or use the email contact form below to request information or get a quote from Derby Fence. All fields must be filled in to submit form. Please include your address if you would like more information mailed to you. We look forward to working with you!