Load Range & Ply Rating Converter
Convert a tire's Load Range letter to its equivalent Ply Rating and find its typical max inflation pressure. Primarily for LT and ST tires.
This calculator helps you understand the strength and load-carrying capabilities of Light Truck (LT) and Special Trailer (ST) tires by converting their Load Range letter (e.g., B, C, D, E, F) into an equivalent "Ply Rating" and showing the typical maximum inflation pressure associated with that range.
Understanding Load Range & Ply Rating: - **Ply Rating:** Historically, this indicated the number of cotton layers (plies) in a tire's construction, signifying its strength. Modern tires use stronger materials, so "ply rating" is now an equivalency term. A tire with a 10-ply rating might not have 10 actual plies but has the strength of one. - **Load Range:** This letter-based system (B, C, D, E, F, etc.) has largely replaced explicit ply ratings. Each letter corresponds to a specific ply rating equivalent and a maximum inflation pressure needed to achieve the tire's full load capacity.
Why It Matters: - **Safety:** Using tires with an insufficient load range for your vehicle and its cargo can lead to tire failure. - **Load Capacity:** Ensures your tires can safely support the weight of your truck or trailer when fully loaded. - **Durability:** Tires with higher load ranges are generally built tougher to withstand heavier use.
Always choose tires that meet or exceed your vehicle manufacturer's recommended load range specifications.
- Locate the Load Range letter on your tire's sidewall. It's usually found on LT (Light Truck) or ST (Special Trailer) tires (e.g., LT245/75R16 Load Range E).
- Select this Load Range Letter from the dropdown menu in the calculator.
- Click the "Get Details" button.
- The results will display the equivalent ply rating and the typical maximum inflation pressure (in PSI) associated with that load range.
All tools and information provided on TireCalculatorHub are for informational purposes only. Always select tires that meet or exceed your vehicle manufacturer's specifications and intended load. Consult with a qualified tire professional for specific applications.
TireCalculatorHub is not liable for any damages or issues arising from the use of information or tools on this website.