Load Range to Ply Rating Converter
E is a 10-ply rating class, not ten belts. It is not a number of pounds by itself.
What it does
Maps load-range letters B–N to ply rating using USTMA Table 1 for commercial truck and bus tires. SL and XL are inflation marks, not ply ratings.
How to use it
Type C, D, E, F, SL or XL as printed on the sidewall.
How to read the result
Ply rating is a capacity class from when tires were cotton. A modern 10-ply-rated radial may have two steel belts. Pounds of load come from the size plus the load index (and, for LT/ST, the inflation table we do not republish). Never read “Load Range E” as “more capacity at the old PSI.”
What this does not calculate
Letters do not convert to pounds without a size. C1 vs C2 passenger marks use different reference PSI at the same construction story — we do not flatten that into one number.
Does not output a load in pounds or a recommended PSI. Use Load index and Load capacity check.
Questions
- Is XL the same as Load Range C?
- No. XL is a passenger extra-load inflation mark. C is a light-truck load range. Do not mix them as if they were the same class.
- Where are the pounds?
- Load index on the same page family. Capacity check if you are comparing a replacement against a GAWR.
Related tools
- Tire Load Index Chart & Speed RatingsThe number before the letter (91H) is load. The letter is speed. Both have to meet the door-jamb spec.
- Tire Load Capacity vs Axle WeightWill these tires hold that axle? We add the pounds from the load-index table. We do not invent an air pressure.
- PSI to kPa to Bar ConverterThe sidewall number is a maximum. The door sticker is what the car wants. Convert units here — do not mix them up.
Estimate — not a fitment approval.
