Tire Load Index Calculator
Key Takeaways
- Never downgrade load index. Match or exceed the load index shown on your vehicle placard and original tires.
- Calculate with real-world weight. Use curb weight plus passengers and cargo; add a sensible reserve for safety.
- Front/rear isn’t always 50/50. If you know axle split, size to the higher per-tire load.
- Inflation matters. Load capacity assumes correct pressure; check your placard and monitor TPMS.
Next Steps
Fitment Notes
- LT / Commercial tires: Load index and inflation tables differ from P-metric; follow manufacturer data.
- Towing & payload: Frequent heavy loads may require a higher reserve capacity and different tire class.
- Mixed sets: Avoid mixing different load indexes or constructions on the same axle.
Reviewed by the Performance Plus Tire Fitment Team
This tool is for guidance only and assumes properly maintained tires inflated to the vehicle placard pressure. Always follow the vehicle manufacturer specifications and consult our team for edge cases (lifted vehicles, aftermarket load changes, towing, or commercial use).
