Load-at-Pressure Table Tool
Look up tire load capacity at a given inflation pressure. Approximate SL and XL load tables in psi, bar, kg and lb.
Look up applicable load capacities.
Load-at-Pressure Table Tool: Tire Size Inputs
Compare two tire sizes here. Use the formulas and reference tables below for this tool's specific calculation.
How Load-at-Pressure Table Tool Works?
The Load at Pressure Table Tool works by scaling the tire's maximum load by the ratio of the chosen pressure to the reference pressure, raised to the 0.7 power. The tool uses 4 steps.
Enter the load index
Type the index, for example 94 (670 kg, 1,477 lb).
Choose construction
Pick SL (reference 2.5 bar, 36 psi) or XL (reference 2.9 bar, 42 psi).
Enter pressure
Type the pressure, for example 32 psi (2.2 bar).
Read capacity
The tool returns about 617 kg (1,360 lb) at 32 psi for a 94 SL tire.
Load-at-Pressure Table Tool Formula
The Load at Pressure Table Tool approximation is L(p) = L_max × (p ÷ p_ref)^0.7, capped at L_max.
L(p) = L_max × (p ÷ p_ref)^0.7L(p) ≤ L_maxbar = psi × 0.0689476- L_max
- Capacity from the load index (kg)
- p
- Cold inflation pressure
- p_ref
- Reference pressure, 36 psi SL or 42 psi XL
Worked example
A 94 SL tire (670 kg) at 29 psi (2.0 bar) carries 670 × (29 ÷ 36)^0.7 = 576 kg (1,270 lb). At 36 psi the tire carries the full 670 kg (1,477 lb).
Load-at-Pressure Table Tool Conversion Table
The Load at Pressure Table Tool conversion table lists approximate capacity at 8 pressures for a 94 SL and a 98 XL tire.
| Pressure | 94 SL | 98 XL |
|---|---|---|
| 26 psi (1.8 bar) | 534 kg (1,176 lb) | 536 kg (1,182 lb) |
| 29 psi (2.0 bar) | 576 kg (1,270 lb) | 579 kg (1,276 lb) |
| 32 psi (2.2 bar) | 617 kg (1,360 lb) | 620 kg (1,367 lb) |
| 35 psi (2.4 bar) | 657 kg (1,448 lb) | 660 kg (1,455 lb) |
| 36 psi (2.5 bar) | 670 kg (1,477 lb) | 673 kg (1,484 lb) |
| 38 psi (2.6 bar) | 670 kg (1,477 lb) | 699 kg (1,542 lb) |
| 41 psi (2.8 bar) | 670 kg (1,477 lb) | 737 kg (1,626 lb) |
| 42 psi (2.9 bar) | 670 kg (1,477 lb) | 750 kg (1,653 lb) |
Values use the 0.7-power approximation. Official ETRTO and TRA load-inflation tables govern.
What is Load-at-Pressure Table Tool?
A Load at Pressure Table Tool is a tool that estimates how much weight a tire carries at an inflation pressure below its reference pressure. Air carries the load, so lower pressure means lower capacity.
The load index states capacity only at the reference pressure. Most placards specify pressures below the reference value, so the real capacity in service is lower than the index value.
Official load-inflation tables from ETRTO and TRA give exact values in pressure steps of 0.1 bar or 1 psi.
What are the uses of Load-at-Pressure Table Tool?
There are 4 main uses of the Load at Pressure Table Tool, including towing pressure and low-pressure checks.
Towing pressure
Find the pressure that carries extra rear axle load.
Low-pressure checks
See the capacity lost by running low pressure.
Replacement equivalence
Find the pressure a new tire needs to match the old capacity.
Off-road airing down
Estimate capacity when airing down for sand.
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