Tire Load Index Calculator
Decode your tire load index number to find the maximum weight each tire can carry.
Verify your tires are rated for your vehicle and cargo weight.
Tire load index is a number on the tire’s sidewall that corresponds to the maximum weight each tire can support when properly inflated. It is part of the tire size code, for example: 225/65R17 102H — the “102” is the load index, “H” is the speed rating.
Why it matters:
If your vehicle is loaded beyond the tire’s capacity, the tire can overheat, deform, or fail — causing a blowout. This is especially important when hauling cargo, towing, or adding passengers and luggage.
Load index table (key values):
| Index | kg | lbs | Index | kg | lbs |
|---|---|---|---|---|---|
| 70 | 335 | 739 | 90 | 600 | 1,323 |
| 75 | 387 | 853 | 95 | 690 | 1,521 |
| 80 | 450 | 992 | 100 | 800 | 1,764 |
| 82 | 475 | 1,047 | 102 | 850 | 1,874 |
| 84 | 500 | 1,102 | 104 | 900 | 1,984 |
| 86 | 530 | 1,169 | 106 | 950 | 2,094 |
| 87 | 545 | 1,202 | 108 | 1,000 | 2,205 |
| 88 | 560 | 1,235 | 110 | 1,060 | 2,337 |
| 89 | 580 | 1,279 | 112 | 1,120 | 2,469 |
Full Load Rating formula:
Total capacity (4 tires) = Single tire capacity × 4
Your vehicle’s GVWR (Gross Vehicle Weight Rating) should never exceed the combined tire capacity. Check the sticker inside your driver’s door jamb for your vehicle’s GVWR.
Speed rating letters (on the same sidewall):
| Letter | Max Speed |
|---|---|
| Q | 160 km/h (99 mph) |
| R | 170 km/h (106 mph) |
| S | 180 km/h (112 mph) |
| T | 190 km/h (118 mph) |
| H | 210 km/h (130 mph) |
| V | 240 km/h (149 mph) |
| W | 270 km/h (168 mph) |
| Y | 300 km/h (186 mph) |
Never exceed your tire’s speed rating — it also affects handling and heat buildup.
Reading a full tire code:
225 / 65 R 17 102 H
- 225 = tread width in mm
- 65 = aspect ratio (sidewall height = 65% of 225mm)
- R = radial construction
- 17 = rim diameter in inches
- 102 = load index
- H = speed rating