Light Truck Tire Size Calculator
Read LT and float sizes for trucks. Use the calculator below. Results update as you type.
How the Light Truck Tire Size Calculator Works
This calculator works by decoding LT-metric sizes (LT265/70R17) and flotation sizes (33x12.50R17LT) into diameter, width and revs per mile. It handles both notation styles.
- Enter the size, for example LT295/70R18.
- Read the diameter: 34.26 in (870 mm).
- Read the width: 11.61 in.
- Read the revs per mile: 589.
The Formula
The formula uses the metric diameter formula for LT-metric sizes and reads the diameter directly from flotation sizes.
LT-metric: D = (Rim × 25.4) + 2 × (Width × Aspect Ratio ÷ 100) Flotation: D = First Number (in) Revs per Mile = 20,168 ÷ D (in)Worked example: 35x12.50R18LT has D = 35.00 in, so revs per mile = 20,168 ÷ 35 = 576.
Conversion Table
The conversion table lists 12 light truck sizes, 8 LT-metric and 4 flotation. Diameters run from 30.39 in (LT215/85R16) to 37.00 in (37x12.50R17LT).
LT315/75R16 at 34.60 in sits between a 34 in and 35 in flotation tire.
| Size | Diameter (in) | Width (in) | Revs / Mile |
|---|---|---|---|
| LT215/85R16 | 30.39 | 8.46 | 664 |
| LT235/80R17 | 31.80 | 9.25 | 634 |
| LT245/75R16 | 30.47 | 9.65 | 662 |
| LT265/70R17 | 31.61 | 10.43 | 638 |
| LT275/70R18 | 33.16 | 10.83 | 608 |
| LT285/75R16 | 32.83 | 11.22 | 614 |
| LT295/70R18 | 34.26 | 11.61 | 589 |
| LT315/75R16 | 34.60 | 12.40 | 583 |
| 33x12.50R17LT | 33.00 | 12.50 | 611 |
| 35x12.50R18LT | 35.00 | 12.50 | 576 |
| 37x12.50R17LT | 37.00 | 12.50 | 545 |
| 31x10.50R15LT | 31.00 | 10.50 | 651 |
What Is the Light Truck Tire Size Calculator?
The Light Truck Tire Size Calculator is a tool that processes light truck tire sizes in LT-metric and flotation notation. LT tires are built for pickups, vans and SUVs that tow or haul.
LT tires use load ranges (C, D, E, F) instead of SL and XL. Their casings are stiffer, which supports more weight and resists punctures off-road.
Common Uses
This calculator has 4 uses: pickup replacements, off-road upgrades, van fitments and towing setups.
- Replace pickup tires: Decode LT placard sizes.
- Upgrade for off-road: Compare LT-metric and flotation sizes.
- Fit vans: Decode commercial van sizes.
- Set up for towing: Pair sizes with load ranges.