Inches from any size
Overall diameter, section width, sidewall height, circumference, and revolutions per mile for the size you enter.
Tire size converter
Convert a Tacoma or midsize pickup tire size to inches.
Enter a metric or flotation size to see it in inches, plus the equivalent size in the other format.
Summary: This converter turns any Tacoma or other truck tire size into inches: overall diameter, section width, sidewall height, circumference, and revolutions per mile.
Updated
What are common Tacoma tire sizes in inches?
This chart converts every Tacoma tire size with its own Taco Tires size page, factory sizes and popular upgrades, into inches, using the same math as the converter below. For example, 285/70R17 calculates to 32.71 in tall, so it is commonly called a 33. Figures are calculated from the size code; real tires vary slightly by brand and tread depth, so check the manufacturer's spec sheet before you buy.
In a metric size like 265/70R17 the first number is section width in millimeters; in a flotation size like 33x12.50R17 the first number is overall diameter in inches.
| Tire size | Overall diameter | Section width | Sidewall | Revs per mile | Other-format equivalent | Roughly called |
|---|---|---|---|---|---|---|
| 245/75R16 | 30.47 in | 9.65 in | 7.23 in | 662 | 30.5x9.6R16 | a 31 |
| 265/70R16 | 30.61 in | 10.43 in | 7.30 in | 659 | 30.6x10.4R16 | a 31 |
| 265/75R16 | 31.65 in | 10.43 in | 7.82 in | 637 | 31.6x10.4R16 | a 32 |
| 285/75R16 | 32.83 in | 11.22 in | 8.42 in | 614 | 32.8x11.2R16 | a 33 |
| 245/70R17 | 30.50 in | 9.65 in | 6.75 in | 661 | 30.5x9.6R17 | a 31 |
| 265/65R17 | 30.56 in | 10.43 in | 6.78 in | 660 | 30.6x10.4R17 | a 31 |
| 265/70R17 | 31.61 in | 10.43 in | 7.30 in | 638 | 31.6x10.4R17 | a 32 |
| 275/70R17 | 32.16 in | 10.83 in | 7.58 in | 627 | 32.2x10.8R17 | a 32 |
| 285/70R17 | 32.71 in | 11.22 in | 7.85 in | 617 | 32.7x11.2R17 | a 33 |
| 33x10.5R17 | 33.00 in | 10.50 in | 8.00 in | 611 | 265/77R17 | a 33 |
| 33x12.5R17 | 33.00 in | 12.50 in | 8.00 in | 611 | 320/64R17 | a 33 |
| 255/80R17 | 33.06 in | 10.04 in | 8.03 in | 610 | 33.1x10.0R17 | a 33 |
| 295/70R17 | 33.26 in | 11.61 in | 8.13 in | 606 | 33.3x11.6R17 | a 33 |
| 285/75R17 | 33.83 in | 11.22 in | 8.42 in | 596 | 33.8x11.2R17 | a 34 |
| 35x12.5R17 | 35.00 in | 12.50 in | 9.00 in | 576 | 320/71R17 | a 35 |
| 265/60R18 | 30.52 in | 10.43 in | 6.26 in | 661 | 30.5x10.4R18 | a 31 |
| 265/65R18 | 31.56 in | 10.43 in | 6.78 in | 639 | 31.6x10.4R18 | a 32 |
| 285/65R18 | 32.59 in | 11.22 in | 7.29 in | 619 | 32.6x11.2R18 | a 33 |
| 265/70R18 | 32.61 in | 10.43 in | 7.30 in | 619 | 32.6x10.4R18 | a 33 |
| 275/70R18 | 33.16 in | 10.83 in | 7.58 in | 608 | 33.2x10.8R18 | a 33 |
| 285/70R18 | 33.71 in | 11.22 in | 7.85 in | 598 | 33.7x11.2R18 | a 34 |
How do I read this table?
- Other-format equivalent is the same calculated tire written the other way (metric to flotation, or flotation to the nearest 5 mm metric width). Few tires are sold at exactly that size, so compare a real size's diameter and width instead of its label.
- Roughly called is the calculated diameter rounded to the nearest inch. Sizes close to a half inch can be marketed under either number, and fitment on your truck depends on generation, lift, and wheel offset, not the nickname.
- Revs per mile is calculated from the unloaded diameter; a loaded tire turns slightly more.
Convert any other size with the Tire Size to Inches Converter below. Related: All Tacoma tire sizes · Tire size calculator.
How does this tire size to inches converter work?
The converter reads a tire size code and turns it into the measurements a Tacoma or any other midsize pickup owner actually shops by: how tall the tire stands, how wide the tread section is, how tall the sidewall is, and how many times it turns in a mile. It works only from the numbers printed on the sidewall, so it gives the same answer a tire shop would get with a pencil, and you can check every step.
What do I enter?
- One tire size, metric (265/70R17, with or without a P or LT prefix) or flotation (33x12.50R17).
- A size in the page address, such as ?size=285/70R17, loads straight into the field, so a converted size can be shared as a link.
What does it show?
- Overall diameter, section width, and sidewall height in inches.
- Wheel diameter, circumference, and revolutions per mile.
- The same tire written in the other format: metric to flotation, or flotation to the nearest 5 mm metric width.
How big is 265/70R17 vs 285/70R17 in inches?
2026 TRD Off-Road trucks leave the factory on 265/70R17 in Taco Tires' fitment data, and 285/70R17 is the usual next size up. Here is the conversion for each, step by step.
265/70R17: 265 mm ÷ 25.4 = 10.43 in wide; the sidewall is 70% of that width, 185.5 mm or 7.30 in; overall diameter = 17 + 2 × 7.30 = 31.61 in.
285/70R17: 285 mm ÷ 25.4 = 11.22 in wide; the sidewall is 70% of that width, 199.5 mm or 7.85 in; overall diameter = 17 + 2 × 7.85 = 32.71 in.
So the 285/70R17 stands 1.10 in taller and 0.79 in wider than the 265/70R17, and it turns 22 fewer times per mile.
| Measurement | 265/70R17 | 285/70R17 |
|---|---|---|
| Section width | 10.43 in | 11.22 in |
| Sidewall height | 185.5 mm / 7.30 in | 199.5 mm / 7.85 in |
| Overall diameter | 31.61 in | 32.71 in |
| Revolutions per mile | 638 | 617 |
| Flotation equivalent | 31.6x10.4R17 | 32.7x11.2R17 |
| Roughly called | a 32 | a 33 |
How is it different from a generic calculator?
- Sizes tied to real trucks: each size in the chart above links to its Tacoma size page, which lists the factory trims that run it and what each generation needs to clear it, instead of leaving you with a bare number.
- Every step is shown: width = section mm ÷ 25.4; sidewall = width × aspect ÷ 100; diameter = wheel + 2 × sidewall; revolutions per mile = 63,360 ÷ (π × diameter).
- Equivalents you could actually find: a flotation size converts to a metric code snapped to the 5 mm widths tires are sold in, rather than an unbuyable decimal width.
How many inches tall is a 285/70R17 truck tire?
A 285/70R17 calculates to 32.71 in tall and 11.22 in wide, which is why it is sold as a 33 on Tacomas and other midsize pickups. The height is the same on any truck; what changes is what it takes to fit. With stock-style wheel offset, Taco Tires lists it as 3 in suspension lift, plus minor changes on the 2nd gen Tacoma (2005-2015); 3 in suspension lift, plus minor changes on the 3rd gen Tacoma (2016-2023); stock height, plus minor changes on the 4th gen Tacoma (2024-2026). Confirm clearance at full steering lock and full suspension compression before you buy.
Related: 265/70R17 on a Tacoma · 285/70R17 on a Tacoma.
What it does
What does this tool do?
Metric and flotation
Shows the equivalent in the other format, so 285/70R17 and 33x12.50R17 can be compared directly.
Format explainer
Clarifies that a flotation size leads with diameter while a metric size leads with section width in millimeters.
Which related tools and guides should I use next?
Where do these numbers come from?
A size code converts to inches by formula: wheel diameter plus two sidewalls, where each sidewall is section width times aspect ratio. Treat the result as nominal, because a specific tire model's measured diameter is on its manufacturer page and can differ slightly.
- Tire geometry: computed from the numbers in each size code with this site's published formulas (no outside data)
- Toyota 2026 Tacoma Owner's Manual tire and wheel specs: factory tire sizes and wheel widths
- BFGoodrich All-Terrain T/A KO3 product page (measured tire specs)
- Falken Wildpeak A/T4W product page (measured tire specs)
- Toyo Open Country A/T III product page (measured tire specs)
- Nitto Ridge Grappler product page (measured tire specs)
Tire Size to Inches Converter FAQ.
265/70R17 is about 31.6 inches in overall diameter with a 10.4 inch section width on a 17 inch wheel. Enter it above to see sidewall height, circumference, and revolutions per mile.
Close. 285/70R17 calculates to about 32.7 inches, and real-world diameter varies by brand and tread from roughly 32.7 to 33.1 inches, so it is marketed as a 33.
In flotation sizing the first number is overall diameter in inches. In metric sizing the first number is section width in millimeters. They only line up because a 285/70R17 happens to be about 32.7 inches tall.
There is no single one, because a metric size leads with section width, not height. The metric 33s most often fitted to a Tacoma or other midsize pickup are 285/70R17 at 32.71 in and, on 18 inch wheels, 275/70R18 at 33.16 in, both from the sidewall math. The flotation 33x12.5R17 is 33.00 in nominal, and real tires of any size run a little shorter or taller by brand and tread.