P-Metric Tire Sizes – P-Metric To Inches Conversion Chart

January 3, 2026 HomeTechnical & InfoP-Metric Tire Sizes – P-Metric to Inches Conversion Chart

Offroaders.com Guide to P-Metric Tire Sizes, Conversion Chart and Tire Terminology – P-Metric to Inches

The following chart lists common p-metric tires sizes and the converted tread width and the actual tire height in inches. The values shown are calculated measurements based on the p-metric formula, which is explained below on this page. This chart is for an estimated conversion and the actual advertised tire height and tread width will vary from manufacturer to manufacturer. If you need to know the actual p-metric tire size and the equivalent measurements in inches for a specific tire, check with the manufacturer’s actual dimensions per individual tire brand before purchasing.

Rim Size	P-Metric Size	TreadWidth	Actual Tire Height
15 Inch	205/70R15	8.0 inches	26.3 inches
	215/75R15	8.46 inches	27.7 inches
	235/75R15	9.25 inches	28.9 inches
	265/70R15	10.4 inches	29.6 inches
16 Inch	225/75R16	8.8 inches	29.3 inches
	235/85R16	9.25 inches	31.7 inches
	245/75R16	9.6 inches	30.5 inches
	265/70R16	10.4 inches	30.6 inches
	265/75R16	10.4 inches	31.6 inches
	285/75R16	11.2 inches	32.8 inches
	305/70R16	12.0 inches	32.8 inches
	315/75R16	12.4 inches	34.6 inches
	345/75R16	13.6 inches	36.4 inches
17 Inch	235/65R17	9.25 inches	29.0 inches
	245/70R17	9.6 inches	30.5 inches
	255/75R17	10.0 inches	32.0 inches
	255/80R17	10.0 inches	33.0 inches
	265/70R17	10.4 inches	31.6 inches
	275/70R17	10.8 inches	32.2 inches
	285/70R17	11.2 inches	32.7 inches
	285/75R17	11.2 inches	33.8 inches
	305/65R17	12.0 inches	32.6 inches
	315/70R17	12.4 inches	34.4 inches
18 Inch	265/60R18	10.4 inches	30.5 inches
	275/65R18	10.8 inches	32.1 inches
	275/70R18	10.8 inches	33.2 inches
	285/75R18	11.2 inches	34.8 inches
	295/65R18	12.6 inches	33.1 inches
	305/60R18	12.0 inches	32.4 inches
	305/70R18	12.0 inches	34.8 inches
20 Inch	275/60R20	10.8 inches	33.0 inches
	275/65R20	10.8 inches	34.0 inches
	285/60R20	11.2 inches	33.4 inches
	285/65R20	11.2 inches	34.5 inches
	295/55R20	12.6 inches	32.8 inches
	295/60R20	11.6 inches	33.9 inches
	305/55R20	12.0 inches	33.2 inches
	325/60R20	12.8 inches	35.3 inches

Other 4×4 Related Calculators

▪ Convert P-Metric Tire to Inches ▪ Ring Pinion and Gear Ratio▪ Speedometer Converter ▪ Find new Gear Ratio with new Tire Size ▪ Find Overall Crawl Ratio ▪ Find MPH ▪ Find RPM▪ Convert P-Metric Tire to Inches

Reading a Tire:

All tires are required to have certain information molded into the side of the tire in a location known as the sidewall. Some of the information is self explanatory while other information requires a little knowledge to decipher. The following will help you understand what this information means.

Tire Type – This Defines the intended proper use of the tire. P indicates this is a passenger car tire while LT indicates the tire would be for a light truck with a heavier load rating.

Tire Width – This is the width of the tire measured in millimeters from sidewall to sidewall. An example might be 215 representing 215 millimeters.

Aspect Ratio – This is the ratio of the height of the tire’s cross-section to its width. An example of this might be 65, which means that the height is equal to 65% of the tire’s width. To calculate the aspect ratio, multiple the first number (e.g. 215) by the second number with a decimal before the number (e.g. .65). Using the example numbers the tires aspect ratio would calculate as 215x.65=139.75 where 139.75 is the tires height in millimeters. This is the height of the rubber from rim to tread on one side of the tire.

To convert the aspect ratio to a full tire height in inches, do this:Convert the above calculated tire height (aspect ratio) in millimeters to inches by multiplying the millimeters by .03937 (139.75 x .03937 = 5.5 inches). Then take the inches and multiply by two and add the rim size. Example: 5.5 x 2 + 15 (rim size in inches) = a 26 inch tall tire.

Construction – This indicates how the how the tire was put together and will say much about the tires handling characteristics. R indicates the tire is a radial type tire. For more information about what a radial is, click here. B indicates the tire is a bias ply type tire. For more information about bias ply type tires, click here.

Wheel Diameter – This is the width of the opening in the tire where it would be mounted to a wheel. This is measured from one bead across the opening to the other side of the same bead. This measurement is in inches and an example would be 15 and indicates that this tire is for a 15 inch rim, or wheel.

Load Index – This is a number corresponds to the maximum load in pounds that a tire can support when properly inflated. You will also find the maximum load in pounds and in kilograms molded elsewhere on the tire sidewall.

Speed Rating – This is a number that corresponds to the maximum service speed for a tire. See Chart for ratings. Note: Speed ratings are specific for passenger car tires and not light truck tires. Light truck tires (LT) are not speed rated.

Rating	Maximum Speed
Q	99 mph
S	112 mph
T	118 mph
U	124 mph
H	130 mph
V	149 mph
W	168 mph
Y	186 mph
Z	Above 149 mph

Previous

The Right Way to Dry a Smartphone

Next

Review of the Toyota FJ Cruiser

Related Articles

Dusty Trails Blog

End of an Era – TRAILS CLOSED

Offroaders Staff

I’ve heard that saying ‘all good things come to an end‘ thrown around like rocks getting chucked out of a mud tire.  But by ‘end‘ I just couldn’t have imagined it would be an end to the […]

Jeep JL Rubicon Projects

Installation: Mopar Tailgate Table for 18-19 Jeep Wrangler JL

Ralph Hassel

One of the cool things about a Jeep is that its a mobile platform for enjoying the great outdoors. On nearly every trail ride I’ve ever been on, there have been stops along the ride […]

Jeep JK Rubicon Projects

Great Jeeps aren’t bought, they’re built – Project Rubicon X

Ralph Hassel

Photo Caption: This is my 2014 Rubicon X as it rolls right now. Time for Change… There’s an old saying that goes: Great Jeeps aren’t bought, they’re built. Evidence of this can be found at any Jeep […]

Popular

12 Volt Wiring: Wire Gauge to Amps

Cheap Tricks and Useful Tips

Installed on Project Rubicon X: Maximus-3 Winch Mount, Bumper Hoop, Hook Anchors & D-Ring Loops

Jeep JK Rubicon Projects

Maximus-3 Winch Mount Installation – Bumper Removal

Jeep JK Rubicon Projects

Review: Maximus-3 Classic Hoop, Winch Mount, D-Ring Loops, Hook Anchor & Light Brackets – Rubicon X/10A/Hard Rock

Jeep JK Rubicon Projects

D-Ring Loops Installed on Project Rubicon X

Jeep JK Rubicon Projects

Cheap Tricks

The Right Way to Dry a Smartphone

5 great, inexpensive upgrades for your Jeep JK

Another Cool Use For Hard Drive Magnets

Hard Drive Magnets on Your Oil Filter

Best thing since Super Glue

Articles

Driving & Recovery Techniques

Common Offroad Driving Techniques

The following are some general offroad driving techniques that are used in all types of terrain. These general tips can help to improve your ability to navigate safely and efficiently.Safety & Hand PositionWhen driving off […]

Jeep CJ-7 Projects

Painting the Hangers

Project Jeep CJ-7 Scout II Dana 44 Axles Swap onto a CJ-7 FrameFabricated Leaf Spring HangersInstalling the Front Leaf Springs HangersBelow is the whole set of hangers. Gussets have been welded in and all the holes […]

Cheap Tricks and Useful Tips

12 Volt Wiring: Wire Gauge to Amps

12 Volt Wiring Gauge Requirements at specific Amps to length for Automotive Electrical Systems … Wire uses the measurement of gauge to determine the size of the wire. The larger the wire, the smaller […]

• Home
• Contact Us
• Technical Articles
• Mud & All Terrain Tire Reviews
• Offroad & Events
• Site Map

Copyright © 2026 | MH Magazine WordPress Theme by MH Themes