P315/40R18 in Inches

Tire size P315/40R18 refers to the tire size in numbers and letters such as the first number “315” indicates the tire width in millimeters, the second number “40” indicates the aspect ratio of the tire and the last number indicates the diameter of the tire. A P315/40R18 tire in inches can be described as a tire with a width of about 12.4 inches, a sidewall height of about 5 inches, and it fits on a 18-inch wheel.

Converting P315/40R18 in Inches

P315/40R18 inches mm
Tire Diameter 27.9 inches 709 mm
Tread Width 12.4 inches 315 mm
Rim Diameter 18 inches 457 mm
Sidewall Height 5 inches 126 mm
Circumference 87.6 inches 2226 mm
Revolutions 723 per mile 449 per km

Tire Size Calculator

The Tire Size Calculator is a convenient online tool that helps determine the correct tire dimensions for a vehicle, ensuring optimal performance and compatibility.

Tire Diameter
Tread Width
Rim Diameter
Sidewall Height
Circumference
Revolutions

P315/40R18 Alternate Tire Size

Tire Size Overall Diameter Difference
225/40R20 27.1″ (688 mm) -3%
145/80R18 27.1″ (689 mm) -2.8%
165/70R18 27.1″ (689 mm) -2.8%
295/35R19 27.1″ (689 mm) -2.8%
345/30R19 27.2″ (691 mm) -2.5%
305/30R20 27.2″ (692 mm) -2.4%
215/55R18 27.3″ (693 mm) -2.3%
235/50R18 27.3″ (693 mm) -2.3%
295/40R18 27.3″ (693 mm) -2.3%
175/60R19 27.3″ (693 mm) -2.3%
155/60R20 27.3″ (694 mm) -2.1%
265/35R20 27.3″ (694 mm) -2.1%
235/45R19 27.4″ (695 mm) -2%
265/40R19 27.4″ (695 mm) -2%
265/45R18 27.4″ (695 mm) -2%
145/65R20 27.4″ (696 mm) -1.8%
235/40R20 27.4″ (696 mm) -1.8%
355/30R19 27.4″ (697 mm) -1.7%
305/35R19 27.4″ (697 mm) -1.7%
315/30R20 27.5″ (698 mm) -1.6%
345/35R18 27.5″ (699 mm) -1.4%
175/55R20 27.6″ (700 mm) -1.3%
275/35R20 27.6″ (700 mm) -1.3%
305/40R18 27.6″ (701 mm) -1.1%
155/70R19 27.6″ (701 mm) -1.1%
215/45R20 27.6″ (702 mm) -1%
275/40R19 27.7″ (703 mm) -0.8%
145/85R18 27.7″ (703 mm) -0.8%
205/60R18 27.7″ (703 mm) -0.8%
245/50R18 27.7″ (703 mm) -0.8%
245/45R19 27.7″ (703 mm) -0.8%
315/35R19 27.7″ (703 mm) -0.8%
325/30R20 27.7″ (704 mm) -0.7%
195/50R20 27.7″ (704 mm) -0.7%
245/40R20 27.7″ (704 mm) -0.7%
225/55R18 27.8″ (705 mm) -0.6%
155/80R18 27.8″ (705 mm) -0.6%
275/45R18 27.8″ (705 mm) -0.6%
165/60R20 27.8″ (706 mm) -0.4%
285/35R20 27.9″ (708 mm) -0.1%
225/45R20 28″ (710 mm) 0.1%
155/65R20 28″ (710 mm) 0.1%
335/30R20 28″ (710 mm) 0.1%
285/40R19 28″ (711 mm) 0.3%
255/40R20 28″ (712 mm) 0.4%
255/45R19 28.1″ (713 mm) 0.6%
285/45R18 28.1″ (713 mm) 0.6%
255/50R18 28.1″ (713 mm) 0.6%
295/35R20 28.1″ (714 mm) 0.7%
145/80R19 28.1″ (715 mm) 0.8%
235/55R18 28.1″ (715 mm) 0.8%
345/30R20 28.2″ (716 mm) 1%
235/50R19 28.3″ (719 mm) 1.4%
295/40R19 28.3″ (719 mm) 1.4%
235/45R20 28.3″ (720 mm) 1.6%
265/40R20 28.3″ (720 mm) 1.6%
155/85R18 28.4″ (721 mm) 1.7%
265/45R19 28.4″ (721 mm) 1.7%
305/35R20 28.4″ (722 mm) 1.8%
295/45R18 28.5″ (723 mm) 2%
265/50R18 28.5″ (723 mm) 2%
345/35R19 28.5″ (725 mm) 2.3%
225/60R18 28.6″ (727 mm) 2.5%
245/55R18 28.6″ (727 mm) 2.5%
315/35R20 28.7″ (728 mm) 2.7%
275/40R20 28.7″ (728 mm) 2.7%
245/45R20 28.7″ (728 mm) 2.7%
245/50R19 28.7″ (729 mm) 2.8%

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