P225/45R14 Tire Size in Inches & Millimeters

Tire size “225/45R14” indicates your vehicle’s specifications based on tire width, aspect ratio, height, tire construction, diameter, radial and inches. These tire size numbers represent our tire sizes in both Metric (in millimeters) and Imperial (in inches) units of measurement to help find the correct tire size for your vehicle.

To convert tire size P225/45R14 to inches, you must know what these numbers represent.

So let us know P225/45R14 in simple words:

First number “225” indicates the tire’s width in millimeters.
Second number “45” refers to the aspect ratio, which is the height of the tire’s sidewall as a percentage of its width.
Third number “R14” refers to a tire that is designed to fit a 14-inch diameter rim.

Therefore, when converting the tire size P225/45R14 to inches, it can be concluded that the width of the tire will be approximately 8.9 inches ( 225 mm= 8.9 in), and the sidewall height will be approximately 4 inches (45% of 8.9 inches = 4 inches).

How to convert P225/45R14 into Inches (imperial)?

To convert tire size P225/45R14 to inches (Imperial) –

1. Width conversion: To convert it to inches, you can use a conversion factor of approximately 25.4 millimeters per inch.

  • 225 millimeters/25.4 = approximately 8.9 inches
    So, the width of the tire is approximately 8.9 inches.

2. Aspect Ratio Calculation: To calculate sidewall height in inches, you can use the tire width (from Step 1) and the aspect ratio:

  • Sidewall Height = Width (in inches) * Aspect Ratio / 100
  • Sidewall Height = 8.9 inches * 45/100 = approximately 4 inches
    So, the tire sidewall height is approximately 4 inches.

3. Rim Diameter: The “R” in the tire size stands for “radial construction” and the last number “14” indicates the rim diameter in inches. In this case, it’s already in inches.
So, the converted tire size “P225/45R14” in inches (imperial) is approximately:

  • Width: 8.9 inches
  • Sidewall Height: 4 inches
  • Rim Diameter: 14 inches

How to convert P225/45R14 into Millimeters (metric)?

To convert the tire size P225/45R14 into millimeters (metric) –

1. Width Conversion: The first number in the tire size, “225“, represents the tire’s width in millimeters. Since it’s already in millimeters, there’s no need for conversion.

  • Width: 225millimeters

2. Aspect Ratio Calculation: The second number “45” is the aspect ratio, representing the tire’s sidewall height as a percentage of its width. To calculate the sidewall height in millimeters, you can use the tire’s width (from step 1) and the aspect ratio:

  • Sidewall height = Width (in millimeters) * Aspect Ratio / 100
  • Sidewall height = 225 millimeters * 45 / 100 = 101 mm millimeters
    So, the tire’s sidewall height is approximately 101 mm millimeters.

3. Rim Diameter: The “R” in the tire size stands for “radial construction” and the last number, “14” indicates the rim diameter in inches. To convert this to millimeters, you can use the conversion factor of approximately 25.4 millimeters per inch.

  • Rim diameter = 14 inches * 25.4 millimeters per inch = 356 mm millimeters
    So, the rim diameter is approximately 356 mm millimeters.

So, the converted tire size “P225/45R14” in millimeters (metric) is approximately:

  • Width: 225 mm
  • Sidewall Height: 101 mm
  • Rim Diameter: 356 mm

Alternate Tire Size of P225/45R14 For replacement

Tire Size Overall Diameter Difference
185/50R14 21.3″ (542 mm) -2.9%
115/70R15 21.4″ (543 mm) -2.7%
145/65R14 21.4″ (544 mm) -2.5%
185/45R15 21.5″ (547 mm) -2%
165/50R15 21.5″ (547 mm) -2%
215/40R15 21.8″ (553 mm) -0.9%
245/35R15 21.8″ (553 mm) -0.9%
165/60R14 21.8″ (554 mm) -0.7%
165/45R16 21.8″ (554 mm) -0.7%
215/35R16 21.9″ (556 mm) -0.4%
195/45R15 21.9″ (557 mm) -0.2%
125/70R15 21.9″ (557 mm) -0.2%
175/50R15 21.9″ (557 mm) -0.2%
155/65R14 22″ (558 mm) 0%
185/55R14 22″ (560 mm) 0.4%
195/40R16 22.1″ (562 mm) 0.7%
205/50R14 22.1″ (562 mm) 0.7%
165/55R15 22.2″ (563 mm) 0.9%
205/45R15 22.2″ (565 mm) 1.3%
175/60R14 22.3″ (566 mm) 1.4%
185/50R15 22.3″ (567 mm) 1.6%
155/60R15 22.3″ (567 mm) 1.6%
115/70R16 22.4″ (568 mm) 1.8%
135/60R16 22.4″ (568 mm) 1.8%
145/65R15 22.4″ (569 mm) 2%
195/55R14 22.4″ (570 mm) 2.2%
205/40R16 22.4″ (570 mm) 2.2%
165/65R14 22.4″ (570 mm) 2.2%
135/70R15 22.5″ (571 mm) 2.3%
165/50R16 22.5″ (572 mm) 2.5%
135R14 22.5″ (572 mm) 2.5%
135/80R14 22.5″ (572 mm) 2.5%
175/55R15 22.6″ (573 mm) 2.7%
275/35R15 22.6″ (573 mm) 2.7%
155/70R14 22.6″ (574 mm) 2.9%

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