Use our free Tire Height Calculator to find the overall diameter, sidewall height, and circumference of your tires. Just enter your tire size (like 225/45R17) or 33×12.50R15, and our tool will instantly calculate accurate results.
Tire Height Calculator
What Is Tire Height?
Tire height, also known as overall diameter, refers to the distance from the ground to the top of the tire when it’s properly inflated and mounted on a vehicle. It includes the rim size and twice the sidewall height.
How Tire Height Is Calculated
We use this formula:
Tire Height = (2 × Sidewall Height) + Rim Diameter
Where:
- Sidewall Height = (Tire Width × Aspect Ratio) ÷ 25.4
- Rim Diameter = Usually shown in inches (e.g., 16″, 17″, 18″)
Example:
For a 225/45R17 tire:
- Width = 225 mm
- Aspect Ratio = 45%
- Rim Size = 17 inches
- Resulting Tire Height ≈ 25 inches
Why Tire Height Matters
Knowing your tire height helps with:
- Checking speedometer accuracy
- Avoiding clearance issues
- Choosing the right size for tire upgrades
- Maintaining fuel efficiency and ride quality
Tire Height vs. Other Tire Specs
| Term | Description |
|---|---|
| Tire Width | The section width in mm (e.g., 225 mm) |
| Aspect Ratio | Sidewall height as a % of width (e.g., 45%) |
| Rim Diameter | The wheel size the tire fits (inches) |
| Tire Height | Total diameter from ground to top of tire |
| Sidewall Height | Height of just the tire’s sidewall (inches) |
| Circumference | The full outer loop of the tire (for sensors) |
FAQs
Q. How do I read tire size?
A tire marked 225/60R16 means:
- 225 mm width
- 60% sidewall ratio
- Fits 16-inch rims
Q. Can I change tire height safely?
Yes, but small differences only. Use a tire height calculator to compare and make sure your new size stays within ±3% of the original to avoid speedometer or clearance problems.
Q. Is tire height the same as tire size?
Not exactly. Tire size refers to width, aspect ratio, and rim size. Tire height is the full outer diameter calculated from that info.