Tire Pressure Calculator
Enter your axle weights and tire specs to instantly calculate the recommended inflation pressure for your front and rear tires.
Axle weights
Tire specifications
| Tire Size | Max Load | Max PSI |
|---|---|---|
| 11R22.5 | 6,175 lbs | 110 psi |
| 11R24.5 | 6,610 lbs | 110 psi |
| 295/75R22.5 | 6,000 lbs | 110 psi |
Axle load utilization (% of tire max load per tire)
Calculate Your Optimal Tire Pressure
Maintaining optimal tire pressure is essential for the safe and efficient operation of your semi truck. Our easy-to-use calculator helps truck owners and operators estimate the recommended tire pressure for both front and rear tires.
The formula accounts for how much weight each axle actually carries relative to the tire’s rated capacity, then scales the recommended pressure accordingly. Run the calculation separately for each axle — front and rear axles carry very different loads.
Front (Steer) Axle Pressure
Based on the total weight on your steer axle and the maximum load/pressure ratings of your front tires. Steer tires typically run at higher pressure due to the concentrated load point.
Pressure = (Front Axle ÷ Max Load) × Max PSI
Rear (Drive) Axle Pressure
Drive axle tires handle the bulk of the payload, so pressure is proportionally higher. Use the same tire max load and max PSI values — only the axle weight changes.
Pressure = (Rear Axle ÷ Max Load) × Max PSI
Always check pressure cold. Tire pressure increases as tires heat up during driving. Measure and set pressure before driving more than one mile for the most accurate reading. A tire that was just driven can read 10–15 PSI higher than its true cold pressure.
Where to Find Your Tire’s Max Load and Max Pressure
The maximum load and maximum pressure of the tire are usually printed on the tire’s sidewall. Be sure to check both to obtain the right pressure. If you’re using tubeless tires, it’s essential to note that they’re highly sensitive to pressure, especially if your tires don’t follow typical European Tyre and Rim Technical Organization (ETRTO) specifications and/or have hookless rims.
🔍 Tire Sidewall
- Primary source for all ratings
- Look for “MAX LOAD” in lbs/kg
- Look for “MAX PRESS” in PSI
- Both values required for the formula
📋 Owner’s Manual
- Manufacturer tire specifications
- Recommended inflation tables
- Load range charts by axle
- OEM-approved tire sizes
🌐 Tire Manufacturer
- Full inflation pressure tables
- Load/inflation data by tire size
- Technical service bulletins
- Tubeless-specific guidance
Why Tire Pressure Matters for Safety and Costs
Tire pressure directly affects your fuel economy, tire life, handling, and safety. Running at the wrong pressure — even slightly — compounds over thousands of miles into real costs and real risks.
Wider tires typically require less pressure. More weight doesn’t always mean more pressure — a wider footprint distributes load differently. Always cross-reference the tire manufacturer’s load-inflation tables for your specific tire model and size, as results from this calculator are estimates.
Frequently Asked Questions
Use this formula: Recommended Tire Pressure = (Axle Weight / Tire Maximum Load) × Tire Maximum Pressure. Get the axle weight in pounds, read the tire’s maximum load and maximum pressure from the sidewall, then divide and multiply as shown. Run the calculation separately for the front and rear axles.
The front axle weight is the total weight supported by the front (steer) axle of the truck, while the rear axle weight is the total weight supported by the rear (drive) axle. These values differ substantially on a loaded semi — the drive axle typically carries far more weight than the steer axle, which is why each produces a different recommended tire pressure.
It’s recommended to check your truck’s tire pressure at least once a month and before long trips. It’s important to note that the more weight, the more pressure needed. Though, wider tire widths typically require less pressure. Always measure pressure when tires are cold for the most accurate reading.
Tubeless truck tires are highly sensitive to pressure. Extra care is advised if your setup doesn’t follow ETRTO or Effective Rim Diameter specifications, or if you use hookless rims. Always verify sidewall ratings and ensure component compatibility before setting pressures.
Yes, you can use this calculator for other types of vehicles as long as you know the weight on the front and rear axles, as well as the tire’s maximum load and maximum pressure. Just keep in mind that the results may not be as accurate for vehicles with significantly different tire ratings than trucks. These estimates should be used as starting points — it may require some experimentation and research to find the ideal tire pressure based on your vehicle, load types, terrain, and other factors.
Safety starts before the inspection.
Fleetworthy helps fleets and owner-operators manage DOT compliance, reduce toll costs, and bypass weigh stations — all in one platform.
This calculator provides estimates based on user-entered values and standard tire pressure formulas. Results do not constitute engineering or safety advice. Always verify against your tire manufacturer’s inflation tables and comply with all applicable vehicle and safety regulations. Fleetworthy is not liable for decisions made based on calculator output. Contact our team for fleet compliance support.