Tire Pressure vs Load Calculator
Enter your vehicle's weight and tire specs to find the correct PSI range for your actual load, whether you're empty, fully loaded, or towing.
See also: Towing Capacity Checker to verify your hitch weight before entering tongue weight here.
Calculate recommended tire pressure
Enter your vehicle's total weight, tire max load rating, and max pressure to get a safe PSI recommendation.
35–38 PSI recommended
Vehicle loaded to 71% of tire capacity.
How to use this calculator
Enter your total loaded vehicle weight (curb weight plus all passengers, cargo, and tongue weight if towing). Select the number of tires sharing the load. Enter your tire's max load rating and max PSI from the sidewall, plus the OEM door placard PSI. The calculator computes load per tire as a percentage of the tire's max rating, then interpolates a recommended PSI range between the door placard baseline and the max sidewall pressure.
Tips for success
- Check cold: Always check tire pressure before driving more than a mile. Pressure rises 4–8 PSI when hot; adjusting hot tires leaves them under-inflated when they cool.
- Placard is the baseline: The door placard PSI is calibrated for typical load. When heavily loaded, add 2–4 PSI above the placard recommendation.
- Sidewall max is a limit, not a target: Never inflate above the sidewall "Max Press" value. It is the structural limit of the tire casing, not a recommended inflation level.
- Under vs. over-inflation effects: Under-inflation causes flex, heat buildup, and outer edge wear. Over-inflation reduces contact patch, harshens the ride, and wears center tread.
- Check monthly: Tires naturally lose 1–2 PSI per month through normal permeation, even with no leaks.
Practical note
Where to find your tire load and pressure ratings
- Door jamb placard: Lists the OEM recommended PSI for front and rear tires at standard load. This is your baseline starting point.
- Tire sidewall: Shows "Max Load XXXX lbs" and "Max Press XX PSI." These are the tire's structural limits, not recommended operating values.
- Owner's manual: May include a load-inflation table, especially for trucks, vans, and SUVs with variable load requirements.
FAQ
Should I inflate to the max PSI on the tire sidewall?
No. The sidewall max PSI is the structural limit of the tire, it is not a recommended operating pressure. Running at max PSI creates a small, stiff contact patch that reduces braking and handling performance and increases blowout risk if the tire is struck. Always inflate to the door placard recommendation, adjusted upward only when carrying significantly heavier-than-normal loads.
How much does payload affect required tire pressure?
Significantly for trucks, vans, and cargo vehicles. A half-ton pickup at curb weight may need 35 PSI in the rear; loaded to max payload, the manufacturer may recommend up to 60–65 PSI in the rear. Always check the door placard for payload-specific pressure guidance, many trucks have a separate "loaded" PSI recommendation.
Does towing affect the tires on my vehicle (not the trailer)?
Yes. Tongue weight (typically 10–15% of trailer weight) loads the rear axle of your tow vehicle. For a 6,000 lb trailer with 750 lbs of tongue weight, your rear tires are carrying 375 lbs more than normal. Increase rear tire pressure by 2–4 PSI when towing near max capacity.
Why do front and rear tires sometimes have different recommended pressures?
Front tires carry more weight in front-heavy vehicles (front-wheel drive, engine placement) and are responsible for steering. Rear tires bear cargo and passenger weight in the back seat and trunk. The door placard typically specifies front and rear pressures separately to optimize wear, handling, and load distribution for your specific vehicle design.