Tires and Wheels
Tire Load Capacity Calculator
Compare total tire load capacity with loaded vehicle weight. Axle-by-axle loading can overload individual tires even when total capacity appears sufficient.
Create a documented input set
Check labels, prefixes, suffixes, and percentage bases before calculating.
Where this result applies
Compare total tire load capacity with loaded vehicle weight — record the exact wheel, tire, pressure, load, and suspension configuration being checked.
Axle-by-axle loading can overload individual tires even when total capacity appears sufficient — that condition defines when total rated tire capacity is comparable with another result.
Rated capacity per tire is defined here as load capacity of one tire at the applicable pressure — keeping that definition intact requires you to use the same loaded condition for every weight and retain the scale ticket or rating source.
For Number of load-carrying tires, use the quantity described as tires sharing the vehicle load — in the vehicle record, use the same loaded condition for every weight and retain the scale ticket or rating source.
Loaded vehicle weight: Actual or estimated loaded weight — a compatible entry should use the same loaded condition for every weight and retain the scale ticket or rating source.
Preparing a comparable second case
Measure the installed component and the vehicle reference points rather than relying only on a catalog dimension — this workflow must also account for the fact that axle-by-axle loading can overload individual tires even when total capacity appears sufficient.
- Record Rated capacity per tire as load capacity of one tire at the applicable pressure — use the same loaded condition for every weight and retain the scale ticket or rating source.
- Record Number of load-carrying tires as tires sharing the vehicle load — use the same loaded condition for every weight and retain the scale ticket or rating source.
The current equation stops before the step needed to compare a proposed larger wheel and lower-profile tire with the original size, which is handled by the Plus-Sizing Tire.
Calculation method
In “total tire capacity = capacity per tire × number of tires,” the equation links rated capacity per tire, number of load-carrying tires, and loaded vehicle weight to total rated tire capacity.
No term beyond rated capacity per tire, number of load-carrying tires, and loaded vehicle weight is introduced in “total tire capacity = capacity per tire × number of tires.”
Sources of measurement error
Suspension travel, steering angle, tire growth, body tolerances, and alignment can reveal interference that a static dimension misses — for number of load-carrying tires, the page specifically expects tires sharing the vehicle load.
For a second calculation that will calculate nominal rolling circumference from tire width, aspect ratio, and wheel diameter, use the Tire Circumference.
How to compare the answer
Total rated tire capacity answers “Compare total tire load capacity with loaded vehicle weight.” The additional display, Remaining tire capacity, is a different view of the same entered measurements.
Use the tire load tables and pressure appropriate to the application — when that condition changes, compare separate calculator runs instead of blending the inputs.
Because axle-by-axle loading can overload individual tires even when total capacity appears sufficient, a disagreement between total rated tire capacity and an outside reference should trigger a review of rated capacity per tire and loaded vehicle weight.
Questions raised by this vehicle measurement
What measurement source fits Rated capacity per tire when it represents load capacity of one tire at the applicable pressure?
Because rated capacity per tire represents load capacity of one tire at the applicable pressure, use a source tied to the exact vehicle, component, and operating period described by the other fields.
How does the warning “Axle-by-axle loading can overload individual tires even when total capacity appears sufficient” affect Total rated tire capacity?
The condition “Axle-by-axle loading can overload individual tires even when total capacity appears sufficient” is not corrected automatically by the numeric inputs, so create a separate tire load capacity case when it changes.
What assumption is expressed by “total tire capacity = capacity per tire × number of tires”?
In “total tire capacity = capacity per tire × number of tires,” rated capacity per tire and number of load-carrying tires are treated as parts of one vehicle case.