How to use
- Enter empty-vehicle axle loads, then add the payload and its front split.
- Set tire counts per axle (2 for single, 4 for dual).
- Enter placard cold pressures and optional tire limits.
- Tune the exponent α and safety margin for your scenario.
- Optionally enter current tire temperature to get a set-now value.
Tip: Use portable scales or a weighbridge for most accurate axle loads.
FAQs
It scales the placard pressure by the ratio of actual to reference per-tire load using an exponent α, then adds an adjustable safety margin. This approximates how load affects required inflation.
The tool caps pressures at the provided tire max cold pressure and flags a warning. If loads exceed tire rated load, reduce load or use tires with higher capacity.
The calculator outputs a cold target and, if you enter current temperature, a set-now value using ideal-gas scaling. For best accuracy, set pressures when tires are cold.
Use a weighbridge to measure front and rear axles empty and loaded. If unknown, a 50% split is a reasonable starting point but weighing is recommended.
Yes. Set tires per axle to 4 for duals. Enter tire maximums and adjust α if using manufacturer load–pressure tables for better alignment.