Compute tire contact pressure from load and area. Inspect inflation effects with clean visual results. Fast outputs help compare road, shop, and lab cases.
Pressure = Force ÷ Area
Force from mass input: F = m × g
Per-tire force: Ftire = (Total force × Dynamic factor) ÷ Number of tires
Patch area by dimensions: A = Width × Patch length
This calculator converts the supported load into force, divides that force across the selected tire count, and then divides each tire’s force by its contact area. The result is the estimated average tire contact pressure.
The inflation comparison is optional. It helps you see whether your estimated ground contact pressure is lower, close to, or higher than the supplied inflation pressure.
| Case | Supported load | Tires | Area per tire | Contact pressure | Contact pressure |
|---|---|---|---|---|---|
| Passenger car | 1800 kg | 4 | 220 cm² | 200.59 kPa | 29.09 psi |
| Light truck | 3200 kg | 6 | 340 cm² | 153.83 kPa | 22.31 psi |
| Motorcycle pair | 950 kg | 2 | 140 cm² | 332.73 kPa | 48.26 psi |
These examples show how larger contact areas reduce average ground pressure for the same shared force.
Tire contact pressure is the average pressure transferred from a tire to the surface through its contact patch. It depends mainly on load and contact area.
No. Inflation pressure is internal tire pressure. Contact pressure is an average surface pressure estimate. Real footprints also depend on casing stiffness, tread shape, and dynamic loading.
The total supported load is divided across the selected tires. More tires sharing the same load reduce the force carried by each tire.
Use direct area when you measured the contact patch directly. Use width × patch length when you have footprint dimensions and want a quick rectangular approximation.
The dynamic factor scales the load to represent motion, bumps, braking, or impact effects. A value above 1.00 raises the effective force and the estimated contact pressure.
It supports kilograms, newtons, and pounds-force for load. It also supports common area, length, and pressure units for practical engineering use.
Pressure equals force divided by area. When the same force spreads over a larger area, the average pressure on the surface becomes lower.
No. It gives an average pressure estimate, not a full traction or terrain model. Actual performance also depends on tread, slip, soil strength, speed, and tire construction.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.