Tire Pressure Converter

Tool Guide

Tool Overview

The Online Tire Inflation Calculator can quickly convert the tire pressure unit marked on a tire into other, easier-to-understand units, supporting free conversion between psi, bar, and kpa.

Whether for a bicycle, electric bike, or car, the importance of tire pressure to safe driving is self-evident, and regularly checking tire pressure or inflating tires is one of our essential daily car safety tasks.

We often hear technicians say things like inflate to 2.5 kg, inflate to 2.5 bar, inflate to 33 psi, inflate to 230 kPa—do you know what all these tire pressure expressions actually mean?

Among common tire pressure representations, there are 3 types: psi, bar, and kpa. What are the differences between them?

1. psi, full name Pounds per square inch, where P is pound, S is square, and I is inch, with the unit "lb/in²" and the Chinese name "pound/square inch." psi is mainly a unit commonly used in Europe and America and is rarely used domestically.

2. bar, Chinese name "ba," is mainly a tire pressure unit used domestically. The conversion formula is: 1 bar = 1 standard atmosphere (atm) = 1 kgf/cm².

3. kpa, Pa is Pascal, representing the pressure of one Newton acting on one square meter. 1 bar = 100 kpa

Tire pressure is not fixed and needs to be flexibly adjusted according to the actual cargo load and season. Never let a tire stay in an underinflated state, or it will greatly affect the tire's service life and driving experience.