Tyre Pressure Calculator

Convert pressure units, calculate load-based pressure, and adjust for altitude & temperature

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Tyre Pressure Unit Converter

Enter Value

Unit

PSI

2.206

Bar

220.6

kPa

2.25

kg/cm²

Tyre Pressure Guidelines & Tips

Optimal Pressure Benefits

✓Better fuel economy
✓Extended tire life
✓Improved handling
✓Enhanced safety
✓Better braking performance

Under-inflation Effects

✗Increased fuel consumption
✗Premature tire wear
✗Poor handling
✗Risk of tire failure
✗Increased heat buildup

Over-inflation Effects

!Harsh ride quality
!Center tread wear
!Reduced traction
!Impact damage risk
!Uneven contact patch

Top Brand Tyre Pressure Reference Guide

Reference pressures for popular tyre brands by vehicle category. Always consult your vehicle manual for manufacturer specifications.

1Michelin

Tyre Size	Front PSI	Rear PSI	Load Index	Speed Rating
185/60R15	32 PSI	30 PSI	84H	H
195/65R15	33 PSI	32 PSI	91H	H
205/55R16	34 PSI	32 PSI	91V	V
215/60R16	35 PSI	33 PSI	95H	H
225/50R17	36 PSI	34 PSI	94W	W

2Bridgestone

Tyre Size	Front PSI	Rear PSI	Load Index	Speed Rating
185/60R15	32 PSI	30 PSI	84H	H
195/65R15	33 PSI	32 PSI	91H	H
205/55R16	34 PSI	32 PSI	91V	V
215/60R16	35 PSI	33 PSI	95H	H
225/45R17	36 PSI	34 PSI	91W	W

3Continental

Tyre Size	Front PSI	Rear PSI	Load Index	Speed Rating
185/65R15	32 PSI	30 PSI	88H	H
195/60R15	33 PSI	32 PSI	88H	H
205/55R16	34 PSI	32 PSI	91V	V
215/55R16	35 PSI	33 PSI	93V	V
225/50R17	36 PSI	34 PSI	94V	V

Important Reference Notes

General Guidelines:

• These are reference pressures only
• Always check your vehicle door jamb for OEM specs
• Adjust for load, temperature, and driving conditions
• Check pressure when tyres are cold

Category Explanations:

• Commercial: Light commercial vehicles, vans, bakkies
• C-rating: Commercial load rating designation
• Load Index: Maximum load capacity rating
• Speed Rating: Maximum sustained speed capability

Quick Conversion Chart

PSI	Bar	kPa	kg/cm²
20	1.379	137.9	1.406
25	1.724	172.4	1.758
30	2.068	206.8	2.109
32	2.206	220.6	2.25
35	2.413	241.3	2.461
40	2.758	275.8	2.812
45	3.103	310.3	3.164
50	3.447	344.7	3.515

Understanding Tyre Pressure & Load Capacity

Finding Your Vehicle's Specifications

Your vehicle's driver-side door jamb contains crucial information including the original equipment tyre size, load rating, and recommended tyre pressures for both front and rear tyres. These specifications have been precisely engineered by the manufacturer to deliver optimal load capacity, ensuring the best possible tyre wear patterns and ride comfort.

Tyre load capacity has a direct correlation with air pressure levels. When tyre pressure increases or decreases, the load-carrying capability of the tyre changes accordingly. Excessive air pressure can cause uneven centre wear and create handling instability, while insufficient pressure leads to outer edge wear and reduces the tyre's load capacity below the manufacturer's engineered specifications.

Frequently Asked Questions

When should I check my tire pressure?

Check tire pressure when tires are cold, preferably before driving or at least 3 hours after driving. Temperature affects pressure readings significantly.

How often should I check tire pressure?

Check tire pressure at least once a month and before long trips. Tires naturally lose 1-2 PSI per month under normal conditions.

Where can I find my vehicle's recommended tire pressure?

Check the driver's door jamb sticker, owner's manual, or glove compartment. Don't use the maximum pressure printed on the tire sidewall.

Should front and rear tires have the same pressure?

Not necessarily. Many vehicles require different pressures for front and rear tires due to weight distribution. Always follow manufacturer recommendations.

How does load affect tire pressure?

Heavier loads require higher tire pressure to maintain proper contact patch and prevent overheating. Increase pressure according to load index tables or manufacturer guidelines.