Pressure Converter
Convert between PSI, Bar, Pascal, and Atmospheres. Perfect for tires, physics, and deep-sea diving calculations.
Metric & Science
Industrial & Imperial
Pressure Depth Context
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Mastering Pressure
Pressure is the invisible force that keeps our tires inflated, our weather dynamic, and our coffee delicious. Whether you are inflating a bicycle tire (80 PSI) or diving into the ocean (increasing 1 atm every 10 meters), understanding these units is crucial for safety and precision.
Advanced Tool Features
Tire Guide
Switch to the "Tire Guide" tab to instantly see recommended pressure ranges for cars, bikes, and trucks.
Atmosphere Context
Understand pressure relative to sea level. 101.3 kPa is exactly 1 atm, the weight of air above you right now.
Deep Sea Depth
Our visualizer converts pressure into underwater depth. 200 Bar isn't just a number—it's 2,000 meters deep!
Industrial Units
Full support for Bar, kPa, and MPa, ensuring compatibility with all modern industrial pressure gauges.
Everyday Presets
One-click values for everyday items like Espresso Machines (9 Bar) or Car Tires (32 PSI).
Vacuum Ready
Includes Torr (mmHg) for vacuum and scientific applications requiring high precision below 1 atm.
How to Use
- Converter Tab: Type any value (e.g. 35 PSI). All other fields (Bar, kPa) update instantly.
- Tire Guide: Switch to the 🚗 tab. Click "SUV" or "Bike" to see the safe pressure range.
- Visualizer: The dark box at the bottom shows "Depth Context". See how deep you'd have to dive to experience that pressure.
Common Mistakes
- Confusing PSI and Bar.
1 Bar is NOT 1 PSI. 1 Bar is nearly 15 PSI. Putting 30 Bar in a tire (instead of 30 PSI) would cause a dangerous explosion.
- Ignoring "Cold" Pressure.
Tire specs are for "Cold" tires (parked for 3+ hours). Driving heats up the air, increasing pressure by 3-5 PSI. Never bleed air from a hot tire!
Pro Tips
- The "Thumb Rule" for Conversion.
To get from Bar to PSI quickly in your head, multiply by 15 (it's actually 14.5, but 15 is a safe overestimate for tank limits).
- Absolute vs Gauge.
If you are doing scientific calculations, remember to add 14.7 psi (1 atm) to your gauge reading to get Absolute Pressure (psia).
Frequently Asked Questions
Expert answers to your pressure questions.
How many PSI in 1 Bar?
1 Bar is approximately equal to 14.5038 PSI. This is roughly equivalent to the atmospheric pressure at sea level (which is 1.013 Bar).
What is the standard tire pressure for a car?
For most passenger sedans, it is 32 to 35 PSI (2.2 - 2.4 Bar). For SUVs, it can be higher (35-40 PSI). Always check the sticker inside your driver's side door for the exact spec.
Why does tire pressure drop in winter?
Pressure drops by about 1 PSI for every 10°F (6°C) drop in temperature. Cold air is denser and takes up less volume. Always check your tires when the weather turns cold!
What is 1 Pascal (Pa)?
One Pascal is a force of one Newton per square meter. It is a very small unit. For example, the pressure of a dollar bill resting on a table is roughly 1 Pascal.
Atmosphere (atm) vs Bar: What is the difference?
They are very close but not identical. 1 atm = 1.01325 Bar. 'Atmosphere' is based on the average air pressure at sea level, while 'Bar' is a metric unit defined as exactly 100,000 Pascals.
What is the pressure at the bottom of the Mariana Trench?
At approximately 11,000 meters deep, the pressure is over 1,000 atmospheres (roughly 15,000 PSI). That's like having an elephant stand on your thumb.
How do I convert PSI to kPa?
Multiply PSI by 6.895. For example, 30 PSI × 6.895 ≈ 207 kPa. This is useful because many modern tire gauges use kPa.
What is 'Gauge Pressure' (psig)?
Gauge pressure measures pressure relative to the ambient atmosphere, not zero. Your tire gauge reads '0' at sea level, but actual absolute pressure is 14.7 psi. Most industrial tools use Gauge Pressure.
Can I use bike tires on a car?
No! Bike tires run at much higher pressures (80-120 PSI) but support less weight. Car tires run at lower pressure (32 PSI) but have a huge surface area to support thousands of pounds.
What is 1 Torr?
1 Torr is exactly 1/760th of a standard atmosphere. It was historically based on the pressure exerted by a 1 millimeter column of mercury (mmHg). It is used primarily in vacuum physics.
What pressure is needed for Espresso?
True espresso requires 9 Bars of pressure (roughly 130 PSI) to force hot water through the coffee puck. This emulsifies the oils to create the 'crema'.
Is high blood pressure related to PSI?
Yes, but it's measured in mmHg. Standard blood pressure is 120/80 mmHg.Converted to PSI, 120 mmHg is only 2.3 PSI. Our bodies operate at very low pressures compared to tires!