Bar to PSI Calculator

The US and Canada measure tank pressure in PSI. The rest of the diving world uses bar. If you rent gear abroad, read a dive computer from a different market, or talk to a dive op that quotes pressures in the other unit, this converter gets you the number you need instantly.

Type in either field below and the other updates in real time. Use the preset buttons to jump to common dive pressures.

Bar vs PSI: What's the Difference?

Both bar and PSI measure pressure, just using different reference scales. One bar is equal to atmospheric pressure at sea level — 14.504 PSI. So a tank filled to 200 bar holds about 2,901 PSI of pressure, and a tank filled to 232 bar holds about 3,365 PSI.

The divide is purely geographic. Gear manufactured and calibrated in North America uses PSI gauges. Everything else uses bar. When you rent a tank in Thailand or Indonesia, the valve label and dive op will quote bar. Your back-home computer might display PSI. Both numbers refer to the same physical reality.

Common Tank Pressures

Situation	Bar	PSI
Standard fill (most rental tanks)	200 bar	2,901 PSI
EU / Asia standard fill (12L cylinders)	232 bar	3,365 PSI
High-pressure steel tanks	300 bar	4,351 PSI
Rule of thirds — turnaround point	~133 bar	~1,929 PSI
Typical reserve pressure	50 bar	725 PSI
Absolute minimum (tank almost empty)	20 bar	290 PSI

When You'll Actually Use This

• Renting gear abroad where the gauge reads bar and your mental model is PSI
• Booking a liveaboard that quotes tank fill pressure in bar
• Checking whether a tank fill abroad meets the pressure you're used to
• Reading a dive computer set to the other unit by a previous diver
• Planning SAC rate calculations when your pressure readings are in mixed units

The Conversion

The exact conversion factor is 1 bar = 14.5038 PSI, typically rounded to 14.504 for practical use. To convert bar to PSI, multiply by 14.504. To go the other way, divide PSI by 14.504 (or multiply by 0.06895).

A quick mental shortcut: multiply bar by 15 and subtract about 3% to get close to PSI. For 200 bar: 200 x 15 = 3,000, minus 3% = roughly 2,910. Close enough for a field estimate.