Convert Pounds per Square Inch to Millibars
Convert Pounds per Square Inch (psi) to Millibars (mbar) instantly and accurately.
Conversion Formula
mbar = psi × 68.94757293
About Pounds per Square Inch
One pound per square inch (psi) ≈ 6,894.76 Pa - the dominant pressure unit in US industry and consumer products. Car tyres: 32-36 psi; truck tyres 80-120 psi; bicycle road tyres 80-130 psi. Home water supply: 40-80 psi; residential maximum 80 psi per plumbing code. Compressed air tools: 90-150 psi. Steam autoclave sterilisation: 15-30 psi. The distinction between gauge (psig) and absolute (psia) pressure is critical: gauge pressure is relative to ambient; absolute = gauge + ~14.696 psi. 1 psi = 6,894.76 Pa.
About Millibars
A millibar (mbar) = 100 Pa = 1 hPa - the historically dominant meteorological pressure unit. Standard sea-level pressure is 1013.25 mbar. Hurricane intensity is characterised by central pressure: Category 5 storms typically below 920 mbar (US record: 892 mbar, 1935). Upper-air analysis levels - 850, 700, 500, 300, 200 mbar - appear throughout decades of archived meteorological data. Aircraft cabins are pressurised to ~750-800 mbar at cruise altitude. 'Weather bombs' see pressure fall 24+ mbar in 24 hours. 1 mbar = 100 Pa.
Quick Reference Table
| Pounds per Square Inch (psi) | Millibars (mbar) |
|---|---|
| 1 psi | 68.9476 mbar |
| 2 psi | 137.895 mbar |
| 5 psi | 344.738 mbar |
| 10 psi | 689.476 mbar |
| 25 psi | 1723.69 mbar |
| 50 psi | 3447.38 mbar |
| 100 psi | 6894.76 mbar |