Earn $25 CASH per qualified ChartSnap Founder referral · Unlimited referrals · No purchase required —Join the Affiliate Program →
How we measure the air pressure around us — and why weather maps use millibars.
Atmospheric pressure at sea level is about 101,325 pascals, which equals 1.01325 bar, 14.696 PSI, or 760 mmHg. This 'standard atmosphere' is a reference point for all pressure comparisons.
Meteorology uses millibars (mbar) or hectopascals (hPa) — the same number. Typical sea-level pressure ranges from about 990 mbar (stormy) to 1,030 mbar (fair).
| Unit | Sea-level value |
|---|---|
| Pascals | 101,325 |
| Kilopascals | 101.3 |
| Bar | 1.013 |
| PSI | 14.696 |
| mmHg | 760 |
Atmospheric pressure is the weight of the air above you; as you climb, there's less air above, so pressure falls. At 5,500 m it's about half of sea level.
The Wizard Network
Discover our family of free, no-signup calculators and tools for finance, real estate, crypto, writing, and more.
Investment, retirement, FIRE, passive income, and wealth-building calculators.
Mortgage, refinance, affordability, PMI, amortization, and homeownership tools.
DCA, market cap, staking, profit-taking, portfolio, and crypto planning tools.
Educational resource for learning to read charts — candlesticks, patterns, indicators, and technical analysis for any market.
Writing, editing, SEO, readability, grammar, and content optimization tools.
Date calculations, business days, age calculators, schedules, timelines, and planning tools.
Unit converters, measurement calculators, reference tables, and conversion guides.
Financial planning, investing, retirement, passive income, and wealth-building simulators.