Convert Standard Atmospheres to Hectopascals
Standard Atmosphere (atm) to Hectopascal (hPa) unit conversion — enter any value below to get an instant result, or use the table for common values.
Results from this calculator are estimates provided for general informational purposes only, based on formulas, rates, and standards commonly accepted as of 2026. Figures may differ slightly from other calculators or professional sources due to rounding methods, differing assumptions, or regional regulations, and rules may change over time. Always consult a qualified professional — such as a financial advisor, healthcare provider, or other relevant specialist — before making decisions based on these results.
Result
1 atm = 1013.25 hPa
1 Standard Atmosphere = 1013.25 Hectopascals
1 Hectopascal = 0.00098692327 Standard Atmospheres
1 atm in every supported unit
Conversion chart: Standard Atmosphere to Hectopascals
Conversion table
| Standard Atmosphere (atm) | Hectopascal (hPa) |
|---|---|
| 0.01 atm | 10.1325 hPa |
| 0.1 atm | 101.325 hPa |
| 1 atm | 1013.25 hPa |
| 2 atm | 2026.5 hPa |
| 3 atm | 3039.75 hPa |
| 5 atm | 5066.25 hPa |
| 10 atm | 10132.5 hPa |
| 20 atm | 20265 hPa |
| 50 atm | 50662.5 hPa |
| 100 atm | 101325 hPa |
| 1000 atm | 1013250 hPa |
Standard Atmosphere (atm)
Definition: Defined as exactly 101,325 pascals, representing the average atmospheric pressure at sea level on Earth.
History: Originally based on the height of a column of mercury observed by 17th-century scientists such as Evangelista Torricelli, and later fixed to a precise pascal value for scientific consistency.
Current use: Used as an intuitive reference point in chemistry, physics, and aviation to describe pressures relative to normal sea-level conditions, such as cabin pressurization or gas-law calculations.
Hectopascal (hPa)
Definition: Equal to 100 pascals, numerically identical to the millibar, which makes the two units directly interchangeable.
History: Adopted by meteorologists in the late 20th century as the SI-compliant replacement for the millibar, after forecasters had already grown accustomed to the millibar's numeric scale.
Current use: Used in meteorology for barometric pressure — weather services outside the United States report atmospheric pressure and storm intensity, such as a hurricane's central pressure, in hectopascals.
Supported Units
| Unit | Symbol | In Pascals |
|---|---|---|
| Pascal | Pa | 1 Pa |
| Kilopascal | kPa | 1000 Pa |
| Megapascal | MPa | 1000000 Pa |
| Hectopascal | hPa | 100 Pa |
| Bar | bar | 100000 Pa |
| Millibar | mbar | 100 Pa |
| Pound per Square Inch | psi | 6894.7573 Pa |
| Standard Atmosphere | atm | 101325 Pa |
| Torr | Torr | 133.32237 Pa |
| Inch of Mercury | inHg | 3386.38 Pa |
About These Parameters
- Value
- The pressure reading you want to convert, expressed in the "From" unit. Accepts decimals.
- From Unit
- The pressure scale your input value is currently measured in — for example, PSI on a US tire gauge or hectopascals on a weather report.
- To Unit
- The pressure scale you want the result converted into. Use the swap button to flip From and To instantly.
How Pressure Conversion Works
The Formula
Every unit here is defined by a fixed multiplier relative to the pascal. To convert a value from one unit to another:
result = value × (factor of "From" unit ÷ factor of "To" unit)
For Standard Atmosphere → Hectopascal: multiply by 1013.25. For example, 1 atm × 1013.25 = 1013.25 hPa.
SI vs. Customary Units
The metric units on this page — pascal, kilopascal, megapascal, hectopascal, bar, and millibar — all scale by powers of ten, so converting between them is just moving a decimal point. PSI is a US customary unit built from pounds-force and square inches, unrelated to the metric scale, while torr and inches of mercury are older manometer-based units defined by the height of a mercury column a pressure could support — each needs its own precise multiplier rather than a round decimal shift.
Why Atmospheric Pressure Matters
Standard atmospheric pressure — 101,325 Pa, or 1 atm — is the reference point most pressure units are built around, because it is the pressure every person and machine on Earth's surface experiences by default. Meteorologists track small deviations from this baseline, measured in hectopascals or millibars, to forecast weather: a falling barometer reading signals an approaching low-pressure system and possible storms, while a rising one signals clear, stable conditions.
Example
1 atm equals 1013.25 hPa. For scale, that's about 1× standard atmospheric pressure (1 atm, or 1 atm) — roughly the pressure difference a typical car tire holds above the surrounding air (about 32 psi, or 2.2 bar).
Frequently Asked Questions
How many Hectopascals are in 1 Standard Atmosphere?
1 Standard Atmosphere (atm) equals exactly 1013.25 Hectopascals (hPa).
Why do US tire gauges use PSI?
The United States never mandated metrication, so pounds and inches stayed the default units for everyday measurement, including the pound-force-per-square-inch pressure scale used on tire gauges, plumbing fixtures, and compressed air tools. Most of the rest of the world reads the same measurement in bar or kilopascals.
What's the difference between a bar and an atmosphere?
A bar is a round metric unit equal to exactly 100,000 pascals, chosen for convenient arithmetic; a standard atmosphere is fixed at exactly 101,325 pascals, the measured average air pressure at sea level. The two are close — 1 atm is about 1.01325 bar — but they are defined differently and are not interchangeable in precise scientific work.
How accurate are these conversions?
Every conversion factor used here is the exact, internationally standardized value (e.g. 1 atm = exactly 101,325 Pa, and 1 psi = exactly 6,894.7572931783 Pa) — results are limited only by floating-point display precision, not by rounded conversion constants.