Convert Standard Atmospheres (atm) to KPa
1 standard atmosphere equals 101.325 kPa.
Standard Atmosphere to KPa Converter
How to Convert Standard Atmosphere to KPa
1 standard atmosphere = 101.325 kPa exact
KPa = Standard Atmosphere × 101.325
Example: 1 atm × 101.325 = 101.325 kPa
Reverse Conversion
To convert kPa back to standard atmospheres:
- Remember, 1 kPa equals 0.00986923 standard atmospheres.
- To convert 101.325 kPa to atm, multiply
101.325 x 0.00986923, resulting in1 atm.
exact This conversion factor is exact by international definition.
Common Standard Atmosphere to KPa Conversions
| Standard Atmosphere | KPa | Actions |
|---|---|---|
| 1 standard atmosphere | 101.325 kPa | |
| 5 standard atmospheres | 506.625 kPa | |
| 10 standard atmospheres | 1013.25 kPa | |
| 25 standard atmospheres | 2533.13 kPa |
| Standard Atmosphere | KPa | Actions |
|---|---|---|
| 50 standard atmospheres | 5066.25 kPa | |
| 100 standard atmospheres | 10132.5 kPa | |
| 500 standard atmospheres | 50662.5 kPa | |
| 1000 standard atmospheres | 101325 kPa |
Standard atmospheres to kPa Conversion Table
Reference table with common standard atmospheres to kpa conversions. All values calculated with high precision.
Standard Atmospheres to KPa Table
0.0001 to 12
Standard Atmospheres to KPa Table
1 to 100000
KPa to Standard Atmospheres Table
0.1 to 500
KPa to Standard Atmospheres Table
1000 to 1 × 108
Definition of Standard Atmosphere
Atmosphere: Standard Atmospheric Pressure
The standard atmosphere (atm) is a unit of pressure defined as exactly 101,325 pascals. It represents the typical atmospheric pressure at sea level under standard conditions. The atmosphere is commonly used as a reference point for pressure measurements and is particularly important in chemistry, physics, and meteorology for defining standard conditions.
Conversions to Other Units of Measurement:
- Pascal (Pa): 1 atmosphere equals exactly 101,325 pascals. This is the definition of the standard atmosphere.
- Bar: 1 atmosphere equals exactly 1.01325 bar. The bar was designed to be close to atmospheric pressure. For example, 2 atm equals 2.0265 bar.
- PSI: 1 atmosphere equals approximately 14.6959 psi. This is a fundamental conversion for many applications. Standard atmospheric pressure is often approximated as 14.7 psi.
- Torr: 1 atmosphere equals exactly 760 torr. This relationship comes from the original definition of the torr based on mercury column height.
- Millibar (mbar): 1 atmosphere equals exactly 1013.25 millibar. This is commonly used in meteorology for weather maps.
The atmosphere provides an intuitive reference for pressure, being directly related to the air pressure we experience daily at sea level.
- Definition
- Standard unit of atmospheric pressure defined as exactly 101,325 pascals.
- Exact factor
- 1 atm = 101,325 Pa (exact)
- Common equivalents
- 1 atm = 760 torr (exact by definition)
- 1 atm = 1.01325 bar (exact)
- 1 atm ≈ 14.6959 psi
- Sources
Definition of KPa
Kilopascal: A Practical SI Pressure Unit
The kilopascal (kPa) is an SI-derived unit of pressure equal to 1,000 pascals. It provides a more practical scale than the pascal for many everyday and industrial applications. The kilopascal is commonly used for tire pressure specifications (especially outside North America), blood pressure measurements in some countries, and weather reports in metric countries.
Conversions to Other Units of Measurement:
- Pascal (Pa): 1 kilopascal equals exactly 1,000 pascals. This is the fundamental relationship. For example, atmospheric pressure (101.325 kPa) equals 101,325 Pa.
- Bar: 1 kilopascal equals exactly 0.01 bar. This simple conversion makes kPa convenient for calculations. For example, 250 kPa equals 2.5 bar.
- PSI: 1 kilopascal equals approximately 0.145038 psi. This conversion is important for automotive applications. For example, a tire specification of 220 kPa equals approximately 32 psi.
- Atmosphere (atm): 1 kilopascal equals approximately 0.00986923 atm. Standard atmospheric pressure equals 101.325 kPa.
- Millibar (mbar): 1 kilopascal equals exactly 10 millibar. This conversion is used in meteorology.
The kilopascal offers a good balance between the small pascal and larger units, making it ideal for many practical pressure measurements.
- Definition
- SI-derived pressure unit equal to 1,000 pascals (10³ Pa).
- Exact factor
- 1 kPa = 1,000 Pa (exact); 1 kPa = 0.01 bar (exact)
- Common equivalents
- 1 kPa = 10 mbar (exact)
- 1 kPa ≈ 0.145038 psi
- 101.325 kPa = 1 atm (exact)
- Sources
About the Standard Atmosphere
Facts & Uses
- 1 atm = 101,325 Pa exactly — the standard reference for sea-level atmospheric pressure, defined by the 10th CGPM in 1954.
- Used as a reference pressure in chemistry, physics, and meteorology. Many gas calculations use atm as the unit of choice.
- Defines standard temperature and pressure (STP) in older chemistry conventions: 0 °C and 1 atm. (IUPAC since 1982 uses 100 kPa instead.)
- Reference for scuba and diving tables: 1 atm of pressure increase for every 10 m of seawater (or 33 ft).
Curiosities
- The standard atmosphere is an arbitrary reference — actual sea-level pressure varies daily by ±50 hPa based on weather systems.
- The 10th CGPM (1954) chose 101,325 Pa exactly to align with the historical definition based on a 760 mm column of mercury at 0 °C and standard gravity.
- The pressure at the top of Mount Everest is about 0.33 atm (33.7 kPa) — only one-third of sea level, which is why supplemental oxygen is essential above 8000 m.
- Approximate equivalents: 1 atm = 14.696 psi = 1.01325 bar = 760 mmHg = 760 torr.
Sources
About the KPa
Facts & Uses
- 1 kPa = 1000 Pa exactly. The most practical metric unit for everyday pressures: tire pressure, blood pressure, weather, and engineering.
- Standard for tire pressure in metric markets — typical car tire is 200-250 kPa (≈ 30-36 psi).
- Blood pressure can be expressed in kPa: 16/10.7 kPa ≈ 120/80 mmHg (the international SI standard, though clinicians still prefer mmHg).
- Weather: standard atmospheric pressure is 101.325 kPa; storm warnings often start below 100 kPa at sea level.
Curiosities
- Kilopascals are preferred over hectopascals in engineering and tire-pressure contexts because the round numbers are more intuitive (250 kPa vs 2500 hPa).
- The kilopascal replaced the kilogram-force per square centimeter (kgf/cm²) in most international standards after metrication in the 1970s-80s.
- A 10 kPa pressure differential is roughly the suction force of a typical household vacuum cleaner.
- Approximate equivalents: 100 kPa ≈ 14.5 psi ≈ 0.987 atm ≈ 750 mmHg.
Sources
Frequently Asked Questions
How many kPa are in one standard atmosphere?
One standard atmosphere equals 101.325 kPa. To convert, multiply the standard atmosphere value by 101.325. For the reverse, divide the kPa value by 101.325 (or multiply by 0.00986923).
What is 1 standard atmosphere in kPa?
1 standard atmosphere = 101.33 kPa. This is one of the most commonly searched conversions for this pair.
How precise is the standard atmosphere-to-kPa conversion?
The factor 101.325 is accurate to 6 significant figures, derived from international measurement standards. Our calculator uses full precision internally.
Looking for the reverse? Convert KPa to Standard Atmosphere
Related Pressure Converters
Explore other pressure conversion tools:
Related in other categories:
- Liters to Gallons — Pressure × volume in gas law
