A standard atmosphere is exactly 101,325 pascals.
Atmospheres to KSI Converter — atm to ksi
Convert Atmosphere (atm) to KSI (ksi) using the exact conversion factor (1 atmosphere = 0.0146959488 ksi). See the formula, worked examples, conversion table, and common uses.
Atmospheres to KSI converter
Converter
Pressure Converter
Convert pascals, bars, PSI, atmospheres, mercury columns, water columns, and engineering pressure units.
Context values
Some unit families need one extra value for a physically accurate result.
Kips per square inch.
Result = input x 101325 / 6.89475729e+6.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Atmospheres to KSI
Atmosphere and KSI both show up on pressure gauges — psi is standard on US tire and tool specifications, while bar is the everyday pressure unit across most of the rest of the world. Atmosphere is most often used for chemistry (standard conditions are often defined at 1 atm).
Formula
ksi = atmospheres × 0.0146959487755
This factor comes from each unit's defined relationship to the category's base unit: 1 atmosphere equals 101325 base units, and 1 ksi equals 6894757.29317 base units, so dividing one by the other gives the direct atmosphere-to-ksi factor of 0.0146959487755.
Simple example
1 atm × 0.01469594878 = 0.0146959488 ksi
1 atmosphere = 0.0146959488 ksi.
Real-world example
35 atm × 0.01469594878 = 0.5143582071 ksi
35 atmospheres = 0.5143582071 ksi.
Conversion table
| Atmosphere (atm) | KSI (ksi) |
|---|---|
| 1 atm | 0.0146959488 ksi |
| 5 atm | 0.0734797439 ksi |
| 10 atm | 0.1469594878 ksi |
| 25 atm | 0.3673987194 ksi |
| 50 atm | 0.7347974388 ksi |
| 100 atm | 1.469594878 ksi |
Reverse conversion: KSI to Atmosphere
0.0146959488 ksi × 68.04596391 = 1.000000002 atm
0.0146959488 ksi = 1.000000002 atmospheres.
atmospheres = ksi × 68.0459639099
For a page dedicated to this direction, see KSI to Atmosphere.
Understanding the Atmosphere
Atmosphere (atm) measures pressure. Defined as exactly 101,325 pascals, originally based on the average atmospheric pressure at mean sea level. It is classified as a non-SI unit accepted for use with the SI.
Where it's used: Widely used internationally in chemistry, meteorology, and diving/aviation contexts alongside the pascal and bar
Uses of the Atmosphere today
- Chemistry (standard conditions are often defined at 1 atm)
- Diving and aviation pressure references
- General reference for everyday atmospheric pressure
Understanding the KSI (ksi)
Kips per square inch.
Atmosphere — sources
- BIPM SI Brochure — Standard atmosphere listed among non-SI units with a fixed exact value in pascals.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many ksi are in 1 atmosphere?
1 atmosphere equals 0.0146959488 ksi, using the exact defined conversion factor rather than an estimate.
How do I convert atmosphere to ksi?
Multiply the atmosphere value by 0.01469594878. The converter above does this instantly to whatever precision you set.
How do I convert ksi back to atmosphere?
Use the reverse factor: 1 ksi equals 68.04596391 atmospheres. You can also use the swap control in the converter above to flip the direction instantly.
What is a atmosphere?
Atmosphere (atm) measures pressure. Defined as exactly 101,325 pascals, originally based on the average atmospheric pressure at mean sea level. It is classified as a non-SI unit accepted for use with the SI.
What is a ksi?
KSI (ksi) is a unit of pressure.
Is the atmosphere to ksi conversion exact?
Yes. Defined as exactly 101,325 pascals, originally based on the average atmospheric pressure at mean sea level. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the atmosphere still used today?
Widely used internationally in chemistry, meteorology, and diving/aviation contexts alongside the pascal and bar