Kips per square inch.
KSI to Atmospheres Converter — ksi to atm
Convert KSI (ksi) to Atmosphere (atm) using the exact conversion factor (1 ksi = 68.04596391 atmosphere). See the formula, worked examples, conversion table, and common uses.
KSI to Atmospheres 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.
A standard atmosphere is exactly 101,325 pascals.
Result = input x 6.89475729e+6 / 101325.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting KSI to Atmospheres
KSI and Atmosphere 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. Specifically: Kips per square inch, and a standard atmosphere is exactly 101,325 pascals.
Formula
atmospheres = ksi × 68.0459639099
This factor comes from each unit's defined relationship to the category's base unit: 1 ksi equals 6894757.29317 base units, and 1 atmosphere equals 101325 base units, so dividing one by the other gives the direct ksi-to-atmosphere factor of 68.0459639099.
Simple example
1 ksi × 68.04596391 = 68.04596391 atm
1 ksi = 68.04596391 atmospheres.
Real-world example
35 ksi × 68.04596391 = 2,381.608737 atm
35 ksi = 2,381.608737 atmospheres.
Conversion table
| KSI (ksi) | Atmosphere (atm) |
|---|---|
| 1 ksi | 68.04596391 atm |
| 5 ksi | 340.2298195 atm |
| 10 ksi | 680.4596391 atm |
| 25 ksi | 1,701.149098 atm |
| 50 ksi | 3,402.298195 atm |
| 100 ksi | 6,804.596391 atm |
Reverse conversion: Atmosphere to KSI
68.04596391 atm × 0.01469594878 = 1 ksi
68.04596391 atmospheres = 1 ksi.
ksi = atmospheres × 0.0146959487755
For a page dedicated to this direction, see Atmosphere to KSI.
Understanding the KSI (ksi)
Kips per square inch.
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
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 atmospheres are in 1 ksi?
1 ksi equals 68.04596391 atmospheres, using the exact defined conversion factor rather than an estimate.
How do I convert ksi to atmosphere?
Multiply the ksi value by 68.04596391. The converter above does this instantly to whatever precision you set.
How do I convert atmosphere back to ksi?
Use the reverse factor: 1 atmosphere equals 0.0146959488 ksi. You can also use the swap control in the converter above to flip the direction instantly.
What is a ksi?
KSI (ksi) is a unit of pressure.
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.
Is the ksi to atmosphere 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.