This page converts atmospheres into kilopounds per square inch using the factor 0.01469594878, and shows the reverse figure alongside it. Both units measure pressure, which is why one number does the whole job.
Standard atmospheric pressure by definition — 101,325 pascals exactly. One thousand psi; the unit US steel and alloy strengths are quoted in.
Gauge versus absolute. A tyre gauge reading 32 psi means 32 psi above atmospheric, which is about 46.7 psi absolute. Converting the number is straightforward; remembering which zero it was measured from is where the mistakes happen. N/mm² and MPa are the same size, so a drawing quoting either is quoting the same stress. Two tables follow: rounded steps for quick lookup, and a set of real reference quantities converted into kilopounds per square inch, which is usually more useful than the bare number.
The formula
atmospheres- The amount you are converting, in atmospheres
0.0146959487755- The exact number of kilopounds per square inch in one atmosphere
kilopounds per square inch- The converted result
How it works, step by step
- Enter the value in atmospheres.
- It is multiplied by 0.0146959487755, the exact factor between the two units.
- The answer is shown in kilopounds per square inch, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
Sea-level air: 1 atm in kilopounds per square inch
Sea-level air comes to about 1 atm. Multiplying by the factor: 1 × 0.0146959 = 0.0146959 ksi. Dividing the answer back by 0.0146959 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
A bicycle tyre: 6.12 atm in kilopounds per square inch
At 6.12 atm (a bicycle tyre), the same quantity in kilopounds per square inch is 6.12 × 0.0146959 = 0.0899392 ksi. One atmosphere is 0.0146959 kilopounds per square inch, so the numbers shrink as expected.
How to read your score
Frequently asked questions
How many kilopounds per square inch are in one atmosphere?
Exactly 0.0146959487755. Every figure on this page is that one number multiplied by your input, so the only rounding is at the display step.
What is the formula to convert atmospheres to kilopounds per square inch?
kilopounds per square inch = atmospheres × 0.0146959487755. Reversed, atmospheres = kilopounds per square inch ÷ 0.0146959487755, which is the same as multiplying by 68.0459639099.
Which is the bigger unit, the atmosphere or the kilopound per square inch?
The kilopound per square inch. One atmosphere is only 0.0146959 of a kilopound per square inch, so it takes 68.046 atmospheres to make one kilopound per square inch.
What does this quantity actually measure?
Both units measure pressure. That is why a single factor is enough: there is no temperature offset and no material property involved, unlike conversions that cross between different quantities.
What is a atmosphere?
Standard atmospheric pressure by definition — 101,325 pascals exactly.
What is a kilopound per square inch?
One thousand psi; the unit US steel and alloy strengths are quoted in.
Why does my answer differ from another converter?
Almost always because the other tool rounded the factor before multiplying. This page keeps full double precision through the calculation and rounds only for display, and it prints the factor it used so you can see where any difference came from.
Is there a quick way to do atm to ksi in my head?
Plenty of people do this in their head: divide by 70 instead of using the exact factor 0.01469594878. At 100 that shortcut gives 1.4285714 kilopounds per square inch, off by 0.04102 kilopounds per square inch or about 2.79%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Atmospheres to kilopounds per square inch reference tables
| Atmospheres | Kilopounds Per Square Inch |
|---|---|
| 0.5 atm | 0.00734797 ksi |
| 1 atm | 0.0146959 ksi |
| 2 atm | 0.0293919 ksi |
| 3 atm | 0.0440878 ksi |
| 5 atm | 0.0734797 ksi |
| 10 atm | 0.146959 ksi |
| 20 atm | 0.293919 ksi |
| 25 atm | 0.367399 ksi |
| 50 atm | 0.734797 ksi |
| 75 atm | 1.1022 ksi |
| 100 atm | 1.46959 ksi |
| 250 atm | 3.67399 ksi |
| 500 atm | 7.34797 ksi |
| 1000 atm | 14.6959 ksi |
| 5000 atm | 73.4797 ksi |
Exact factor: 1 atmosphere = 0.0146959487755 kilopounds per square inch.
| Quantity | atm | ksi |
|---|---|---|
| Sea-level air | 1 atm | 0.0147 ksi |
| A car tyre | 2.177 atm | 0.032 ksi |
| Blood pressure, systolic | 0.1579 atm | 0.00232 ksi |
| A bicycle tyre | 6.124 atm | 0.09 ksi |
| A domestic water main | 3.948 atm | 0.05802 ksi |
| A steam boiler | 9.869 atm | 0.145 ksi |
Published reference values, converted with the same factor this page uses.