This page converts bar into kilopounds per square inch using the factor 0.01450377377, and shows the reverse figure alongside it. Both units measure pressure, which is why one number does the whole job.
Almost exactly atmospheric pressure; standard in European industry and diving. 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. The tables underneath give both a plain step-by-step lookup and a list of real quantities expressed in kilopounds per square inch, so you can sanity-check whether your answer is a plausible size.
The formula
bar- The amount you are converting, in bar
0.014503773773- The exact number of kilopounds per square inch in one bar
kilopounds per square inch- The converted result
How it works, step by step
- Enter the value in bar.
- It is multiplied by 0.014503773773, 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
A car tyre: 2.21 bar in kilopounds per square inch
A car tyre comes to about 2.21 bar. Multiplying by the factor: 2.21 × 0.0145038 = 0.0320533 ksi. Dividing the answer back by 0.0145038 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
Blood pressure, systolic: 0.16 bar in kilopounds per square inch
Take blood pressure, systolic, roughly 0.16 bar. The conversion is a single multiplication — 0.16 × 0.0145038 — giving 0.0023206 ksi. Because the relationship is proportional, doubling the input doubles the answer to 0.00464121 ksi.
How to read your score
Frequently asked questions
How many kilopounds per square inch are in one bar?
Exactly 0.014503773773. 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 bar to kilopounds per square inch?
kilopounds per square inch = bar × 0.014503773773. Reversed, bar = kilopounds per square inch ÷ 0.014503773773, which is the same as multiplying by 68.9475729317.
Which is the bigger unit, the bar or the kilopound per square inch?
The kilopound per square inch. One bar is only 0.0145038 of a kilopound per square inch, so it takes 68.9476 bar 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 bar?
Almost exactly atmospheric pressure; standard in European industry and diving.
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 bar to ksi in my head?
Plenty of people do this in their head: divide by 70 instead of using the exact factor 0.01450377377. At 100 that shortcut gives 1.4285714 kilopounds per square inch, off by 0.02181 kilopounds per square inch or about 1.50%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Bar to kilopounds per square inch reference tables
| Bar | Kilopounds Per Square Inch |
|---|---|
| 0.5 bar | 0.00725189 ksi |
| 1 bar | 0.0145038 ksi |
| 2 bar | 0.0290075 ksi |
| 3 bar | 0.0435113 ksi |
| 5 bar | 0.0725189 ksi |
| 10 bar | 0.145038 ksi |
| 20 bar | 0.290075 ksi |
| 25 bar | 0.362594 ksi |
| 50 bar | 0.725189 ksi |
| 75 bar | 1.08778 ksi |
| 100 bar | 1.45038 ksi |
| 250 bar | 3.62594 ksi |
| 500 bar | 7.25189 ksi |
| 1000 bar | 14.5038 ksi |
| 5000 bar | 72.5189 ksi |
Exact factor: 1 bar = 0.014503773773 kilopounds per square inch.
| Quantity | bar | ksi |
|---|---|---|
| Sea-level air | 1.013 bar | 0.0147 ksi |
| A car tyre | 2.206 bar | 0.032 ksi |
| Blood pressure, systolic | 0.16 bar | 0.00232 ksi |
| A bicycle tyre | 6.205 bar | 0.09 ksi |
| A domestic water main | 4 bar | 0.05802 ksi |
| A steam boiler | 10 bar | 0.145 ksi |
Published reference values, converted with the same factor this page uses.