One kilopound per square inch is exactly 51,714,932.57 millitorr, so converting kilopounds per square inch to millitorr is a single multiplication. Enter any figure and the result appears as you type — the arithmetic runs in your browser, so nothing is sent anywhere.
One thousand psi; the unit US steel and alloy strengths are quoted in. One thousandth of a torr, the working unit of vacuum deposition.
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. Below the calculator there is a step table for the values people look up most, and a second table putting real pressure figures into millitorr so the number you get has something to be compared against.
The formula
kilopounds per square inch- The amount you are converting, in kilopounds per square inch
51,714,932.5715- The exact number of millitorr in one kilopound per square inch
millitorr- The converted result
How it works, step by step
- Enter the value in kilopounds per square inch.
- It is multiplied by 51,714,932.5715, the exact factor between the two units.
- The answer is shown in millitorr, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
A bicycle tyre: 0.09 ksi in millitorr
A bicycle tyre comes to about 0.09 ksi. Multiplying by the factor: 0.09 × 5.17149e+07 = 4.65434e+06 mTorr. Dividing the answer back by 5.17149e+07 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
A steam boiler: 0.145 ksi in millitorr
At 0.145 ksi (a steam boiler), the same quantity in millitorr is 0.145 × 5.17149e+07 = 7.49867e+06 mTorr. One kilopound per square inch is 5.17149e+07 millitorr, so the numbers grow as expected.
How to read your score
Frequently asked questions
How many millitorr are in one kilopound per square inch?
Exactly 51,714,932.5715. 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 kilopounds per square inch to millitorr?
millitorr = kilopounds per square inch × 51,714,932.5715. Reversed, kilopounds per square inch = millitorr ÷ 51,714,932.5715, which is the same as multiplying by 1.93367747046e-08.
Which is the bigger unit, the kilopound per square inch or the millitorr?
The kilopound per square inch. One kilopound per square inch equals 5.17149e+07 millitorr.
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 kilopound per square inch?
One thousand psi; the unit US steel and alloy strengths are quoted in.
What is a millitorr?
One thousandth of a torr, the working unit of vacuum deposition.
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 ksi to mTorr in my head?
Plenty of people do this in their head: multiply by 50000000.000000 instead of using the exact factor 51,714,932.57. At 100 that shortcut gives 5000000000.000000 millitorr, off by 171493257.150437 millitorr or about 3.32%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Kilopounds Per Square Inch to millitorr reference tables
| Kilopounds Per Square Inch | Millitorr |
|---|---|
| 0.5 ksi | 2.58575e+07 mTorr |
| 1 ksi | 5.17149e+07 mTorr |
| 2 ksi | 1.0343e+08 mTorr |
| 3 ksi | 1.55145e+08 mTorr |
| 5 ksi | 2.58575e+08 mTorr |
| 10 ksi | 5.17149e+08 mTorr |
| 20 ksi | 1.0343e+09 mTorr |
| 25 ksi | 1.29287e+09 mTorr |
| 50 ksi | 2.58575e+09 mTorr |
| 75 ksi | 3.87862e+09 mTorr |
| 100 ksi | 5.17149e+09 mTorr |
| 250 ksi | 1.29287e+10 mTorr |
| 500 ksi | 2.58575e+10 mTorr |
| 1000 ksi | 5.17149e+10 mTorr |
| 5000 ksi | 2.58575e+11 mTorr |
Exact factor: 1 kilopound per square inch = 51,714,932.5715 millitorr.
| Quantity | ksi | mTorr |
|---|---|---|
| Sea-level air | 0.0147 ksi | 7.6e+05 mTorr |
| A car tyre | 0.032 ksi | 1.655e+06 mTorr |
| Blood pressure, systolic | 0.00232 ksi | 1.2e+05 mTorr |
| A bicycle tyre | 0.09 ksi | 4.654e+06 mTorr |
| A domestic water main | 0.05802 ksi | 3e+06 mTorr |
| A steam boiler | 0.145 ksi | 7.501e+06 mTorr |
Published reference values, converted with the same factor this page uses.