One bar is exactly 750,061.6827 millitorr, so converting bar 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 thousandth of a torr, the working unit of vacuum deposition. Almost exactly atmospheric pressure; standard in European industry and diving.
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 millitorr, which is usually more useful than the bare number.
The formula
bar- The amount you are converting, in bar
750,061.682704- The exact number of millitorr in one bar
millitorr- The converted result
How it works, step by step
- Enter the value in bar.
- It is multiplied by 750,061.682704, 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
Sea-level air: 1.01 bar in millitorr
Take sea-level air, roughly 1.01 bar. The conversion is a single multiplication — 1.01 × 750,062 — giving 757,562 mTorr. Because the relationship is proportional, doubling the input doubles the answer to 1.51512e+06 mTorr.
A domestic water main: 4 bar in millitorr
Take a domestic water main, roughly 4 bar. The conversion is a single multiplication — 4 × 750,062 — giving 3.00025e+06 mTorr. Because the relationship is proportional, doubling the input doubles the answer to 6.00049e+06 mTorr.
How to read your score
Frequently asked questions
How many millitorr are in one bar?
Exactly 750,061.682704. 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 millitorr?
millitorr = bar × 750,061.682704. Reversed, bar = millitorr ÷ 750,061.682704, which is the same as multiplying by 1.33322368421e-06.
Which is the bigger unit, the bar or the millitorr?
The bar. One bar equals 750,062 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 bar?
Almost exactly atmospheric pressure; standard in European industry and diving.
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 bar to mTorr in my head?
Plenty of people do this in their head: multiply by 750,000 instead of using the exact factor 750,061.6827. At 100 that shortcut gives 75,000,000 millitorr, off by 6168 millitorr or about 0.01%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Bar to millitorr reference tables
| Bar | Millitorr |
|---|---|
| 0.5 bar | 375,031 mTorr |
| 1 bar | 750,062 mTorr |
| 2 bar | 1.50012e+06 mTorr |
| 3 bar | 2.25019e+06 mTorr |
| 5 bar | 3.75031e+06 mTorr |
| 10 bar | 7.50062e+06 mTorr |
| 20 bar | 1.50012e+07 mTorr |
| 25 bar | 1.87515e+07 mTorr |
| 50 bar | 3.75031e+07 mTorr |
| 75 bar | 5.62546e+07 mTorr |
| 100 bar | 7.50062e+07 mTorr |
| 250 bar | 1.87515e+08 mTorr |
| 500 bar | 3.75031e+08 mTorr |
| 1000 bar | 7.50062e+08 mTorr |
| 5000 bar | 3.75031e+09 mTorr |
Exact factor: 1 bar = 750,061.682704 millitorr.
| Quantity | bar | mTorr |
|---|---|---|
| Sea-level air | 1.013 bar | 7.6e+05 mTorr |
| A car tyre | 2.206 bar | 1.655e+06 mTorr |
| Blood pressure, systolic | 0.16 bar | 1.2e+05 mTorr |
| A bicycle tyre | 6.205 bar | 4.654e+06 mTorr |
| A domestic water main | 4 bar | 3e+06 mTorr |
| A steam boiler | 10 bar | 7.501e+06 mTorr |
Published reference values, converted with the same factor this page uses.