To convert millitorr to bar, multiply by 1.333223684e-06. That factor is the whole relationship: both units measure pressure, so the conversion is a proportion with no offset and no substance-specific constant.
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. Below the calculator there is a step table for the values people look up most, and a second table putting real pressure figures into bar so the number you get has something to be compared against.
The formula
millitorr- The amount you are converting, in millitorr
1.33322368421e-06- The exact number of bar in one millitorr
bar- The converted result
How it works, step by step
- Enter the value in millitorr.
- It is multiplied by 1.33322368421e-06, the exact factor between the two units.
- The answer is shown in bar, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
A bicycle tyre: 4.65e+06 mTorr in bar
A bicycle tyre comes to about 4.65e+06 mTorr. Multiplying by the factor: 4.65e+06 × 1.33322e-06 = 6.19949 bar. Dividing the answer back by 1.33322e-06 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
Blood pressure, systolic: 1.2e+05 mTorr in bar
Blood pressure, systolic comes to about 1.2e+05 mTorr. Multiplying by the factor: 1.2e+05 × 1.33322e-06 = 0.159987 bar. Dividing the answer back by 1.33322e-06 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
How to read your score
Frequently asked questions
How many bar are in one millitorr?
Exactly 1.33322368421e-06. 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 millitorr to bar?
bar = millitorr × 1.33322368421e-06. Reversed, millitorr = bar ÷ 1.33322368421e-06, which is the same as multiplying by 750,061.682704.
Which is the bigger unit, the millitorr or the bar?
The bar. One millitorr is only 1.33322e-06 of a bar, so it takes 750,062 millitorr to make one bar.
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 millitorr?
One thousandth of a torr, the working unit of vacuum deposition.
What is a bar?
Almost exactly atmospheric pressure; standard in European industry and diving.
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 mTorr to bar in my head?
Plenty of people do this in their head: divide by 750,000 instead of using the exact factor 0.000001. At 100 that shortcut gives 0.00013333333 bar, off by 1.0965e-08 bar or about 0.01%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Millitorr to bar reference tables
| Millitorr | Bar |
|---|---|
| 0.5 mTorr | 6.66612e-07 bar |
| 1 mTorr | 1.33322e-06 bar |
| 2 mTorr | 2.66645e-06 bar |
| 3 mTorr | 3.99967e-06 bar |
| 5 mTorr | 6.66612e-06 bar |
| 10 mTorr | 1.33322e-05 bar |
| 20 mTorr | 2.66645e-05 bar |
| 25 mTorr | 3.33306e-05 bar |
| 50 mTorr | 6.66612e-05 bar |
| 75 mTorr | 9.99918e-05 bar |
| 100 mTorr | 0.000133322 bar |
| 250 mTorr | 0.000333306 bar |
| 500 mTorr | 0.000666612 bar |
| 1000 mTorr | 0.00133322 bar |
| 5000 mTorr | 0.00666612 bar |
Exact factor: 1 millitorr = 1.33322368421e-06 bar.
| Quantity | mTorr | bar |
|---|---|---|
| Sea-level air | 7.6e+05 mTorr | 1.013 bar |
| A car tyre | 1.655e+06 mTorr | 2.206 bar |
| Blood pressure, systolic | 1.2e+05 mTorr | 0.16 bar |
| A bicycle tyre | 4.654e+06 mTorr | 6.205 bar |
| A domestic water main | 3e+06 mTorr | 4 bar |
| A steam boiler | 7.501e+06 mTorr | 10 bar |
Published reference values, converted with the same factor this page uses.