This page converts millibars into millitorr using the factor 750.0616827, and shows the reverse figure alongside it. Both units measure pressure, which is why one number does the whole job.
The meteorologist’s unit — sea-level pressure averages 1013.25 mbar. 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
millibars- The amount you are converting, in millibars
750.061682704- The exact number of millitorr in one millibar
millitorr- The converted result
How it works, step by step
- Enter the value in millibars.
- It is multiplied by 750.061682704, 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 domestic water main: 4000 mbar in millitorr
Take a domestic water main, roughly 4000 mbar. The conversion is a single multiplication — 4000 × 750.062 — giving 3.00025e+06 mTorr. Because the relationship is proportional, doubling the input doubles the answer to 6.00049e+06 mTorr.
A car tyre: 2210 mbar in millitorr
At 2210 mbar (a car tyre), the same quantity in millitorr is 2210 × 750.062 = 1.65764e+06 mTorr. One millibar is 750.062 millitorr, so the numbers grow as expected.
How to read your score
Frequently asked questions
How many millitorr are in one millibar?
Exactly 750.061682704. 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 millibars to millitorr?
millitorr = millibars × 750.061682704. Reversed, millibars = millitorr ÷ 750.061682704, which is the same as multiplying by 0.00133322368421.
Which is the bigger unit, the millibar or the millitorr?
The millibar. One millibar 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 millibar?
The meteorologist’s unit — sea-level pressure averages 1013.25 mbar.
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 mbar to mTorr in my head?
Plenty of people do this in their head: multiply by 750 instead of using the exact factor 750.0616827. At 100 that shortcut gives 75,000 millitorr, off by 6.168 millitorr or about 0.01%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Millibars to millitorr reference tables
| Millibars | Millitorr |
|---|---|
| 0.5 mbar | 375.031 mTorr |
| 1 mbar | 750.062 mTorr |
| 2 mbar | 1500.12 mTorr |
| 3 mbar | 2250.19 mTorr |
| 5 mbar | 3750.31 mTorr |
| 10 mbar | 7500.62 mTorr |
| 20 mbar | 15,001.2 mTorr |
| 25 mbar | 18,751.5 mTorr |
| 50 mbar | 37,503.1 mTorr |
| 75 mbar | 56,254.6 mTorr |
| 100 mbar | 75,006.2 mTorr |
| 250 mbar | 187,515 mTorr |
| 500 mbar | 375,031 mTorr |
| 1000 mbar | 750,062 mTorr |
| 5000 mbar | 3.75031e+06 mTorr |
Exact factor: 1 millibar = 750.061682704 millitorr.
| Quantity | mbar | mTorr |
|---|---|---|
| Sea-level air | 1013 mbar | 7.6e+05 mTorr |
| A car tyre | 2206 mbar | 1.655e+06 mTorr |
| Blood pressure, systolic | 160 mbar | 1.2e+05 mTorr |
| A bicycle tyre | 6205 mbar | 4.654e+06 mTorr |
| A domestic water main | 4000 mbar | 3e+06 mTorr |
| A steam boiler | 1e+04 mbar | 7.501e+06 mTorr |
Published reference values, converted with the same factor this page uses.