Atmospheres to torr
One atmosphere is 760 torr, and this shows the working rather than just the answer. Nothing you type here leaves your browser — it is worked out on your own device, so there is nothing to send and nothing to log.
The factor
One atmosphere is 760 torr. That is the whole of the conversion: multiply by it, and nothing else happens.
And it is exact
Not rounded, not measured, not a convention that might be revised. The factor above is the definition, so an answer from it is as exact as the number you typed.
The atmosphere is defined as exactly 101,325 pascals. Not quite a bar.
The torr is exactly one 760th of an atmosphere.
There is no shorter version
The factor is short enough to use as it stands, so nobody carries a rounded one and there is nothing to get wrong.
Going the other way
The reverse is not this sum backwards in your head. It is a different factor, 0.001315789474, and dividing by one is not the same as multiplying by a rounded version of the other.
Rounded, the way back is 0.00132, which is high by 0.32%. So the two roundings do not cancel: go out and back with both and you do not land where you started.
How many of those decimals mean anything
The box above will give you ten decimal places because it can. Whether they mean anything is decided by your measurement, not by the arithmetic.
If you measured to the nearest atmosphere, your figure is already uncertain by half of one — so the answer is uncertain by about 380 torr, and every digit past that is decoration. Quoting 938.2656 when you measured with a tape is claiming a precision the tape never had.
Where these two sit
Atmospheres and torr both measure pressure, which is why they can be converted at all. A conversion between families — a length into a weight — is not a conversion, it is a question with a missing quantity in it.
The unit converter pairs atmospheres with bars rather than with torr, because that is the conversion people ask for most. This page exists because a good many ask for this one instead.
Other conversions from atmospheres
pascals · bars · kilopascals · mmHg · psi · millibars · inHg · hectopascals