Hi,
Sorry no measurements I do not have a 1.4 petrol.
Why do you want to know? Guessing you are worried part of the end has broken off or it is the wrong dipstick.
If you Google 'a2oc dipstick' and then click images you will see several pictures of dipsticks showing measurement from threads, maybe one is applicable. The threads themselves are worth reading.
If in doubt I would buy a new one from Crewe Audi on here, not expensive, quoting your reg then you know it is guaranteed to be correct.
Andy