A lot of variables in it. With a full load of passengers FAO and DBV (which is a smidge further) are about it.
If the temperature is 0 or thereabouts you could take off at 49 tonnes (Flybe max) and you could get about 8 tonnes of fuel on but any hotter than that then you obviously lose some lifting ability.
IIRC FAO needed 6 tonnes ish and during the summer we would often be scratching around for an extra couple of hundred kilos and quite often left with minimum fuel.