Re: How to calculate Kaza Umree?
^Well said brother Psyah.
It is always better to over estimate because for each extra "fard" namaz you would be rewarded sawab of 70 "nawafil".
I read it somewhere that when on the day of judgement any persons "fard" namaz are missing, and he has too many nafil namaz, than all his "nawafil" would be converted to "fard" namaz by dividing his "nawafil" with 70, as;
1 "fard" = 70 "nawafil".