A Period calculator Leave a Comment / Uncategorized / By bhushankumar8871@gmail.com Period Calculator Period Calculator First Day of Your Last Period: JanFebMarApr MayJunJulAug SepOctNovDec How long did it last? 3 days 4 days 5 days 6 days 7 days Average Length of Cycles: 26 days 27 days 28 days 29 days 30 days Calculate