A Free easy to use calculator For an avid mother and a busy obstetrician to know the important dates and duration of your pregnancy (POG plus EDD), Time in weeks and days of your pregnancy.From only one date entry we also calculate your expected date of delivery (EDD), which is also calculated by an obstetrician in your first ante-natal visit. This Obs calculator is very usefull to obstettrician who don't want to calculate Expected Date of Dilevery (EDD), and Period of Gestation (POG) manually and wants or needs a simple tool which only requires one entry. It uses Parikh's formula for Asian countries accurate to Standard Deviation 13days), and Naegli's formulae for the western countries EDD (Standard devaition 13days). Primigravida's (First time mothers) are within Plus minus 7-9days of EDD. it is helpful to consider gestation time as a range of dates rather than as a single "due date". For instance, a standard deviation of 13 days means that 90% of babies will be born within two weeks of their EDD, and 21% will be born within three days of it. Only 4% of births will occur on the EDD. Refrences: (1). Bergsjø P, Denman DW 3rd, Hoffman HJ, Meirik O. (1990). "Duration of human singleton pregnancy. A population-based study.". Acta Obstet Gynecol Scand: 197–207. (2). Gray, H (1962). "Duration of pregnancy.". Stanford Medical Bulletin 20: 24–8. PMID 13901307. (3).Dr H. Kieler, O. Axelsson, S. Nilsson, U. Waldenströ (1995). "The length of human pregnancy as calculated by ultrasonographic measurement of the fetal biparietal diameter". Ultrasound in Obstetrics & Gynecology 6 (5): 353–357. doi:10.1046/j.1469-0705.1995.06050353.x. PMID 8590208.
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