How accurate are the "Internet ovulation calculators"?

I guess they are based on scientific knowledge, and just work it out based on the lenght of your cycle and the most likely days you will ovulate. But nothing is 100% correct so if you have any doubt, use the ovulation sticks you can buy in the shops.
 
very accurate. I know exactly when i ovulated cause i had iui and i was figuring out when im due and they predicted ovulation date and it was correct. If you have regular cycles it can be pretty accurate
 
Charting is so much better than using some online ovulation predictor. Those things don't know your body - you do. Every woman's body is different, and the calculators don't take that into consideration. They can tell you based on a sampling of women when the AVERAGE ovulation occurs, but not yours exactly. We have been trying to conceive for 12 months now. Just for giggles, I used one a few times to see if it matched my actual ovulation date. It was always off by at least 2 days.The only way to pinpoint ovulation, and your most fertile time of the month, is to start charting and watching your fertility signs. Buy a basal thermometer and take your temp first thing every morning - at the same time every day - before you even get out of bed. Before you do anything at all. Note the temp. When you ovulate, your temp will rise and stay elevated above the pattern you note for pre-ovulation temps.Your cervical mucus will typically tell you when ovulation is coming. It will be watery, or like egg whites. That's the fertile stuff that keeps sperm alive while you are waiting to ovulate. This is also why you're fertile for a few days 'before' ovulation. The sperm can live for 3-5 days and lie in wait for the egg. Your egg will live for 12-24 hours after ovulation.You can also buy the ovulation strips to test for lueteinizing hormone (you'll have a surge of it 12-36 hours before ovulation), but keep in mind that when you test for ovulation the test line must be *as dark or darker than the control line. * Two lines do not equal a positive on the ovulation tests.Check out this site: http://www.fertilityfriend.comThere is a charting course there that you can take for free, and free software to chart your temps. The first day of your period is 'cycle day 1.' I typically ovulate on cycle day 12, but have actually ovulated on cycle day 10 before and as late as cycle day 15. This variation in ovulation days is why some women's cycle lengths vary. Once again, the time between ovulation and your period (the 'luteal' phase) will not vary more than a day, maybe two. But the time between your period and ovulation can vary more than that. Chart a few cycles and you'll see your own fertility pattern.Good luck!
 
They worked for me twice. They, of course, are not a 100% and they don't consider a hundred other factors that come with ovulating.
 
they're a calculated thing, however if ttc,, my suggestion is to have sex everyother day, because like periods,, ovulation can be irregular, so you may put all your energy into trying on your days, however your days may not be when you think they are!
 
They're not. I actually used the babycenter.com one at first. I finally started charting my temps because I wasn't getting pregnant. Turns out that the online calculator was off by a week! It's much better if you listen to your body (charting cervical mucus and temps) rather than some online calculator that is based on statistics. Good luck and lots of baby dust!!!
 
I used it to get pregnant with baby #1 i had him7-3-07baby #2 just caught me off gard.
 
Online ovulation calculators like http://www.livepregnancytest.com/ovulation are based on mathematical calculations. It is based on your period length and also your last period date. It's accurate for most people but everybody is different!
 
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