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If you're trying for a baby, knowing when you're ovulating can seem a bit confusing especially if your periods aren't regular. To stand your best chance of conceiving, you need to use an ovulation calculator.

An average woman's menstrual cycle is 28 days but cycles can range from 22 days right up to 36. Your menstrual cycle begins on the first day of your period and continues up to the day before you start your next one.

Use our free ovulation calculator to find out when you're ovulating over the next six months.

Work out your ovulation date:

Alternatively, follow these three steps to calculate your ovulation date and find out when you're likely to be most fertile.

Step 1: Your menstrual cycle

When your next period starts, make a note of the date. The following month, when your period comes again, make a note of this date, then count the days in between. This will give you your cycle length. You may need to do this for more than one month and take the average, especially if your cycle isn't regular. Remember also that coming off the Pill will reveal your true menstrual cycle.

Period starts = 1st January
Next period starts = 3rd February
Days in between (including 1st Jan but not 3rd Feb) = 33 days.

Your menstrual cycle length is 33.

Step 2: Your fertile dates

Using our ovulation calender, find the right number in the menstrual cycle length column (33 for the above example) and read across for your ovulation day and most fertile days.

Cycle lengthOvulationMost fertile
22Day 8Days 7-9
23Day 9Days 8-10
24Day 10Days 9-11
25Day 11Days 10-12
26Day 12Days 11-13
27Day 13Days 12-14
28Day 14Days 13-15
29Day 15Days 14-16
30Day 16Days 15-17
31Day 17Days 16-18
32Day 18Days 17-19
33Day 19Days 18-20
34Day 20Days 19-21
35Day 21Days 20-22
36Day 22Days 21-23

Step 3: Your ovulation date

Work out your ovulation and most fertile dates. For the above example:

First day of last period = 3rd February 2008
Cycle Length = 33
Ovulation (19 days later) = 22nd February 2008
Most fertile (18-20 days later) = 21st and 23rd February 2008

Once you know your ovulation date, as a rule, you are most fertile the day before, during and the day after. However, because sperm can survive for up to seven days in the right conditions you could be fertile before and after these days.

N.B These figures are based on averages and should be used as a guide only. Days and dates may differ from woman to woman.

- Print out and keep version

More on ovulation

- 10 things you need to know about ovulation

More on getting pregnant

- How to get pregnant?
- Eat to get pregnant
- Are you pregnant?

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Your comments


i just want to know that when i have to do sex with my husband before the monthly period starts or after the monthly period over.


Hello my good friends i want to say a big thanks and appreciation to the great man Dr ukpoyan of who bless my womb, i have been married for the past 10year without a child i have look for all kind of help that can make me get pregnant but nothing works, but through an insight i came across Dr ukpoyan profile at the internet when i was searching for help on how i can get a baby, Quickly i contacted him to help me out, he said he will cast a spell that will make me sleep with my partner and get pregnant so he told to have the faith and believe in him, as everything will be fine, and which i did, my friends after doing all the instructions given to me by Dr ukpoyan, a couple of weeks later i went for test and i was detected positively pregnant of 2weeeks and now i am here taking care of my baby girl all this i never believed will happen but with the help of Dr ukpoyan my problems where solved.. well if you need any help with your problem of delivery issue just log on to Dr ukpoyan on:


Hi me and my partner have been trying for a baby but my periods are irregular last period has started on 27th december 2013 and ended on 2nd feb 2014, then after that i got my periods on this month 15th march 2014 and its still on. So i can't keep a track on my cycle. How do i know when i'm ovulating in order to start trying again??

Mom of two

For a baby boy the best chance is to try on the ovulation day or a day before. If the cycle is 31 days, then I would try to calculate the day of ovulation as 14th day before my next period starts, or as in the table above, on the 17th day from the first day of my period.

Mom of two

If you had your period started on Jan 14th, it just says that your ovulation was aproximately about 14 days before, if you have 28 days cycle. However, it is impossible to predict when the next ovulation will happen. Perhaps it can happen in about 14th day after the period, but there is no way to know for sure since first comes the ovulation and then the period.

worried and wishing

I havent had my period since july 23 2013, and I just got it last night jan.14 2014. when would I ovulate?


the man is the one who can give a boy or girl chromosome.


hello, my period was on the 20th of nov n ended the 25. which my cycle from oct till nov was 35.I had sex 27 of nov and the 4 of dec. so would it b possible if i can get pregnant


can u plz reply fast


i am 29 years old we done sex before 13 days with precosions and my period date is 3-4 in month but after done sex i have not start this month period is it possible m i pragnet


If you had sex with your boyfriend around a week before your ex then it is probably your boyfriends. If you have a normal cycle of 28days then you would have been most fertile on around the 3rd to 5th of August. This is no guarantee though. Maybe you should consider if keeping this baby is the right thing to do as you are obviously not in a committed relationship and you sound quite young. Whatever your decision, make sure you have thought long and hard about it and considered your future.




Hi am 23 and have a three year old son. And have been trying for nearly three years for another we have had a lot of test done our last one being a scan of my ovaries and awaiting results so far everythings normal dos anyone know about other tests that can be done any help would be wecome thanks in advance


I am about 7 weeks pregnant and my last period was 21 July 13 I had sex with an ex on the 13th of August now am worried if the baby is his or my boyfriends can any one help


Hi I'm a newbee I had the mirena for 8yrs and had it removed in june trying to get preggo had sex like everyday or every other day for the last past mth`s please tell me what I'm doin wrong because I haven't had a positive test yet


this article is so useful . thanks.


Me and my partner are recently trying for a baby I came on my period 1st off arguest and I came off my period the Sunday what is the best date to try can anyone help me ???


hi my period dare is april 16-20th finish,now i am getting pregrant or not,checking the pregrancy correct time or not and period 12th day i missing


i had my last periods on 27th march and since then we are trying for a baby,,we made love on 6,12,14,16 of April... plesae tell me if iam pregnanat.


what chances do i have in twins since my father's sister has twins and my mother has twins ad

Kim 'muffin-tops' Williams

hey everyone, just wanted to let everyone know that ive jus bought some ovulation tests and they are really really good, i calculated wen i wud b ovulating and u start testing a few days before, i did the test a test on saturday when i was meant 2 b ovulating n it came back i wasnt, i did 1 on sunday and it came bak i wud b ovulating in the next 24 to 26 hrs! it tells u wen u r GOING to not wen u ARE! so i am meant to b ovulating today either this morning or by tonight!! the ovlation tests are quite expensive but soooooo worth it cos i mite not of known i was ovulating today if i hadnt bought them!! superdrug are doing buy 1 get 1 free so i wud recommend them sooo much!! im due on my next period on valentines day so either guna have a brill surprise or guna b disappointed, im trying soooooooooooo hard not 2 get obsessed but cant help it!! this is the 1st mnth of proper trying n will b so lucky if i get pregnant so quick!!! Anyway i really think u shud try th ovulation tests especially if u dont have regular periods!!! good luck everyone and wish me luck for getting pregnant :)

Kim 'muffin-tops' Williams

hey Girls, me and my husband have decided to try for a baby, i have worked out my ovulation date n shud b today but will have b able to work it out even beta next mnth afta my period! but i have jus bought the ovulation thing so wil b trying that out very soon!! i have a 7yr old from a previous relationship even tho my husband has bought her up since she was 6mnths old! we have tried b4 but no joy but i didnt really understand ovulation and stuff bak thn!!! i wish all of u look!! ALSO i wanted to say if u have questions why not try out a forum cos i dont think anyone is actually guna answer ur questions on here as much as a forum where u can write ur own topic n get more help ALSO dont get upset if u dont get pregnant afta a few mnths of trying cos it is goin 2 take longer thn 2 tries in most cases!! relax i no its hard cos i cant get babies off my mind atm!!! i just hope i do finally get pregnant!! good luck everyone x


i am 29,i find it difficult calculating my ovulation period cos i usually av irregular period,take for instance,i menstruated 9th of march nd menstruated 29th of april.pls wen is my next ovulatory period nd hw do i calculate it mostly for dis month.thanx.

sonia goyal

hello i am tring a baby boy.i got my period on 26th dec. my cycle length is 31 so please tell me on which date i can achive my goal having baby boy


am trying for a baby boy,i got my period on 27th of nov 2010 and i have 28days circle,iam on clomid 3-7 days,i made love on day 10,13,15,and 16 pls tell me if i can achieve my goal of having a baby boy

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