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Ovulation date calculator

Ovulation date calculator | ovulation chart | work out your ovulation days

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 date calculator.

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

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

Step 1

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.

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

Your cycle length is 33.

Step 2

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

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

Step 3

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

Where next?
- 10 things you need to know about ovulation
- Recognising when you're most fertile
- Eat to get pregnant
- Facts about infertility
- Are you pregnant? Find out what symptoms to look for
- Are fertility home testing kits worth the money? Find out the facts

By Vicky Woollaston

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4 days

lauren

I chose to have an abortion around 3 months ago, relationship was difficult and i thought it was for the best but i have come to realise that i want a baby more than anything.....i am wondering if you could give me advice on tips to get pregnant....??i am worried also about infertility after my terminantion. thanks

14 days

Michelle

hiyaa a jus found out about 3 weeks ago i am now about 10 weeks pregantan am so woried i hope my baby is healthy and normal. i want a boy and have a few names in mind me and my boyfreind are so happy we are so exited. i cant wait for my scan so that i can have some idia to weather my baby is in perfect health. good look to all uss pregnant wimon out there ayeee!!!! xxxxxxx

27 days

clare

i had an abortion about a year ago and have been trying ever since and nothing has been happening...i got pregnant first time last year, but as i was going thew a divorce it was unsuitable...do you think that abortion may of damaged me or anything?

about 1 month

sal

good

3 months

amy pines

i keep ovulating on diffrent days each month

3 months

Judith

Hi Natalie,
l have just conceived after 5 months of trying the only thing i did different this month was start taking Agnus Castus tablets from the health shop coincidence maybe all my previous pregnancies like yourself happened first try round but i have been struggling with this one til now(touch wood) hubby says don't forget afternoon delight aswell.Also been taking the folic acid vitamin tablets in readiness all along.Good luck anyway

3 months

natalie

i have 2 children from a previous relationship, and i fell pregnant on the first try with both of them! however my new partner and i have been trying to get pregnant now for over 5 months and still nothing? any body have any ideas? I am desperate and will try anything!

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