Use our free ovulation calculator to find out when you are ovulating and when your most fertile days are, to help you successfully conceive a baby. Displayed in calendar view. Please follow the instructions right below to calculate your ovulation days:

STEP 1
Select the First Day of your Last Period:


STEP 2
Length of your cycle: days

calculate

Your next ovulation: 20th of July


ovulation
menstruating

Ovulation, fertility and period calculator



Use our sophisticated ovulation calculator to find out when your most fertile days are and when are you the most likely conceive, based on your menstrual cycle. Simply add the first day of your last period, and let us know the length of your menstrual cycle (it's usually 28 days), and our fertility calculator will show you exactly when are you the most likely to get pregnant.


Your ovulation explained

Your details:
  • Your next ovulation day: 15th of July

  • First day of your last period: 1st of July
  • Your next period: 1st of July
  • Length of your cycle: 28 days
  • You should have sex between the 11th of July  and 15th of July to conceive a baby.
Now let's take a look at your menstrual cycle and see how we've calculated your ovulation days. You told us that the first day of your last period was on the 1st of July. Now we'll have to calculate when your next period will happen, and then extract 14 days from that date, to find out your next ovulation. Here is how we calculated your ovulation days:
  • You told us that the first day of your last period was on the 1st of July.
  • You also told us that the length of your menstrual cycle is 28 days.
  • To find out your next period, we add your menstrual cycle length (28 days) to your last period date (1st of July) - 28 days after the 1st of July is 29th of July.
  • Now that we know your next period date, all we have to do is to extract 14 days from that date, to find out your next ovulation date:
  • 29th of July minus 14 days will be exactly the 15th of July - this is your next ovulation date, more precisely, this is the day when you'll release an egg, ready to be fertilised
  • In order to conceive a baby, it is advised to have sex 5 days before your ovulation date, every day, until your ovulation day - from the 11th of July until the 15th of July.
 

 

How women's ovulation date is calculated

This is a break-down of how your ovulation is calculated, and how we work out your most fertile days, based on your menstrual cycle.

When do women ovulate

Your ovulation occurs 14 days before your next period. Please note: this is not 14 days after your last period, but 14 days BEFORE your next period. This is a fairly common misconception, and the fact that most periodic cycles are of 28 days in length, makes many women assume that their ovulation is 14 days after the last period. Obviously, when your cycle length is 28 days, it is actually 14 days after your next period as well (as it's exactly 14 days before the next one), but what happens if your menstrual cycle is 30 days, for example? Well, in this case, you will ovulate 16 days after your last period (which is 14 days before your next one).

OVULATION FACTS

  • Ovulation occurs 14 days before your next period
  • Most periodic cycles are 28 days in length
  • Once the egg is released during ovulation, it will live up to 12 hours, waiting to be fertilised
  • Sperm can survive up to 5 days in the vaginal tract
  • Therefore, you are likely to conceive even if you have sex 5 days before your ovulation day

     


Frequently Asked Questions on Ovulation

What is ovulation?

Ovulation is the time of the month when an egg is released from the woman's ovaries into the fallopian tube, where it can be fertilised by a sperm cell if intercourse happens.

When should I have intercourse to conceive a baby?

Intercourse should happen a few days before the ovulation is estimated to happen, and on the ovulation day. Sperm cells can live in the vaginal tract for days, and this continuous intercourse ensures that the egg is more likely to be fertilised when it's released.

When exactly does my ovulation occur?

Your ovulation occurs exactly 14 days BEFORE your next period. This is contrary to the belief that it occurs 14 days AFTER your last period, a most menstrual cycles are not 28 days in length.

How do I calculate my ovulation days?

You'll need to add the length of your cycle (usually 28 days) to your last period date, then subtract 14 days from that, in order to evaluate when your next ovulation day occurs. You can use our ovulation calculator do do that in seconds.


How ovulation happens - video explanation

See below an easy to understand animated video on how the ovulation takes place each month.




How fertilisation happens - video explanation

This is probably the best, animated explanation on how the fertilisation happens in the woman's body, with detailed information on the whole journey of the sperm, up to the conception.



When Does Ovulation Start After Giving Birth?

Short Answer: It varies greatly, but it can be possible to ovulate just 3 weeks after giving birth.

How Does The LH Surge Affect Ovulation?

Short Answer: The LH surge actually triggers ovulation.
Luteinising Hormone (LH) is

When Can you Ovulate After A Miscarriage?

Short Answer: It varies, but it can be as soon as 2 weeks after loss of pregnancy.
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