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Ovulation calculator

Use our handy tool to work out when you are most likely to ovulate

The maths behind your ovulation

Are you trying for a baby? Getting pregnant isn't always as straightforward as it sounds, so increase your chances by using our ovulation calculator to find out when you are most fertile.

How does the ovulation calculator work?

You’re most likely to get pregnant within a day or so of ovulation. This usually happens around the 14th day after your last period however everyone is a little different so this is where our calculator comes in handy. By inputting your own personal dates it is able to do the math for you and work out when you are most likely to ovulate.

Simply select the first day of your last menstrual period. Then, tell us:

1. The average length of your cycle

2. The average length of your ‘luteal phase.' This means the part of your cycle which starts at ovulation and ends the day before your next period. If you are unsure, just leave it as 14 days.

The ovulation calculator will then tell you which days you're at your most fertile, including the date ’most likely’ for you to conceive.


Is the ovulation calculator accurate?

Please bear in mind that these are just estimates, based on a regular menstrual cycle. If your cycle is irregular the ovulation calculator may not be the most accurate way to work out when you are ovulating.

Now you know your most fertile days what else can you do to improve your chances of getting pregnant?

1. Have lots of sex

Regular sex around your fertility window will ensure there’s always sperm in the fallopian tube ready to meet the egg when it’s released

2. Maintain a healthy diet

Being overweight or underweight can make periods irregular and affect your chances of conceiving so it’s important to maintain a healthy BMI. Drinking too much alcohol and smoking can also effect fertility for you & your partner, if you’re trying for a baby it’s advised that you cut down.

3. Don’t stress

Stress isn’t good for fertility. Take time out to relax and spend time doing something you enjoy, a hot bath or massage works a treat.

Read more on how to increase your chances of conception in our getting pregnant section.

Ovulation calculator