How does the ovulation calculator work?

The ovulation calculator uses the date of your last period and your average cycle length to estimate your fertile window — the days when you're most likely to conceive. Ovulation usually happens about 14 days before your next period. By predicting this window, the tool helps you time sex or insemination for the best chance of success.

Irregular periods can make it harder to predict ovulation with a calculator alone. If your cycles vary significantly from month to month, consider:

• Using ovulation predictor kits (which detect hormone surges in urine)

• Tracking cervical mucus changes (it becomes clearer and stretchier around ovulation)

• Monitoring basal body temperature (a slight increase signals ovulation has occurred)

If you're concerned about irregular periods, speak to your GP.

Signs you may be ovulating include:

• A change in vaginal discharge — becoming clearer, slippery, and stretchy

• Mild pelvic or abdominal pain

• A slight rise in basal body temperature

• Increased sex drive or heightened senses (such as smell or taste)

Using a combination of these signs alongside a calculator or ovulation test can improve accuracy.

Improving your general health can support fertility. You can try:

• Maintaining a healthy weight – being under-or overweight can affect ovulation

• Taking folic acid before conception

• Avoiding smoking, excess alcohol and caffeine

• Managing stress, which can impact hormone balance

If you've been trying to conceive for over a year (or six months if over 35), consider seeking medical advice.