Pregnancy and periods
Work out due dates, cycles, fertile days and menopause symptoms, with NHS guidance and when to talk to your midwife or GP.
Featured calculator
Due date calculator
Your estimated due date from the first day of your last period, how far along you are and when the NHS usually offers each scan and appointment.
Work out my due dateTakes about a minute
Most used
Where most people start
The four pregnancy and periods calculators that get the most use.
Due date
Pregnancy week
Ovulation
PeriodSearch
Search pregnancy and periods
Only searches the 33 calculators in this topic.
Everything
All 33, sorted into shelves
Grouped by what you want to find out. Every one is in the new design.
Pregnancy
Due dates, weeks, appointments and after the birth.
13 calculators13 in the new design
- Due dateEstimated due date from the first day of your last period.Open
- ConceptionWhen conception probably happened.Open
- Pregnancy weight gainA typical gain for your week of pregnancy.Open
- PregnancyWeeks pregnant, trimester and what is next.Open
- Pregnancy caffeineToday's caffeine against the 200 mg limit.Open
- Pregnancy weekWhich week you are in, and of which trimester.Open
- Pregnancy milestoneScan, appointment and trimester dates.Open
- Pregnancy hydrationA daily drinks guide for pregnancy.Open
- Postpartum recovery timelineWhat usually happens in the weeks after birth.Open
- Postnatal walk plannerWalks that build up after the birth.Open
- Breastfeeding hydration guideA daily drinks guide while breastfeeding.Open
- Pregnancy exercise intensity checkerTalk test, effort and warning signs.Open
- Postpartum return to running plannerEarliest running date and checks after birth.Open
Periods and fertility
Cycles, ovulation and fertility appointments.
13 calculators13 in the new design
- PeriodYour next three periods, from your last one.Open
- OvulationYour likely ovulation day and fertile days.Open
- Cycle lengthAverage cycle and how much it varies.Open
- Fertile windowYour next three fertile windows.Open
- Perimenopause cycle trackerHow your cycle lengths are changing.Open
- Reusable period product savingsWhat reusables save against disposables.Open
- PMS preparation plannerYour likely PMS days, three months ahead.Open
- PCOS lifestyle goal plannerSmall activity goals for PCOS.Open
- Endometriosis pain diaryA summary of period pain for your GP.Open
- Fertility appointment countdownDays to your clinic visit, and the cycle day.Open
- IVF date plannerTransfer, test and due dates from egg collection.Open
- Egg freezing timeline plannerFrom first injection to egg collection.Open
- Strength training cycle plannerYour cycle phases with training notes.Open
Menopause
Symptoms, patterns and questions for your GP.
4 calculators4 in the new design
- Menopause age guideYour age against the usual menopause range.Open
- Menopause symptom trackerRate your symptoms and take a summary to the GP.Open
- Hot flush pattern trackerCount flushes by time of day and spot triggers.Open
- HRT appointment question builderYour own list of questions for the HRT appointment.Open
Strength, bones and more
Iron, bones, pelvic floor and training.
3 calculators3 in the new design
Good to know
Where the numbers come from
About these numbers
Guidance, not a diagnosis
Pregnancy is counted from the first day of your last period, so a full pregnancy is about 40 weeks. Cycles vary a lot from person to person, which is why every date here is an estimate.
Sources
Where we get them
- NHSHealth A to Z and the NHS BMI calculator
- NICE NG246Overweight and obesity guideline, 2025
- UK Chief Medical OfficersPhysical activity and alcohol guidelines
- SACNScientific Advisory Committee on Nutrition
Last checked 21 October 2026. Each calculator lists its own sources too.
Help
Support when you need it
Contact your midwife or GP any time you are worried, and call NHS 111 if you cannot reach them. If a date or a result brings up difficult feelings, Tommy's and the Miscarriage Association offer kind, free support.
Goals
Got a goal in mind?
Guided plans that walk you through the right calculators in the right order, with NHS guidance along the way.