About PregnancyCalculator.co.uk

We are a small, independent UK-based team who built this site because expectant parents deserve free, accurate, private pregnancy tools. We are not a medical organisation. We are not affiliated with the NHS.

We are parents and healthcare-aware individuals who believe information about pregnancy should be accessible, trustworthy and free. Your privacy matters to us: all calculations run locally in your browser, and your pregnancy data is never stored or shared.

Our free due date calculator uses Naegele's rule, the same method applied by NHS midwives, to estimate your estimated due date based on your last menstrual period, conception date, ultrasound scan result, or IVF transfer date. For couples trying to conceive, our ovulation calculator identifies your fertile window and peak ovulation day, and our guide on when to take a pregnancy test walks through the earliest reliable testing dates.

Once pregnancy is confirmed, our week-by-week development guide follows your baby from week 4 through to week 40, alongside our pregnancy weight gain tool and a kick counter for baby's movements. If you are employed in the UK, our maternity pay calculator estimates your SMP week by week.

Throughout pregnancy, we cover what foods to avoid in pregnancy, folic acid and pregnancy vitamins, exercising safely in pregnancy, and common pregnancy symptoms. We have dedicated compassionate guides for more challenging situations: severe morning sickness, gestational diabetes, pre-eclampsia warning signs, pelvic girdle pain, mental health in pregnancy, miscarriage support, Group B Strep, and DVT in pregnancy.

Our NHS antenatal appointments timeline explains what happens at every routine check so you can prepare and ask the right questions. As birth approaches, we cover signs that labour has started, the stages of labour, pain relief options, how to put together your personalised birth plan, and our practical hospital bag checklist. For less-common paths through birth, we have guides to breech baby, assisted delivery, perineal tears and episiotomy, premature birth, recovering from a caesarean, and twin pregnancy.

After birth, our postnatal recovery guide covers what to expect in the weeks following delivery, alongside our breastfeeding guide and newborn care resource. Every page is free and every page runs in your browser.