Pregnancy & baby calculators, calculated with care.
Free, fast, and based on published medical guidelines. From due date and ovulation to IVF dating and baby growth — clear answers from a tool you can trust.
Built on guidelines from
Available pregnancy tools
Built from real medical guidelines. New calculators added every month.
- PopularOpen tool
Due Date Calculator
Estimate your pregnancy due date from last period, conception, ultrasound, or a known due date.
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Pregnancy Week Calculator
How far along am I? Find your current week, trimester, and major pregnancy milestones.
- Open tool
Ovulation Calculator
Find your fertile window, peak ovulation day, and next 6 ovulation dates from your last period.
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Conception Calculator
Find when you most likely conceived from your last period, due date, or ultrasound.
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Reverse Due Date Calculator
Already have a due date? Work backward to find conception date, LMP, and pregnancy timeline.
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IVF Due Date Calculator
Calculate due date from embryo transfer — Day 3, Day 5, Day 6 transfers and FET cycles.
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FET Due Date Calculator
Frozen embryo transfer due date — Day 3, Day 5, Day 6 FET cycles using fertility-clinic math.
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Trimester Calculator
What trimester am I in? Find your current trimester (1st, 2nd, or 3rd) and trimester boundaries.
- NewOpen tool
Implantation Calculator
When does implantation happen? Find your implantation window (6-12 days after conception) and earliest test date.
- NewOpen tool
Pregnancy Test Calculator
When can I take a pregnancy test? Earliest reliable date for standard, early-detection, and blood tests.
- NewOpen tool
Chinese Gender Predictor
Predict baby gender using the traditional 24×12 lunar age chart. For entertainment only — not science.
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Pregnancy Weight Gain Calculator
Healthy weight-gain range based on pre-pregnancy BMI and current week, using IOM guidelines.
Why Pregora?
We built the kind of pregnancy tools we wished existed when we needed them ourselves — clean, accurate, mobile-first, and respectful of your time.
Medically grounded
Built from IOM, ACOG and WHO published guidelines. Sources cited on every tool page so you can verify the science behind each calculation.
Privacy-first
Calculations run entirely in your browser. Your last period date, weight, and any other input never leave your device.
Instant & fast
No accounts. No popups. No slow loads. Open the tool, get your answer in seconds — on any phone, tablet, or computer.
Frequently asked questions
Quick answers about Pregora pregnancy calculators, accuracy, privacy, and medical sources.
Are all the pregnancy calculators on Pregora free?▾
Yes. Every pregnancy calculator, ovulation tool, IVF due date estimator, and baby tool on Pregora is 100% free to use. We do not require an account, email signup, or any form of payment to access any tool on this site.
How accurate are the pregnancy calculators?▾
All Pregora calculators are built on published medical guidelines from the Institute of Medicine (IOM), American College of Obstetricians and Gynecologists (ACOG), and the World Health Organization (WHO). Each tool page lists the exact sources used. However, calculator results are estimates — only a healthcare provider can confirm pregnancy details with clinical precision.
Do you store or share the data I enter into the calculators?▾
No. Every Pregora calculator runs entirely in your browser. Your last menstrual period date, weight, height, embryo transfer date, ultrasound measurements, and any other input never leave your device. We do not store, transmit, or share calculator inputs with anyone.
Which medical guidelines does Pregora use?▾
We use Institute of Medicine (IOM) 2009 guidelines for pregnancy weight gain, ACOG Committee Opinion #700 for due date estimation, WHO child growth standards for baby percentiles, CDC growth charts for children over 2 years, and ASRM practice guidelines for IVF dating. Sources are cited on every tool page.
Can I use these pregnancy tools on my phone?▾
Yes — Pregora is built mobile-first. Every calculator works smoothly on iPhone, Android, and tablet devices. Pages load in under one second on mobile networks, and there are no popups or sign-up walls to interrupt your use.
How is a pregnancy due date calculated?▾
The standard method (Naegele's rule) adds 280 days to the first day of your last menstrual period (LMP), assuming a 28-day cycle. For irregular cycles, IVF pregnancies, or ultrasound-confirmed dates, the calculation is adjusted. Our Due Date Calculator handles all four methods.
What is the difference between IVF and natural pregnancy due date calculation?▾
With IVF, the embryo age and transfer date are precisely known, so the due date can be calculated more accurately than with last menstrual period (LMP) dating. Pregnancy is counted as 266 days from conception (egg retrieval). Our IVF Due Date Calculator handles Day 3, Day 5, Day 6 transfers plus fresh and frozen (FET) cycles automatically.
How often is Pregora updated?▾
We update tool calculations whenever underlying medical guidelines change, and review every blog post for accuracy quarterly. Each page shows a 'last updated' date so you always know how current the information is.
Recent pregnancy guides
Plain-English explanations of the medicine behind each calculator.
Due datesHow is a pregnancy due date calculated?
Naegele's rule, ultrasound dating, IVF cycles, and what to do when your dates don't match — explained with sources.
2026-04-25 · 8 min read
- Ovulation
Coming soon
What is the fertile window — and how to track it.
New guide launching soon
- IVF
Coming soon
Day 3 vs Day 5 vs Day 6 transfers explained.
New guide launching soon
