Pregnancy & Fertility Calculators
Choose the calculator that matches the date, measurement, or question you already have, then use the result as a clearer starting point for planning, symptom tracking, and conversations with your clinician.
Start With the Information You Already Have
You know the first day of your last period
Start with the Due Date, Ovulation, Period, or Pregnancy Week calculators to estimate gestational age, fertile timing, and the next milestones in your cycle.
You already have a scan, transfer date, or blood test
Use the Ultrasound Due Date, IVF Due Date, Hybrid Due Date, or Beta hCG Calculator when you are working from clinical measurements rather than cycle dates alone.
You want context around symptoms, growth, or pregnancy health
Use calculators like Weight Gain, AFI, FHR, Thyroid Fertility Risk, or Gestational Diabetes Risk to understand ranges and questions to raise with your care team.
How to Use These Calculators Well
Pregnancy and fertility timelines can feel confusing because different questions require different inputs. Some tools work best from the first day of your last menstrual period. Others are better when you already have an ovulation date, embryo transfer date, ultrasound measurement, or serial beta hCG result. Our calculator library is designed to help you start with the information you have, understand the estimate you get back, and see when a clinician should override the tool with scan findings or treatment dates.
Dating Pregnancy: LMP, Ultrasound, IVF, and Hybrid Estimates
Use LMP-based due date tools when your cycles are fairly regular and you are confident about your dates. Use ultrasound or IVF calculators when you have a first-trimester scan or transfer date, because those data points are often more clinically reliable than calendar estimates. Hybrid tools are useful when you want to compare multiple dating methods before your official due date is confirmed in care.
Trying to Conceive: Fertile Window, Ovulation, Implantation, and Testing
When the goal is conception, timing matters more than averages alone. Our ovulation, period, conception, luteal phase, follicular phase, implantation, and hCG calculators help you estimate fertile timing, understand the two-week wait, and choose better moments for intercourse or pregnancy testing. These tools are most useful when paired with real-world tracking such as OPKs, cervical mucus patterns, basal body temperature, or clinician-ordered testing.
Pregnancy Health Planning: Weight, Nutrition, and Risk Context
Some calculators are best used as conversation starters rather than predictions. Weight gain, gestational diabetes risk, thyroid fertility risk, prenatal vitamin, breastfeeding calorie, and postpartum tools can help you understand ranges, planning assumptions, and what questions to ask next. They do not diagnose disease or replace prenatal care, but they can make medical recommendations easier to follow and discuss.
Understanding Measurements From Reports and Scans
Clinical reports often include numbers without much explanation. Tools such as the Baby Growth, AFI, FHR, and Pregnancy Week calculators help translate common scan and prenatal report values into plain-language context. Their best use is to help you understand what the measurement refers to, how it is usually interpreted, and what additional context your clinician needs before drawing conclusions.
How We Review Calculator Content
Each calculator page is written to explain what input it uses, what estimate it can provide, where the model becomes less reliable, and when medical care should take priority. Our health content is drafted by human editors, checked against named clinical sources, and medically reviewed by Dr. Priti Agarwal, MBBS, D.G.O. The goal is not to turn a calculator into a diagnosis, but to make common pregnancy and fertility questions clearer, safer, and easier to discuss in a real appointment.
Use Calculators as Planning Tools, Not Diagnosis
If your symptoms are severe, your dates are uncertain, your cycle is irregular, you conceived through IVF, or your ultrasound and lab results do not match the calculator estimate, follow your clinician's guidance over the tool.