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Due Date Calculator
Due Date Calculator: Find Your Estimated Delivery Date
Enter your last period, conception date, IVF transfer, or ultrasound date above to get your estimated due date instantly, plus a full plan for what comes next: insurance-covered breast pump, lactation support, and postpartum prep.
Check My Due DateH
Hygeia Health
Pregnancy Due Date Calculator
Estimate your due date using any of four clinical methods. Select the one that matches what you know.
Trusted by Hospitals
Loved by Moms
Backed by Lactation Experts
Most common method. Uses the first day of your last menstrual period.
The most common starting point for estimating your due date.
Most cycles are 28 days. Adjust if yours is shorter or longer.
The day of ovulation or confirmed conception. Adds 266 days (38 weeks).
Day 5 blastocyst is most common. Check your clinic notes if unsure.
Two pink lines change everything, and the very first question most moms ask is when the baby is actually coming.
Our due date calculator gives you an estimated delivery date in seconds, based on the method that fits your situation: last menstrual period, known conception date, IVF transfer, or an early ultrasound.
A due date is your cue that the countdown to meeting your little one has begun. It tells you how many weeks you have to see your provider, order your insurance-covered breast pump, and line up lactation support before your baby arrives.
At Hygeia, we create the hospital-grade pumps relied on 50,000+ moms, and we've gathered everything below to help you get the most out of coming weeks.
What Your Estimated Due Date Actually Tells You
Your estimated due date (EDD) is the date your pregnancy reaches 40 weeks, not a guaranteed delivery day. Only about 1 in 20 babies arrive on their exact due date. Most healthy pregnancies deliver anywhere between 37 and 42 weeks, so think of your EDD as the center of a window rather than a fixed appointment.
That window still matters. It's what your provider uses to time prenatal screenings, schedule your third-trimester visits, and confirm your baby's growth is on track. It's also what determines when your insurance opens the door to order your free breast pump.
How Your Due Date Is Calculated
The calculator above uses whichever method matches the information you have.
01
Last Menstrual Period (LMP)
Adds 280 days (40 weeks) to the first day of your last period. This is the most common method and assumes a 28-day cycle.
02
Conception Date
Adds 266 days to the date you conceived, since conception typically happens about two weeks into a cycle.
03
IVF Transfer Date
Counts forward from your embryo transfer date, adjusted for whether it was a Day 3 or Day 5 transfer.
04
Ultrasound Dating
Uses your baby's measurements from an early ultrasound, which is often the most accurate method if your cycles are irregular.
A quick note: If your provider's due date differs slightly from this calculator, trust your
provider. Ultrasound measurements taken in the first trimester generally override LMP-based estimates.
Your Trimester Timeline at a Glance
Once you have your estimated due date, here's what each stage of pregnancy generally covers so you know what to prepare for and when.
| Trimester | Weeks | What to Focus On |
|---|---|---|
| First Trimester | Weeks 1–13 | Confirm pregnancy, book your first prenatal visit, start prenatal vitamins |
| Second Trimester | Weeks 14–27 | Anatomy scan, start researching breast pumps, check insurance eligibility |
| Third Trimester | Weeks 28–40 | Get your breast pump prescription, order your pump, pack your hospital bag |
| Fourth Trimester | Weeks 0–12 postpartum | Physical recovery, feeding routine, lactation support if you need it |
Getting Your Breast Pump Prescription Before Your Due Date
Your insurance company treats a breast pump as durable medical equipment, which means a prescription from your provider is required before your claim can be processed. The prescription itself takes your provider under two minutes to write, usually at any prenatal visit after 28 weeks.
You don't have to chase this down yourself. When you fill out Hygeia's insurance verification form, our team contacts your doctor's office directly, collects the prescription, and manages the paperwork so your pump ships before you need it. Read our full breakdown of how to get a breast pump fully covered by insurance for a step-by-step walkthrough.
Get My Breast Pump PrescriptionWhen to Start Your Free Breast Pump Insurance Process
Most insurance plans open their breast pump ordering window 30 to 60 days before your due date, which means the number you just got from this calculator determines when you should apply. Starting at 28 to 32 weeks pregnant gives you enough runway to get your prescription, complete insurance verification, and receive your pump before your baby arrives.
Under the ACA mandate, most non-grandfathered health plans cover a breast pump at $0 out-of-pocket. Hygeia's insurance team checks your specific plan, confirms which models you qualify for, and handles the paperwork on your end.
Check My CoverageBreast Pump Insurance Eligibility: Who Qualifies
If you have health insurance through an ACA-compliant employer plan, the marketplace, or Medicaid in most states, you almost certainly qualify for a free breast pump. Here's what determines your eligibility.
- ✓ You're pregnant or have delivered within the last 12 months for most plans.
- ✓ Your plan is non-grandfathered, meaning it was created or updated after the ACA took effect in 2010.
- ✓ You have a breast pump prescription from your OB-GYN, midwife, or primary care provider.
- ✓ You haven't already used your benefit for this pregnancy, since most plans allow one pump per pregnancy.
Lactation Support Starts Before Baby Arrives
Breastfeeding counseling from a certified lactation consultant (IBCLC) is a covered benefit under the same ACA preventive care mandate that covers your pump, and you don't have to wait until you're struggling to use it. Through Hygeia's partnership with Nest Collaborative, you can book a virtual IBCLC consultation before delivery to talk through latch expectations, flange sizing, or exclusive pumping plans, and again afterward if something feels off.
If you already know you'll be exclusively pumping or expecting a NICU stay, getting a consultation lined up now means you have a real person to call in the first exhausting weeks instead of searching forums at 2am.
Book a Lactation ConsultationPreparing for the Fourth Trimester
The weeks right after delivery bring their own learning curve, from physical healing to figuring out your baby's feeding patterns. A few guides worth reading before your due date arrives.
First Month Postpartum Guide
Walks through healing week by week, from delivery through 12 weeks.
Read the guide → Cluster Feeding GuideExplains why newborns cluster feed in the evenings and how long it lasts.
Read the guide → Mental Health During Pregnancy and Postpartum GuideCovers what's typical and when to reach out for help.
Read the guide →Free Baby Stuff and Freebies Before Your Due Date
Your breast pump isn't the only thing you can get covered or free before your baby arrives. Between insurance benefits, hospital baby boxes, diaper and manufacturer promotions, expecting moms can save real money on the basics well before the due date you just calculated.
Our guide walks through exactly where to look, including Medicaid and WIC programs, retailer welcome boxes, and sample programs most moms never hear about until it's too late to use them.
See All the Free Baby Stuff You Qualify ForMore Resources to Explore
A few more guides to help you use the time between now and your due date well.
Frequently Asked Questions
How accurate is a due date calculator?
A due date calculator gives you a solid estimate, but only about 1 in 20 babies are born on their exact calculated date. Most healthy pregnancies deliver somewhere between 37 and 42 weeks, so treat your due date as the middle of a range rather than an exact day.
What if my due date from this calculator doesn't match my doctor's estimate?
Trust your provider's number. First-trimester ultrasound measurements are generally more accurate than a calculation based on your last period, especially if your cycles are irregular or you're unsure of your exact LMP.
How soon can I order my free breast pump once I know my due date?
Most insurance plans open their ordering window 30 to 60 days before your due date. Filling out an insurance verification form as early as 20 to 24 weeks lets Hygeia confirm your eligibility ahead of time so you're ready to order the moment your window opens.
Do I need a prescription to get my breast pump covered?
Yes. Insurance companies classify breast pumps as durable medical equipment and require a prescription from your OB-GYN, midwife, or primary care provider before processing your claim. Hygeia's team can contact your provider directly to collect it for you.
Is lactation consultation covered by insurance too?
In most cases, yes. Breastfeeding support from a certified IBCLC is a preventive care benefit under the ACA, and Hygeia's partnership with Nest Collaborative offers virtual consultations that are typically covered at no cost.
Can I use this calculator if I conceived through IVF?
Yes. Enter your embryo transfer date and specify whether it was a Day 3 or Day 5 transfer, and the calculator adjusts accordingly since IVF due dates are calculated from a known conception window rather than an estimated ovulation date.
Start Preparing for Your Due Date Today
Knowing your due date is the first step. Getting your insurance-covered breast pump, lining up lactation support, and reading up on the fourth trimester are what actually make the weeks after delivery easier. Moms deserve more than a guessing game, and Hygeia's team is here to help you use this time well.
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