Pregnancy Due Date Calculator Philippines, 2026
Find your estimated due date (EDD), current pregnancy week, and trimester. Supports LMP, conception date, and ultrasound dating. Includes SSS maternity benefit info and DOH prenatal checkup schedule.
🤰 3 calculation methods
📅 EDD + gestational age
🇵🇭 SSS + PhilHealth maternity benefits
Calculation Method
Day 1 of bleeding, not last day
28 is average. 21-35 normal range.
Why your due date matters
Your estimated due date (EDD) is when you reach 40 weeks. Only about 5% of babies are actually born on this exact date — most arrive within 1-2 weeks before or after. Knowing your EDD helps you plan prenatal visits, file SSS maternity benefit (must be 60 days before delivery), and prepare your hospital bag.
Estimated Due Date
—
Enter your LMP to compute
Gestational age—
Trimester—
Conception (est.)—
Days remaining—
How the due date is calculated
The standard medical formula is Naegele’s Rule, developed by German obstetrician Franz Naegele in 1812. It assumes a 28-day cycle with ovulation on day 14, and adds 280 days (40 weeks) to the first day of your last menstrual period.
Naegele’s Rule (LMP method)
EDD = LMP + 7 days − 3 months + 1 year
Or simply: LMP + 280 days
If irregular cycle: LMP + 280 + (cycle length − 28) days
For irregular cycles, we adjust by the difference from 28 days. A 32-day cycle adds 4 days to the EDD; a 25-day cycle subtracts 3 days. For conception date, we add 266 days (38 weeks from conception). For ultrasound dating, we work backward from the measured gestational age — this is the most accurate method, especially in the first trimester when fetal size is highly consistent.
Trimester breakdown
| Trimester | Weeks | What’s happening | Key milestones |
|---|---|---|---|
| 1st | 1-13 | Embryo develops into fetus; all major organs forming | First prenatal visit, NIPT/NT scan, morning sickness peak |
| 2nd | 14-27 | Rapid growth, gender visible, mother feels first kicks | Anatomy scan (18-22w), glucose screening, file SSS maternity early |
| 3rd | 28-40 | Final growth, position settles, prep for birth | Weekly checkups from 36w, GBS test, hospital bag, file maternity leave |
Key milestones by week
Week 6-8
First heartbeat
Visible on ultrasound. Confirm pregnancy with OB-GYN.
Week 12
End of 1st trimester
Miscarriage risk drops sharply. Many parents announce now.
Week 18-22
Anatomy scan
Detailed ultrasound. Baby’s sex usually identifiable.
Week 24
Viability
Baby has reasonable survival chance if born early (NICU support).
Week 28
3rd trimester starts
Glucose test for gestational diabetes. Movements get stronger.
Week 36
Full term approaching
Weekly OB visits. GBS test. Begin maternity leave filing.
Week 37
Full term
Baby is considered ready for life outside the womb.
Week 40
Estimated due date
Only 5% of babies arrive on this exact day. Normal range: 38-42w.
DOH-recommended prenatal checkup schedule
The Philippine Department of Health recommends minimum 8 prenatal visits over the course of a normal pregnancy. The full schedule:
| Visit | Gestational age | What happens |
|---|---|---|
| 1st | Before 12 weeks | Confirm pregnancy, baseline labs (CBC, urinalysis, blood type, HIV/HBV/syphilis screen, Pap smear if due), first ultrasound |
| 2nd | 20 weeks | Anatomy scan (or 18-22w), measure fundal height, fetal heart rate |
| 3rd | 26 weeks | Glucose challenge test (gestational diabetes screening) |
| 4th | 30 weeks | Tetanus toxoid booster if needed, fetal position check |
| 5th | 34 weeks | Position confirmation, growth check |
| 6th | 36 weeks | GBS swab (Group B Strep), prep for delivery |
| 7th | 38 weeks | Cervical check, final prep, sign hospital pre-admission |
| 8th | 40 weeks | Cervical check, decide induction vs wait if overdue |
SSS Maternity Benefit — what every mom should know
SSS pays a cash benefit equal to 100% of your average daily salary credit × 105 days (live birth) or 60 days (miscarriage/stillbirth). For a solo parent, it’s 120 days. The maximum benefit in 2026 is roughly ₱70,000-₱70,875 depending on contribution level.
Eligibility requirements
- At least 3 monthly contributions in the 12-month period before the semester of childbirth
- Notify your employer (or SSS directly if self-employed/voluntary) within 60 days of conception — yes, ideally before week 14
- SSS contribution can be paid for the current month even if you just registered
How to file
- Notify SSS via the My.SSS portal at member.sss.gov.ph as soon as pregnancy is confirmed (use the Maternity Notification e-form). For employed members, your HR files this for you.
- Within 10 days of giving birth, submit the Maternity Reimbursement Application along with: birth certificate (or fetal death certificate for miscarriage), Maternity Notification proof, medical certificate.
- Benefit is paid via direct credit to your UMID-ATM card, MyPay PayMaya, or your registered bank account within 2-4 weeks of approval.
PhilHealth maternity benefit (in addition to SSS)
PhilHealth has separate maternity packages that cover the hospital cost itself (not cash to you):
- Normal Spontaneous Delivery (NSD): ₱5,000 case rate
- Cesarean Section (CS): ₱19,000 case rate
- Maternity Care Package (MCP): ₱8,000 in PhilHealth-accredited facilities (covers prenatal + delivery + postnatal)
- Newborn Care Package: ₱1,750 (covers screening tests, BCG, Hep B vaccine)
PhilHealth + SSS benefits stack. A formal-sector employee delivering via CS could see ₱70,000 SSS cash + ₱19,000 PhilHealth hospital coverage = ₱89,000 total in benefits.
Frequently Asked Questions
My cycle is irregular. Is this calculator still accurate?
Less accurate, yes. The LMP method assumes ovulation around day 14. If your cycles vary by more than a week month-to-month, your actual ovulation could be 7-10 days off either direction, making the EDD off by the same amount. Best alternative: get a first-trimester ultrasound (6-12 weeks). Fetal crown-rump length measurement at this stage dates pregnancies to within ±3-5 days regardless of cycle. Use the Ultrasound tab here once you have that scan.
Is “due date” really 280 days from LMP? Doesn’t conception happen later?
Yes, technically the embryo doesn’t exist for the first ~14 days after LMP (conception happens around day 14 of the cycle). But the medical convention is to count from LMP because it’s the easier date to remember and pinpoint than ovulation/conception. So when an OB says “you’re 8 weeks pregnant,” the actual embryo is about 6 weeks old. Total pregnancy is 280 days from LMP = 266 days from conception. Both refer to the same baby; just different starting points.
When can I file SSS Maternity Notification?
As soon as you have a positive pregnancy test confirmed by a doctor — even at 4-6 weeks. SSS rules require notification “as soon as pregnancy is confirmed” and at minimum before the start of the semester of childbirth. Don’t wait: some employers require you to file early to qualify for their leave policies. The My.SSS portal at member.sss.gov.ph lets you file online in 5 minutes. You’ll need your SSS number, expected date of delivery (from this calculator!), and your latest contribution proof.
What if I’m not employed but want SSS maternity benefit?
Register as a voluntary or self-employed SSS member at any SSS branch (or via My.SSS online). Start paying monthly contributions (minimum ₱560/month at the lowest bracket in 2026). You need 3 contributions in the 12 months before the semester of childbirth. So if you conceive in May 2026, your “semester of childbirth” is the July-December 2026 semester, and your qualifying period is July 2025 to June 2026. You need at least 3 contributions paid within that window. Start ASAP if you’re planning to conceive or already pregnant.
Can both parents file SSS benefits?
The mother gets the maternity cash benefit (105 days). The father gets a separate SSS Paternity Leave benefit if he’s an active SSS member — 7 days paid leave for the first 4 deliveries of his legal wife. Both can be filed simultaneously and don’t reduce each other. There’s also the 105-Day Expanded Maternity Leave Law which lets the mother transfer up to 7 of her 105 days to the father (or any “alternate caregiver”), giving him up to 14 days total leave.
What does “full term” mean exactly?
“Full term” is 37 weeks 0 days through 41 weeks 6 days, per ACOG (American College of OB/Gyn) and adopted by Philippine OBs. Within that, the breakdown is: early term (37w0d-38w6d), full term (39w0d-40w6d), late term (41w0d-41w6d), and post-term (42w+). Most OBs in the Philippines recommend induction by 41-42 weeks because risks rise after that. Babies born 24-36w are “preterm” with varying NICU needs.
Why do some calculators give a different due date?
Three reasons: (1) Some don’t adjust for cycle length and assume strict 28 days. (2) Some count “pregnancy” from conception instead of LMP, so they’re 2 weeks off. (3) Some use the older 280-day rule strictly while others use 281 (accounting for the fact that calendar months vary). Our calculator uses the standard ACOG-recommended Naegele’s Rule with cycle-length adjustment, which is what your OB-GYN will use. If your ultrasound dates are different from your LMP dates by more than 7 days in the first trimester, trust the ultrasound — it’s more accurate.
How accurate is the due date really?
Only about 5% of babies are born on their exact EDD. About 60% arrive within a week of EDD (week 39-41). About 90% arrive within 2 weeks of EDD (week 38-42). Twins typically arrive earlier (around 36w). The EDD is a useful planning anchor — not a deadline. Your OB will monitor more closely as you approach and pass 40 weeks.
Estimate only. This calculator provides educational dating estimates. Always confirm pregnancy and EDD with a qualified OB-GYN through proper clinical examination and ultrasound. Consult your doctor for medical advice.