Pregnancy Due Date Calculator
Pregnancy due date: EDD with week markers and next steps.
Calculator
Pregnancy Due Date Calculator Results
pregdue: Day 420 from LMP — ~Week 60 mark. Confirm by ultrasound.
Due-Date Breakdown
| Measure | Value | Context |
|---|---|---|
| Answer | Day 420 from LMP | primary result |
| Context | ~Week 60 mark | supporting |
| Basis | LMP day 140 | input-derived |
| Method | Naegele +280d | convention used |
| Reference | ACOG/IOM bands | healthy range |
| Next | Confirm by ultrasound | action |
Recommendations
- ▸Confirm every date with your provider and first-trimester scan.
- ▸Re-run as trimesters turn — targets move with gestation.
- ▸Log symptoms and questions for visits; math supports care, never replaces it.
- ▸pregdue: Day 420 from LMP — ~Week 60 mark. Confirm by ultrasound.
Results
Score
84/100
Rating
Day 420 from LMP
Main result
~Week 60 mark
Supporting value
LMP day 140
Basis
Naegele +280d
Method
Confirm by ultrasound
Action
Educational only, not medical advice. Dating and gain math follows ACOG/IOM conventions; confirm with your provider.
Visualizations
Gauges
Score vs 100
Pregnancy Score
Formula
Convention math for this question.
Alternative Form
Variables
| Symbol | Name | Unit | Description |
|---|---|---|---|
| A | Anchor one | - | Date/measure |
| B | Anchor two | - | Length/height |
| C | Context | - | Status/type |
| R | Answer | - | Computed result |
| S | Score | 0-100 | Completeness |
Explanation
Standard reproductive math on careful day counts.
Derivation
ACOG/IOM conventions; scans and providers confirm.
Step-by-Step Calculation
Follow each step to understand how the result is calculated from your inputs.
Enter the anchors.
Apply the convention.
Add the reference band.
Name the next step.
Confirm with care team.
Score the result.
Worked Examples
See how the calculator works with different scenarios.
Scenario
Typical dates.
Inputs
Calculation
Convention applied
Result
Answer computed
Interpretation
Personalize with your dates.
Understanding Your Result
Your Result: Score: 84/100
Typical range: EDD = LMP + 280 days; gain 5-18 kg by BMI; nursing +330-400 kcal; safe loss ~0.5 kg/week.
What This Means
The output converts dates and measures into due dates, gestational age, gain bands and nutrient targets.
Why It Matters
Dated planning turns anxious guessing into calm checklists — milestones, screening windows and gain curves.
Professional Interpretation
Clinicians date from LMP then refine by first-trimester ultrasound; nutrition scales by trimester and nursing status.
Dates vs precision
Cycle timing estimates ovulation; ultrasounds measure it. Math plans, scans confirm.
Averages vs you
Bands fit populations; providers personalize for twins, conditions and history.
Recommendations
- •Confirm dating with your provider
- •Gain within the IOM band
- •Fuel nursing adequately
- •Move only when cleared
Educational Content
Introduction
This calculator turns dates and measures into gestational age, targets and timelines.
Concept Explanation
Day counts anchor gestation; BMI bands anchor gain; nursing status anchors calories; safe rates anchor timelines.
Applications
Benefits
- •EDD estimates
- •Week/day ages
- •Gain bands
- •Calorie/protein/water targets
- •Safe timelines
Limitations
- •Irregular cycles blur dating
- •Ultrasound refines estimates
- •Twins differ
- •Conditions personalize needs
- •Not a diagnosis
Best Practices
- •Use first-day LMP carefully
- •Track three cycles
- •Confirm with providers
- •Re-run as trimesters turn
- •Pair targets with visits
Common Misconceptions
Practical Tips
- •Log day-one dates
- •Confirm dating early
- •Gain steadily, not suddenly
- •Protein at every meal
- •Walk when cleared
- •Ask providers early
Common Mistakes
Assumptions
This calculator makes the following assumptions to provide estimates:
Limitations
Be aware of these limitations when using this calculator:
Frequently Asked Questions
Answers to common questions about this calculator.
How is the due date calculated?
What is gestational age?
What are the trimesters?
How much weight should I gain?
How many extra calories in pregnancy?
How much protein in pregnancy?
How much water in pregnancy?
How does IVF dating work?
When did conception happen?
How do weeks convert to months?
What are key milestones?
When should I call my provider?
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Glossary
Technical terms used in mortgage calculations explained in plain language.
- Gestational age
- Weeks and days since the last menstrual period.
- EDD
- Estimated due date: LMP plus 280 days.
- Trimester
- Three ~13-week pregnancy phases.
- Naegele rule
- LMP + 280 days dating convention.
- IOM gain ranges
- Weight-gain targets by pre-pregnancy BMI.
- Viability
- ~24 weeks when survival outside becomes possible.
- Full term
- 39-40 completed weeks.
- Conception day
- ~Ovulation day; LMP + 14 in 28-day cycles.
- IVF dating
- Transfer-day anchored gestation math.
- Milestone
- Dated development or screening checkpoint.
- Quickening
- First felt movement, ~16-22 weeks.
- Fundal height
- Belly measure roughly matching weeks mid-pregnancy.
Authoritative References
Trusted sources and standards referenced by this calculator.
Applicable Standards
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Page Information
2026-09-16
2.0.0
Free to use for educational and professional purposes.