Pregnancy Due Date Calculator
Estimate due date from last menstrual period using the Naegele rule.
Use the calculator below, then review the formula, a numeric example, and the reference table to understand how the pregnancy due date calculator result is produced.
Calculator inputs
Result
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What is this calculator?
This guide supports the Pregnancy Due Date Calculator, a focused resource for people researching pregnancy due date calculator results and related clinical metrics. The on-page tool keeps inputs simple while the sections below explain the math, a worked example, and reference ranges where they exist. Clinical screens on educational sites should never delay emergency care when red-flag symptoms appear. Vitamin D conversions depend on compound and assay; confirm supplementation plans with a healthcare professional when deficiency is suspected. Protein grams per kilogram should scale with kidney function directives from your care team when applicable. Internal links below help search engines understand topical clusters and help readers continue their journey without friction. Caffeine sensitivity varies by genetics, pregnancy, and drug interactions; energy drinks can exceed perceived coffee equivalents. Carb and fat percent models assume calorie targets are already reasonable for your maintenance or goal phase. Ad placements are spaced so inputs and results remain readable on small screens, which supports policy-friendly layouts. Glycemic load combines portion size with carbohydrate quality; it complements—not replaces—overall diet pattern assessment. Calories per meal splits are planning aids for shift workers, athletes, and parents juggling schedules. Searchers often compare several formulas before settling on a routine, which is why we cite the equation explicitly and separate screening from diagnosis. Intermittent fasting windows are unsafe for some medications and conditions; clinician clearance is essential before experimenting. When Pregnancy Due Date Calculator outputs conflict with how you feel, prioritize clinician review over any website summary.
How it works
Naegele rule: due date ≈ LMP + 280 days; gestational age from days since LMP.
Example
60 days since LMP → about 8 weeks 4 days gestational; ~220 days until due date.
Reference Table
| Value | Meaning |
|---|---|
| LMP + 280 | Classic 40-week obstetric default |
| Ultrasound | Often refines dating |
| IVF | Embryo age may differ from LMP |
FAQ
- How accurate is LMP dating?
- When is ultrasound used?
- Preterm signs?
- Why 280 days?