Due Date Calculator
The Due Date Calculator calculates exact, real-time domain outputs in active voice. The Due Date Calculator supports both natural conception (via LMP or ovulation date) and Assisted Reproductive Technology (IVF Day-3 or Day-5 blastocyst transfer) to provide an obstetric countdown and trimester schedule.
Interactive Due Date Calculator Workspace
Launch Interactive Due Date Calculator →
Due Date Calculator Input Parameters & Defaults
| Current Gestational Age (Days) | 140 | Total days of pregnancy completed (e.g., 20 weeks = 140 days). |
| Cycle Length Adjustment (Days vs 28) | 0 for 28-day cycle or IVF; +2 for 30-day cycle. |
Due Date Calculator Mathematical Formula
\text{EDD}_{\text{IVF-5}} = D_{\text{transfer}} + 261\text{ days}, \quad \text{EDD}_{\text{LMP}} = \text{LMP} + 280\text{ days}Due Date Calculator Worked Example
Currently 140 days (20 weeks) into a standard 280-day pregnancy.
- Gestational progress = (140 / 280) × 100 = 50.0% complete.
- Days remaining until Estimated Due Date = 280 - 140 = 140 days (20 weeks).
- Third Trimester begins at Day 196 (Week 28), which is 56 days away.
Only about 4% to 5% of babies arrive on their exact Estimated Due Date, while ~80% are born within ±2 weeks of the EDD (between 38 and 42 weeks).
Due Date Calculator Glossary of Key Terms
Current Gestational Age (Days) (Due Date Calculator)
Total days of pregnancy completed (e.g., 20 weeks = 140 days).
Cycle Length Adjustment (Days vs 28) (Due Date Calculator)
0 for 28-day cycle or IVF; +2 for 30-day cycle.
Basal Metabolic Rate (BMR)
The minimum daily energy your body expends at complete rest to sustain vital organ and cellular functions.
Total Daily Energy Expenditure (TDEE)
The total calories you burn in 24 hours combining Basal Metabolic Rate, food thermogenesis, and physical activity.
Lean Body Mass (LBM)
Total body weight minus adipose fat mass, comprising skeletal muscle, bone, water, and organs.
Visceral Adiposity
Deep abdominal fat surrounding internal organs that directly influences cardiometabolic health.
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Due Date Calculator Frequently Asked Questions
Q: Why are IVF due dates more precise than LMP due dates?
In IVF, the exact fertilization date and embryo stage (Day-3 cleavage or Day-5 blastocyst) are known with certainty, eliminating ovulation timing variability.