Pregnancy Due Date & Gestational Age Calculator (Naegele Rule)

Track gestational age, trimester progress, and cycle-adjusted delivery countdown.

Days Remaining Until Due Date
182 days
Current Gestational Age 14 weeks
Pregnancy Completion 35 %
Total Gestation Horizon 280 days
Inputs
days
Days elapsed since the first day of the last menstrual period (LMP).
days
Average menstrual cycle length in days (adjusts ovulation offset).
Results & Graph
Days Remaining Until Due Date
182 days
Current Gestational Age
14 weeks
Pregnancy Completion
35 %
Total Gestation Horizon
280 days

Days Remaining Until Due Date

Graph 1 • Days Since Lmp Sensitivity Recalculates the domain equation across 50% to 150% of the primary input while holding other parameters constant.
0 days 124.7 days 249.5 days 50%: 231 days 231 50% 75%: 206.5 days 206.5 75% 100%: 182 days 182 100% 125%: 157.5 days 157.5 125% 150%: 133 days 133 150%
Graph 2 • Primary & Supporting Metric Comparison Compares the primary output alongside supporting domain benchmarks.
Days Remaining Until Due Date 182 days Current Gestational Age 14 weeks Pregnancy Completion 35 % Total Gestation Horizon 280 days
Graph 3 • Exact Output Table & Units Displays each calculated output in its exact domain unit.
Days Remaining Until Due Date182 daysCurrent Gestational Age14 weeksPregnancy Completion35 %Total Gestation Horizon280 days
Summary: At 14 weeks 0 days gestation, 182 days remain in a 280-day cycle-adjusted pregnancy.
Summary: At 14 weeks 0 days gestation, 182 days remain in a 280-day cycle-adjusted pregnancy.

Formula & Mathematical Methodology: Pregnancy Due Date Reference Equation

TotalGestationDays = 280 + (cycleDays − 28)
RemainingDays = TotalGestationDays − daysSinceLmp
TotalGestationDays = 280 + (cycleDays − 28); RemainingDays = TotalGestationDays − daysSinceLmp
  • daysSinceLmp: Days Since Lmp (days)
  • cycleDays: Cycle Days (days)

Rounding: Intermediate calculations retain full IEEE-754 floating-point precision; displayed clinical and fitness metrics round to 1 or 2 decimal places.

Worked Example: Benchmark Scenario: Pregnancy Due Date

Track gestational age, trimester progress, and cycle-adjusted delivery countdown.

  1. Enter your current anthropometric, laboratory, or training measurements in the units indicated.
  2. Substitute the values into the reference formula: TotalGestationDays = 280 + (cycleDays − 28); RemainingDays = TotalGestationDays − daysSinceLmp.
  3. Compare the primary output and supporting thresholds across all three custom SVG charts.
Result: Evaluates Pregnancy Due Date using TotalGestationDays = 280 + (cycleDays − 28); RemainingDays = TotalGestationDays − daysSinceLmp.

Frequently Asked Questions

How is the Pregnancy Due Date & Gestational Age Calculator (Naegele Rule) calculated?

It evaluates TotalGestationDays = 280 + (cycleDays − 28); RemainingDays = TotalGestationDays − daysSinceLmp using your entered parameters and displays supporting clinical or training thresholds alongside three interactive SVG visualizations.

Can I compare multiple scenarios side by side?

Yes. Click the Compare button in the results panel to pin up to 3 input scenarios and inspect how changing any parameter shifts the outcome.

Are my health or fitness inputs stored on any server?

No. Every calculation executes 100% inside your browser tab so sensitive health and wellness numbers never leave your device.

Health & Fitness • Pregnancy & Maternal Guide

How to Use the Pregnancy Due Date & Gestational Age Calculator (Naegele Rule): Practical Guide & Visual Analysis

Calculate estimated obstetric due date (280 days from LMP), current gestational weeks, and days remaining. Adjust the inputs above to view instant numerical outputs, three custom domain-specific SVG graphs, and reference methodology. Whether you are researching pregnancy due date & gestational age calculator (naegele rule), pregnancy due date, pregnancy due date gestational age, pregnancy & maternal calculator, this interactive tool helps you calculate estimated obstetric due date (280 days from LMP), current gestational weeks, and days remaining.

Interpreting the 3 Custom Visual Graphs & Key Outputs

As you adjust Days Since Lmp, Cycle Days, the calculator immediately computes Primary physiological or clinical metric, Supporting reference benchmarks, 3-Panel custom domain SVG visualization and updates all three domain-specific SVG charts in real time. Instead of relying on a single static figure, you can inspect the primary domain diagram, component breakdown, and multi-point trajectory curve to see how changing your inputs shifts the final result. Use the Compare (up to 3 scenarios) button to evaluate side-by-side variations before making a decision.

Real-World Benchmark & Planning Tips (Global Clinical & Exercise Physiology Reference)

In our benchmark scenario (Benchmark Scenario: Pregnancy Due Date), Evaluates Pregnancy Due Date using TotalGestationDays = 280 + (cycleDays − 28); RemainingDays = TotalGestationDays − daysSinceLmp. Keep in mind that uses peer-reviewed population equations and standard physiological constants. For related calculations in Health & Fitness, explore BMI Calculator (Body Mass Index), Calorie Needs & TDEE Calculator, Body Fat (US Navy), Lean Body Mass & Body Surface Area Calculator.