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Gestational Age Tracker — result sheet
Weeks and days since the last period at any reference date.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: days = asOf - LMP (UTC); weeks = floor(days/7); leftover = days mod 7.
Obstetric weeks count from the last period, about two weeks before conception. Clinical dating can differ by ultrasound; this is calendar arithmetic for tracking only.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- First day of last period — Gregorian date.
- Reference date — Must be on or after the last period.
Worked example
| Input | Value |
|---|---|
| First day of last period | 2024-01-01 |
| Reference date | 2024-04-01 |
13 weeks, 0 days (91 days).
Assumptions and limits
- Gregorian dates 0001-9999 at UTC midnight.
- Reference on or after LMP.
- Tracking aid only, not medical advice.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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