Whale Pregnancy Due Date and Progress Calculator
Whale Pregnancy Calculator
This calculator estimates a whale pregnancy timeline based on the whale type you select and your estimated conception date. It provides an average due date, a birth window (earliest to latest typical date), and a progress percentage as of a chosen “As of date”.
How the calculator works
The calculator starts from your conception date and applies a species-based pregnancy length. Many whale species have a typical range rather than one fixed number, so the calculator uses:
- Minimum length - earliest typical birth date
- Average length - expected due date (avg)
- Maximum length - latest typical birth date
If you choose Other / Custom, the calculator uses your custom pregnancy length (in days).
Core formulas
The due date is computed by adding the pregnancy length to the conception date:
\(\text{DueDate} = \text{ConceptionDate} + \text{PregnancyDays}\)
The progress percentage is computed from the “As of date”:
\[ \text{ProgressPercent} = \left(\frac{\text{DaysSinceStart}}{\text{AvgPregnancyDays}}\right)\times 100 \]
Where:
- DaysSinceStart is the number of days from conception date to “As of date”
- AvgPregnancyDays is the average pregnancy length used for the selected whale type
Timeline table and stages
The timeline table lists key dates at a chosen interval (weekly, biweekly, or monthly). Each row includes a stage label based on progress:
- Early pregnancy - under 34%
- Mid pregnancy - 34% to 66%
- Late pregnancy - 67% to 100%
- Overdue - above 100%
Overdue rows are highlighted to make critical outcomes easier to spot.
Customize Columns
You can reorder and show/hide columns using the Customize Columns button above the table. Changes apply only when you click Apply & Rebuild, ensuring the table does not change accidentally when closing the modal.
Important note
This tool provides an estimate based on typical pregnancy ranges for the selected whale type. Real pregnancies can vary due to individual biology and environmental factors. Use the modifier if you need a simple way to model a slightly longer or shorter pregnancy.