What is Vacation Planner?
Vacation Planner is a web tool that helps you plan your vacation dates, taking into account the probability of menstruation for women with irregular cycles.
It uses a Monte Carlo simulation to estimate the probability of having a period on each day of your vacation, based on your cycle parameters and the date of your last period.
How does it work?
- You enter the date of your last period, the minimum and maximum cycle length (in days), and the period length (in days).
- You specify one or more vacation periods (start and end dates).
- The algorithm simulates thousands of possible cycles and calculates the probability of having a period for each day of your vacation.
- The result is shown as a color-coded calendar, where each cell shows the probability for that day (from green to red).
Who is this for?
- Women with irregular menstrual cycles who want to plan vacations or important events.
- Partners and families who want to avoid planning trips during high-probability days.
- Anyone who wants a visual, data-driven approach to menstrual cycle prediction.
How to use
- Fill in your last period date, cycle range, and period length at the top of the page.
- Add one or more vacation periods (you can add multiple by clicking "Add vacation period").
- Click Calculate probabilities.
- Scroll down to see the calendar with color-coded probabilities for each day.
How does the algorithm work?
The algorithm uses a Monte Carlo simulation:
For each simulation, it randomly picks a cycle length from your range, and simulates periods starting from your last period date. For each vacation day, it counts how often that day falls within a period. The final probability is the ratio of simulations where the day is "in period" to the total number of simulations.
Is my data safe?
No data is stored or shared.