Interactive
Will your period land on your trip?
Cycles vary, trips get booked months ahead. Enter what you know and the calculator works out how likely it is that the trip loses at least a given number of days — and what those days cost.
days
days
days
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days
Chance the trip is touched at all
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Days lost on average
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That much of the budget
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Days of the trip lost
Chance
Value lost
Each row includes the ones below it: 3 days or more already counts the cases where 4 or 5 days go. Day 1 of the cycle is the first day of the period, and the trip is assumed to be booked without knowing where in the cycle it will land — so this is long-run risk, not a forecast for one specific date.
Other tools: caticloo.com/tools/