Rain or shine, decide with numbers.
30 years of weather data and the forecast tell you if a tent or rain insurance is worth its price.
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Your result will appear here
Fill in your event details, then click “Check my event”.
Chance of rain—
Loss if it rains—
Expected loss—
Break-even—
How it works
- 01
30 years of history
We count how often it rained at your place within a week of your date, in each of the last 30 years.
- 02
Blended with the forecast
Within 16 days of the event, the live forecast gradually takes over from the climate record.
- 03
A clear decision
We compare your expected loss with the price of protection, uncertainty included: protect, don't protect, or close call.
A transparent method, explained step by step.
Plan B is made by Dorian Girod, MSc Statistics student at ETH Zurich. The data, the formulas and their limits are set out in a short methodology note.