Chance Converter: Percent, 1 in N, Odds, Per Day and Per Year

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A chance e.g. 1 in 250, 0.4%, 1/250 or 4 to 1 against

How many of those chances you hold e.g. tickets

Per what?

A chance each day e.g. 1 in 20, 5% or 1/20

Days in the period

Years in a lifetime optional

People it applies to optional

Enter your numbers, then press Calculate.

From the book, Chapter 1. The school raffle: 250 tickets, one prize. One ticket is 1/250 = 0.004 = 0.4%, or 1 in 250; two tickets are 0.8%, 1 in 125. “4 to 1 against” is a chance of 1 in 5, 20%. A one-in-a-million daily risk is about 1 in 2,740 a year and 1 in 35 over 80 years; across 50 million people it happens about 50 times a day, 18,250 a year.

Exact arithmetic, worked the way the book shows. Everything stays in your browser: no sign-up, nothing stored or sent.