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Miracle Odds Calculator

Result

Calculated result -1 Based on the values entered.
↗ Math

Miracle Odds Calculator (Littlewood's Law) The Miracle Odds Calculator applies Littlewood's Law idea: given the odds of a rare event and how many chances you get per day, it estimates how long until it happens. Enter the odds and daily chances. — free online calculator.

Formula

Expected days = (1-in-N odds) ÷ Chances per Day
  • Miracle Odds Calculator calculates its result from In, N Odds, Chances Per Day. It uses the formula Expected days = (1-in-N odds) ÷ Chances per Day. Change any input to recalculate the result instantly.
  • The main inputs are In, N Odds, Chances Per Day. Enter them in the units and format shown in the calculator.
  • Keep comparable quantities in compatible units whenever the formula combines or compares them.
  • Changing any input above recalculates the result with the same calculation engine used by this page.

Example: Miracle Odds

Inputs
  • In: 2
  • N Odds: 3
  • Chances Per Day: 4

Using In = 2, N Odds = 3, Chances Per Day = 4, the calculated result is -1.

Sample result: Calculating…

Frequently asked questions

What does the Miracle Odds calculate?

Miracle Odds Calculator (Littlewood's Law) The Miracle Odds Calculator applies Littlewood's Law idea: given the odds of a rare event and how many chances you get per day, it estimates how long until it happens. Enter the odds and daily chances. — free online calculator.

Which values should I enter?

Enter In, N Odds, Chances Per Day using the units and format shown beside each field.

What formula does this calculator use?

The calculator uses the following relationship: Expected days = (1-in-N odds) ÷ Chances per Day.

Why might my result differ from another source?

Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.

Does the result update automatically?

Yes. Changing an input updates the result using the same calculation engine shown on this page.

Page information

Updated: October 7, 2026