Lottery Probability Calculator

Lottery odds are calculated using combinations — the number of ways to choose k winning numbers from a pool of N, without regard to order. The odds are typically millions or tens of millions to one against winning the jackpot, making lotteries among the most negative expected value activities available

The calculator uses the standard published formula for lottery probability. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches, watts. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: Main draw odds = C(N, k) = N! / (k! × (N−k)!). Each step in the calculation is shown so you can verify the result manually.