Visit a site like pooltool.io to see current delegated total for the network (top left corner), currently 30.24b ADA but changes day to day. Each epoch we have 0.05 (active slot coefficient network parameter) of the available slots on average assigned a leader slot (chance to produce a block), which is 5 * 24 * 60 * 60 * 0.05 = 21600 blocks per epoch on average.

Doing the simple maths for, say, 1 million ADA delegated to a pool yields 1,000,000 / 30,240,000,000 * 21600 = ~ 0.7 blocks per epoch. Alternatively you can do 1/21600 * 30,240,000,000 to get a result of 1,400,00 ADA for one block on average.

Visit a site like pooltool.io to see current delegated total for the network (top left corner), currently 30.24b ADA but changes day to day. Each epoch we have 0.05 (active slot coefficient network parameter) of the available slots on average assigned a leader slot (chance to produce a block), which is 5 * 24 * 60 * 60 * 0.05 = 21600 blocks per epoch on average.

Doing the simple maths for, say, 1 million ADA delegated to a pool yields 1,000,000 / 30,240,000,000 * 21600 = ~ 0.7 blocks per epoch. Alternatively you can do: 1/21600 * 30,240,000,000 to get a result of 1,400,000 ADA for one block, on average.