What is the mathematical formula for quorum?

It depends on three variables:

x = total number of members

y = percentage of members required to determine z:

z = number more or less than y required to make a quorum.

As an example, let's say we have a membership of 27. The number required to have a quorum is 3 more than 40% of the membership. So, here the quorum would be:

0.4 * 27 + 3 = 13.8, which would normally be rounded up to 14. Rounding, using either the ceiling or floor function, can also be another variable in the equation.

Most quorums are simpler than this. If a quorum is 1 more than 50% of membership, then the formula is:

Floor((0.5*x)+1)

where x is the number of total members.