Consistency describes how evenly a trader makes money. A record built from many small green days is more repeatable, and easier to hold psychologically, than the same total made in one lucky session. There are two common ways to measure it.
Profitable days ratio
consistency = profitable trading days / trading days
A trading day is a calendar day with at least one closed trade; a profitable day is one whose net result is above zero.
Example: in October you traded on 18 days and 11 of them ended green. Consistency is 11 / 18 = 61%. Days without trades do not count either way, so taking a day off never hurts the number.
The prop firm consistency rule
Many prop firms add a rule of their own: no single day may carry more than a set share of the total profit, for example 40%. It exists to stop a trader from passing an evaluation with one oversized bet.
With a 40% rule this account would have to keep trading until the total reaches $4,500 (1,800 / 0.40) before it could pass, even if the profit target was already met. Each firm defines the rule differently, so read their terms rather than relying on a general figure.
In SetupBook
The "Consistency" card in Analytics shows the profitable days ratio, the count behind it, and the best and worst day. It is also one of the six components of the trader score, with a weight of 10%. To check a prop consistency rule, compare the best day on that card with the period's net P&L.