Choose a figure that changes nothing else.

This page turns "be careful" into a specific number. Work through it once, write the result down, and treat it as fixed for the period you chose.

Check the operator’s limits too Start with a limit

List your non-negotiables

Rent, bills, food, transport, savings, debt repayments. None of these may fund the bankroll, ever.

Choose only disposable money

Whatever remains — and that you would genuinely not miss — is the candidate ceiling. If the number embarrasses you, it is probably right.

Divide by four

Split the monthly ceiling into weekly allowances. A weekly figure is easier to notice when it runs out.

Set the same cap at the operator

Enter it as a deposit or loss limit so the system enforces it, not your memory.

Write the date and the number

Record it somewhere you will see it. A limit you cannot recall is a limit you do not have.

Rules that make the number stick

No top-ups. Running out early means the week is over, not that the ceiling was wrong.
No borrowing. Credit, overdrafts and loans are never part of a bankroll.
No recovery framing. Staking to win back a loss is the single most expensive habit in this subject.
Review monthly, calmly. Adjust the ceiling only between periods, never during one.

Ceremony is the point. The value here is not the arithmetic — it is that you decided once, in advance, and can point at a number when a session starts to feel urgent.