Definition
The total amount of money you have set aside specifically for betting. Stake sizing (units, Kelly) is expressed as a percentage of bankroll so that bet size scales with what you can actually afford to risk.
Related terms
- Unit — A standardized stake (typically 1–2% of bankroll) used to track results independent of dollar amounts, e.g. +12.5u.
- Fractional Kelly (Half-Kelly) — Betting a fraction (often ½) of the full Kelly stake — far smoother bankroll swings for slightly less growth.