Tools · Calculator

Bankroll Calculator

What a budget costs per hour at a given stake and pace, and how long it typically lasts.

Bankroll

Stake

Spins / hour

bets in bankroll

expected loss / hour

−$13.51

typical swing / hour (1σ)

±$70.71

hours at expected rate

37 h

wagered / hour

$500

edge

2.70%

Reading the result

At $10 a spin and 50 spins an hour you wager $500 per hour and lose $13.51 of it on average. The hour-to-hour swing (±$70.71) is much larger than the expected loss, which is why sessions feel random and years do not. “Hours at expected rate” is an average; a bad hour can take a third of a $500 bankroll.

Method and assumptions

Even-money bets. Expected loss = stake × spins / 37. Swing = stake × √spins (σ ≈ 1 per unit for even money).