Unit Size Calculator

Calculate your optimal betting unit size based on bankroll and risk tolerance.

Your total bankroll dedicated to gambling.
Conservative = 200 units (lower variance), Moderate = 100 units, Aggressive = 50 units, or set your own.
How many units to bring to a single session. Typically 20-40 units.

Unit Size Results

Number of Units in Bankroll
Unit Size
Minimum Bet (1 unit)
Standard Bet (1 unit)
Max Bet (3 units)
Max Bet (5 units)

Session Bankroll

Session Bankroll
Sessions from Total Bankroll
Session as % of Total

Unit Sizes at Different Risk Levels

Risk LevelUnitsUnit SizeMax Bet (5u)Session (30u)

Betting Spread Guide

Minimum (low count / no edge)
2 units (slight edge)
3 units (moderate edge)
4 units (strong edge)
5 units (maximum bet)
Guidelines:
Conservative (200 units): ~0.5% risk of ruin with 1% edge
Moderate (100 units): ~5% risk of ruin with 1% edge
Aggressive (50 units): ~20% risk of ruin with 1% edge
Source: Blackjack Attack by Don Schlesinger; Wong "Professional Blackjack"