Bankroll Calculator
Disciplined bettors decide stakes from bankroll, not from “feel.” Enter how much you are willing to devote to betting and what fraction you want on each play—the calculator outputs a flat unit size you can reuse until you rebalance.
This is not Kelly sizing and not tax or swap advice. It is a simple rule: stake = bankroll × (risk percent ÷ 100). Revisit the percentage when your roll moves materially or when volatility (see Variance Calculator) changes.
Unit Size from Bankroll
Adjust bankroll and risk %.
Table of Contents
How to Use This Calculator
Enter bankroll and risk percentage per bet. The tool outputs a flat stake size—one simple way to cap exposure per play.
Bankroll definition
Use the amount you are willing to devote to betting—not rent money.
Risk %
Common heuristics: 1% conservative, 2% aggressive for confident edges.
Flat vs Kelly
Flat sizing is stable; Kelly sizes dynamically—see Kelly tool for comparison.
Rebalance
Update bankroll after major swings or withdrawals.
Flat Unit Sizing
Unit ≈ bankroll × (risk% / 100)
Examples
Example 1 — $1,000 @ 1%
Unit ≈ $10.
Example 2 — $5,000 @ 2%
Unit ≈ $100.
Example 3 — Micro bankroll
$200 @ 1% → $2 units—may be below minimum bet; round up carefully.
Frequently Asked Questions
No—flat percentage. Use Kelly for edge-based sizing.
Not needed—only bankroll and risk percent.
Risk can stack—many bettors lower % when combining correlated legs.
Simplicity and emotional control—many pros still use it.
Only if you count bonus bankroll as part of risk capital.
