Bankroll Management Calculator

Work out bankroll management instantly with clear inputs, formula shown and shareable results.

About Bankroll Management Calculator

Flat staking risks a fixed amount so the bankroll falls linearly, while percentage staking recalculates each time and decays geometrically, which is why it can never reach zero. At 2% a bankroll survives 50 straight losses flat-staked but retains 82% of its value under percentage staking, which is the whole argument for proportional bet sizing.

Formulas

Flat staking

bankroll after n losses = bankroll - stake x n

Percentage staking

bankroll after n losses = bankroll x (1 - risk fraction) ^ n

Worked example

With the default values below, Bankroll Management Calculator returns Stake per bet of $20.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Bankrollminimum 0.01: 1,000
Risk per betaccepts 0.1–50 %: 2 %
Losing streak to surviveminimum 1: 10

Results

Stake per bet: $20.00
Bankroll after the streak at flat stakes: $800.00
Bankroll after the streak at percentage stakes: $817.07
Consecutive losses that would clear a flat-staked bankroll: 50

Step by step

1Values used
2Flat staking
3Percentage staking
4Stake per bet= 20.00
5Bankroll after the streak at flat stakes= 800.00
6Bankroll after the streak at percentage stakes= 817.07
7Consecutive losses that would clear a flat-staked bankroll= 50

Assumptions and limits

The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Bankroll Management figure worked out?

bankroll after n losses = bankroll - stake x n. Flat staking risks a fixed amount so the bankroll falls linearly, while percentage staking recalculates each time and decays geometrically, which is why it can never reach zero.

Why does this matter?

At 2% a bankroll survives 50 straight losses flat-staked but retains 82% of its value under percentage staking, which is the whole argument for proportional bet sizing.

What do I need to enter?

Enter bankroll, risk per bet, losing streak to survive. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.