Account balance ($)
Risk per trade (%)
Stop loss (pips/points)
Symbol
Scaling method
Consecutive wins (for scaling)
Result (click to copy)
Frequently Asked Questions
What is fixed fractional position sizing?
Fixed fractional means risking the same percentage of your account on every trade (e.g. 1%). As your account grows, your position size grows proportionally. As it shrinks, your size reduces. This is the safest and most recommended method for consistent long-term growth.
What is the Kelly Criterion?
Kelly Criterion calculates the mathematically optimal bet size to maximise long-term growth: Kelly % = Win Rate - (Loss Rate / RR). Half-Kelly (50% of the Kelly amount) is recommended in practice as it reduces variance significantly while preserving most of the growth benefit.
What is anti-martingale scaling?
Anti-martingale increases position size after winning trades and decreases after losing trades — the opposite of martingale. This lets you capitalise on winning streaks while protecting capital during losing streaks. It's much safer than martingale and used by many professional traders.
Is martingale safe for prop firms?
No. Martingale (doubling size after each loss) is extremely dangerous for prop firm accounts. A short losing streak can breach your drawdown limit instantly. Most prop firms explicitly prohibit or heavily discourage martingale strategies. Use fixed fractional instead.