Martingale Calculator — Forex Grid Position Sizing

The martingale strategy doubles (or multiplies) your position size after each losing trade. The theory is that when the market eventually reverses, the winning trade will recover all previous losses plus a small profit. In practice, it works in ranging markets but causes catastrophic losses during strong trends.

It depends on your starting lot, multiplier, and account balance. With a $10,000 account, starting at 0.01 lots with a 2x multiplier: Level 1 = 0.01, Level 2 = 0.02, Level 3 = 0.04... by Level 10 you are trading 5.12 lots. Use this calculator to see exactly how many levels your account can sustain before margin call.

Martingale can produce consistent profits in ranging markets but will eventually blow an account in a trending market. The risk is asymmetric — many small wins followed by one catastrophic loss. Professional traders generally avoid pure martingale, but some use modified versions with hard stop-losses or position size caps.

The classic multiplier is 2 (double after each loss). A multiplier of 1.5 is a softer "mini-martingale" that grows slower and survives more levels but recovers losses more slowly. Anything above 2 is extremely aggressive and will blow an account within a few levels of a trending move.

Martingale doubles position size after every loss, assuming the market must eventually reverse. The problem: a streak of 8–10 consecutive losses (statistically normal in any strategy) requires position sizes 256–1024× the original. On a $10,000 account starting with $10 trades, by trade 10 you need $10,240 for a single trade — your entire account. Even one extended trending move against you causes total account loss.