How much capital do you need to run a Martingale EA on MT5?

Why nobody honest quotes a minimum deposit

Search for this question and you will find confident answers ranging across two orders of magnitude, usually attached to a sales page. The spread exists because the question is underspecified. A Martingale EA's capital requirement is not a property of the EA; it is a property of the configuration you run it with and the account you run it on. The same software can be conservatively survivable on one setup and one bad week from a margin call on another.

So instead of a number, this article gives you the machinery: the four inputs that determine the requirement, the worst-case arithmetic that connects them, and a way to test your own configuration before any money is at risk. If a vendor quotes you a universal minimum deposit without asking about your settings, treat it as a marketing figure, not an engineering one.

The four inputs that set the requirement

First, base lot size: the volume of the initial trade in a cycle. Everything else scales from it linearly, so halving the base lot halves the whole worst-case calculation. Second, the multiplier: the factor applied to position size at each recovery level. This is the most sensitive input, because it compounds. A multiplier of 1.5 and a multiplier of 2.0 sound adjacent and behave nothing alike after eight levels.

Third, the maximum recovery level cap: how many times the EA is permitted to add before it stops and waits, or the equity stop resolves the basket. This bounds the geometric series. Fourth, your broker's terms: the margin required per lot on the traded instrument and the leverage on your account, which together decide how much of your balance is consumed simply holding the basket open, before floating losses are counted.

Two of these, base lot and level cap, you set directly in the EA inputs. The multiplier is also configurable within the strategy's design range. The broker terms you inherit, which is one reason account selection is part of risk management rather than an afterthought.

The worst-case basket, step by step

The calculation that matters is the fully extended basket: every permitted level open at once, with the market at the furthest adverse point before the equity stop fires. Total volume is the base lot multiplied by the sum of the geometric series across your level cap. With a multiplier of two and eight levels, that sum is 255 times the base lot; with ten levels it is 1,023 times. This is the arithmetic behind every Martingale blow-up story: people size for the first trade and are ambushed by the sum.

That total volume drives two separate demands on your balance. Margin is the collateral the broker locks to keep the basket open, which is total volume times the per-lot margin requirement. Floating drawdown is the unrealised loss across the basket at maximum adverse excursion, which depends on the level spacing and the distance the market has travelled against you. Your account has to cover both at the same time, with headroom, because a margin call at the bottom of the excursion converts a temporary drawdown into a permanent loss at the worst possible price.

Notice what this calculation does to intuition. A seemingly minor act of impatience, raising the multiplier a notch or allowing two extra levels, can multiply the capital requirement several times over. The relationship between settings and requirement is geometric, and geometric relationships punish rounding up in the aggressive direction.

Leverage changes the packaging, not the risk

Higher leverage lowers the margin locked per lot, which makes the worst-case basket cheaper to hold open. It is tempting to read that as reducing the capital requirement. It does not. The floating drawdown of the extended basket is exactly the same at any leverage, because it is a function of position size and price distance, not margin. What high leverage actually buys you is the ability to dig a deeper hole before the broker intervenes.

The practical guidance follows directly: size your account against the floating drawdown of the worst case, not against the minimum margin to open it. Leverage determines whether your broker lets you take the risk; only your balance determines whether you survive it. UK and EU retail accounts, with leverage capped by regulation, force more honest sizing here than offshore accounts offering leverage in the hundreds, which flatter a Martingale configuration right up until they do not.

Model it before you fund it

You could build all of this in a spreadsheet, and some subscribers do. To make it easier, Grit Markets includes a simulator on this site: enter a base lot, multiplier, level cap and account size, and it shows the total worst-case volume, the margin load at your broker's terms, and the floating drawdown at full extension, alongside where your equity stop would intervene. Watching the drawdown figure respond as you nudge the multiplier is the fastest cure for aggressive settings we know of.

Use the simulator to answer one question: if the worst case my settings permit happened next week, is the resulting loss one I have already accepted? If the answer is no, reduce the base lot or tighten the caps until it is yes, and only then consider funding an account. Where you also review backtest data during that process, keep the standing caveat in view: simulated results. Backtests do not predict live performance.

None of this is a promise about outcomes, and none of it is investment advice. It is arithmetic, offered so that whatever decision you make about capital is an informed one. A Martingale EA run inside a properly sized worst case is a high-risk instrument with a defined downside. Run outside one, it is an account waiting for its ending. The difference is decided before the first trade, which is why this article exists.