Position sizing converts a risk budget into a quantity: decide the cash you will risk, divide by your stop distance times the per-unit value, and round down to whole contracts (or compute lots for forex).
It is the single biggest lever over drawdown. Sizing so a normal losing streak never approaches the daily loss limit is what keeps an account alive.
See it on your own trades.
Merlin computes the metrics and rule distances above from your imported history, and checks your next trade against them before you enter.
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Firm figures reflect published rules at the time of writing. Firms revise rules often, so verify against the firm's site before relying on them.
Merlin's gauges derive from closed trades. Your firm watches live equity including open positions.
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