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Size the trade before you take it.
Your account size, an entry, a stop and the loss you accept. Out comes the position size that keeps the loss where you put it — fees included, because a size that ignores them breaks its own limit.
Other free tools
Trade journal analyzerDrop in a CSV of closed trades and read what a win rate hides: profit factor, expectancy, maximum drawdown, and the worst streak.Buy-and-hold backtestTest a portfolio the boring way. Pick weights, pick a start date, and see what holding would have returned — with the drawdown it took to get there.Chart readerUpload a screenshot of any chart. It measures the candles, recovers the price series, and runs the platform's own indicators over it.