Why these three
They are the questions behind most of our research. A strategy that looks good has to survive its costs — the reason our overnight study turned a real edge into a loss. It has to be sized so the worst stretch is survivable — the subject of our Monte Carlo drawdown article. And if you take it to a prop firm, the rules decide more than the strategy does, as our FTMO simulation found. The calculators let you run the same checks on your own numbers.
Each calculator's maths is tested against a separate Python implementation and against known answers before it is published. They are educational models, not advice: they only know what you type in, and they say on each page what they can't account for.
Download a free strategy
Need a strategy to put into the calculators? Start with one that has an honestly measured record — 70% winners across 155 trades over 16 years, net of costs. The free PDF gives you the market, the timeframe and the exact rules in plain English, plus every single trade it has taken.
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