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Calculators that show their working

Three calculators for the numbers traders get wrong most often. No signup, nothing stored, and each one checked against hand-worked cases before it went up.

The calculators

Prop firm drawdown calculator

Your floor and your room, day by day, for static, trailing end-of-day, trailing intraday and locking drawdown.
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Position size calculator

Contracts, lots or shares for a given risk and stop. Futures point values built in, always rounded down.
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Risk of ruin calculator

The odds of reaching a target before a drawdown floor, computed exactly rather than simulated.
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See your own trading clearly

Open the demo to see every page on sample data, or start your own journal. The Free plan is yours to keep.

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