GapAlgo

Free trading calculators

Four small tools for the arithmetic that decides more outcomes than entries do. Nothing is stored and nothing is sent anywhere.

Position size calculator

Work out how many shares or contracts to take so a stop costs exactly what you intended.

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R multiple calculator

Express a trade as a multiple of what it risked, so results compare across symbols and account sizes.

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ATR stop calculator

Place a stop at a multiple of average true range, so the distance fits the symbol's own volatility.

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Options expected move calculator

Estimate the move an option is pricing in before expiry, from implied volatility and days remaining.

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