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Trading calculators

Position size, risk-reward, drawdown recovery and R-multiple — free, in the browser, no sign-up. The same maths Mantis runs on every trade you log.

The calculators

Position size calculator Account size, risk %, entry and stop → shares, units or lots, with dollar risk and R targets. Risk-reward calculator Entry, stop, target and size → R:R, dollar risk and target price. Drawdown recovery calculator Drawdown % or peak/trough → gain needed to recover, optional time at a given return. R-multiple calculator Entry, stop and exit → the R result. Optional size for dollar P/L.

Mantis is the iOS trading journal that runs this maths on every fill — position size, R-multiple, risk-reward and drawdown — without a spreadsheet.

Download on theApp Store

Free to start · iOS 18+ · No account required

Important: Mantis is a trading journal and analytics tool. These calculators are for educational purposes and are not investment advice, not financial advice, and not a recommendation to buy or sell any security or instrument. Trading involves risk; past performance does not guarantee future results. Consult a qualified professional before making financial decisions.