Tools
Trading calculators that do the risk math honestly
Five calculators built on the same formulas as the Trading OS journal: position size, R and risk/reward, risk per trade and daily limit, liquidation price, prop challenge. Every formula is shown, every example can be checked by hand.
Position sizeCoins and USDT, forex lots, futures contracts — from risk and stop.R and risk/rewardPlanned RR, result in R, breakeven win rate and expectancy.Risk and daily limitRisk in money, stops to the daily limit, losing streaks.Liquidation priceLong and short, isolated margin, stop versus liquidation.Prop challengeStops to the limits, winners to target, average trades and days.Prop firm rulesLimits, targets and minimum days for FTMO, Topstep, Apex and more — with source links.
Terms behind the calculators
Let size and R be calculated for every trade
In the Trading OS journal, risk, position size and the result in R are filled in from entry, stop and exit — with the same formula as here.
No sign-up — the journal runs in your browser; an account is only needed for sync.