Free trading calculators — no login, no ads
Ten calculators for position sizing, risk and strategy math. Everything runs in your browser; your numbers never leave your device. Built by the team behind the ReziFX trade journal.
Position Size Calculator
Forex, crypto, stocks, futures and indices in one tool — with JPY pip handling and account-currency conversion.
Lot Size & Pip Value Calculator
Lots, mini and micro lots plus the exact pip value for your pair and account currency.
Prop Firm Challenge Simulator
Monte Carlo simulation of your challenge: pass probability, expected attempts and total cost — with drawdown rules.
Risk of Ruin Calculator
How likely is your account to hit its ruin threshold? Analytic formula plus Monte Carlo verification.
Expectancy Calculator
Your edge in R per trade: expectancy, profit factor and break-even win rate from four inputs.
Kelly Criterion Calculator
Full, half and quarter Kelly position sizing from win rate and payoff ratio — with a no-edge warning.
Drawdown Recovery Calculator
A 33% loss needs +50% to break even. See the recovery math for any drawdown, with a full reference table.
Losing Streak Calculator
The probability of X losses in a row for your win rate — Monte Carlo based, not the misleading textbook formula.
Monte Carlo Trading Simulator
Simulate thousands of equity curves from win rate, R and risk per trade: percentile bands, drawdown and ruin risk.
Trading Compounding Calculator
Realistic account growth projection — including the drawdown reality most compounding calculators ignore.
Stop estimating — measure your real numbers
Every calculator here asks for your win rate and average R. The ReziFX journal computes both automatically from your captured TradingView trades.
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Educational tools. Not financial advice — trading involves substantial risk of loss.