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Free trading calculators & simulators
Boring tools that save accounts. Size every trade, stress-test your strategy and plan your drawdowns with calculators that show their math. No signup, nothing to install, and your numbers never leave your browser.
- Free
- No signup
- Exact formulas
- Runs in your browser
Trading Strategy Simulator
Enter win rate, payoff and risk. See hundreds of possible equity curves, drawdowns and losing streaks.
Open the tool →EssentialPosition Size Calculator
Work out how many shares, contracts or lots to trade from your account size, risk and stop-loss.
Open the tool →RiskRisk of Ruin Calculator
Find the chance your account is wiped out, and the risk per trade that keeps it under 1%.
Open the tool →EdgeRisk Reward & Break-Even Win Rate Calculator
See expectancy, break-even win rate and profit factor for any win rate and risk:reward ratio.
Open the tool →RiskDrawdown Recovery Calculator
After a loss of X%, how much must you earn to get back? And how long will it take?
Open the tool →PlanningTrading Compounding Calculator
See how a balance, regular deposits and a monthly return grow over the years.
Open the tool →SizingKelly Criterion Calculator
Find the risk per trade that maximises long-run growth, and what half or quarter Kelly costs you.
Open the tool →Which tool do I need?
Why these tools
Most traders spend their time on entries and almost none on size and risk, yet size and risk decide who survives. A good entry with a reckless position size still blows up. A modest edge with disciplined sizing compounds for years.
Each tool here answers one question clearly, shows the formula behind it, and includes worked examples you can load with one click. They are built to be quick enough to use before every trade.
Tools to manage risk. Indicators to find the setups.
Position sizing and risk control keep you in the game. Indicators help you decide where to take your shots. Use them together.
Questions about the tools
Are the trading calculators free?
Yes. Every tool is free, needs no signup and runs entirely in your browser. Your numbers are never sent to a server.
How accurate are the calculations?
The closed-form tools (position size, drawdown recovery, risk and reward, Kelly, compounding) use exact formulas, shown on each page. The simulators use Monte Carlo with thousands of random runs, so results vary slightly between runs and converge as you add more.
Is this financial advice?
No. The tools are for education and planning. They show what your assumptions imply and cannot predict real results. Markets change, and trading carries a risk of loss.
Which tool should I start with?
Start with the position size calculator to decide how much to trade, then the strategy simulator to see how your win rate and payoff play out, and the risk of ruin calculator to check your size is safe.
Who builds these tools?
Minimalist Trading is run by a.b, who has published trading indicators on TradingView since 2015. The tools reflect the same preference for clear, simple logic.
Last updated October 2026. For education only. Not financial advice.