Exact odds of consecutive losses and the drawdown a streak would cause.
P(run ≥ k in n trades)Exact probability, not a rule of thumbOpen Calculator
How the toolkit works
Assumptions stay visible
Every result lists the inputs that produced it. Scenario adjustments are shown next to the numbers they change.
Formulas you can check
Each calculator includes a methodology section with the exact formulas and a worked example using your own figures.
Nothing is saved
Calculations run in your browser. No account, no database and no stored history. Refresh the page and the inputs are gone.
A simple workflow for planning an EA
1. Project the growth
Enter your EA's win rate, reward-to-risk, trade frequency and risk per trade in the EA Growth Projection Calculator to see a 36-month scenario, with trading costs and conservative and optimistic variations.
2. Size every trade
Use the EA Risk Per Trade Calculator to turn the risk percentage into a maximum loss and a lot size for your symbol and stop distance.
3. Understand the downside
Check the EA Drawdown Recovery Calculator to see how much gain a drawdown would demand, and how long recovery could take at your expectancy.
Traders who run expert advisors on MT4 or MT5 and want to test the assumptions behind a strategy before trading it: how the account could grow, how much each trade risks, how hard a drawdown would be to recover, and how likely losing streaks and deep drawdowns are.
Are these calculators free?
Yes. All six calculators are free, need no account and run entirely in your browser.
Do the calculators predict my EA's results?
No. They produce mathematical scenarios from the numbers you enter. Live results depend on market conditions, execution, costs and broker conditions that no calculator can predict.
Is my data stored?
No. Inputs are never sent to the server, and the pages use no cookies, local storage or database. Refreshing the page clears everything.
Important: Estimation Only
This calculator provides mathematical projections based on the assumptions and historical/backtest statistics entered by the user. It is not a guarantee or prediction of future trading results. Actual EA performance may vary significantly due to market conditions, volatility, liquidity, spread, slippage, execution quality, commission, swap, news events, market sentiment, changes in market regime, broker conditions and differences between backtest, forward-test and live trading.
Past performance and backtest results do not guarantee future results.