Know Your Risk Before You Trade
The same calculators professional traders use every day. Position sizing, risk/reward, and compound growth — no signup, no paywall.
Position Size Calculator
Calculate the optimal number of shares based on your risk tolerance and stop loss.
Risk/Reward Calculator
Evaluate if a trade is worth taking based on potential profit vs. potential loss.
Compound Growth Calculator
See how your investments grow over time with compound interest and regular contributions.
Kelly Criterion Calculator
The Kelly formula tells you the mathematically optimal percentage of your bankroll to risk. Most traders use half-Kelly or quarter-Kelly for safety.
Drawdown Recovery Calculator
After a loss, you need a bigger gain just to get back to even. This calculator shows why protecting capital is more important than making money.
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How to Use These Trading Calculators
Position Size Calculator: Enter your account size and how much you're willing to risk per trade (most professional traders use 1-2%). Set your entry price and stop loss level. The calculator tells you exactly how many shares to buy so that if your stop is hit, you only lose the amount you defined. This eliminates the guesswork and emotional position sizing that destroys most trading accounts.
Risk/Reward Calculator: Before entering any trade, you should know your potential profit vs. potential loss. A risk/reward ratio of 2:1 or higher means you can be wrong 50% of the time and still be profitable. The breakeven win rate tells you the minimum accuracy you need for the trade to have positive expected value.
Compound Growth Calculator: Shows the power of consistent investing over time. Even small monthly contributions grow dramatically with compound interest. Use this to set realistic expectations and stay motivated during drawdowns.
Kelly Criterion Calculator: The Kelly formula determines the mathematically optimal bet size based on your edge. Full Kelly maximizes long-term growth but with high volatility. Most professional traders use half-Kelly (50%) or quarter-Kelly (25%) for a smoother equity curve. If Kelly returns a negative number, the strategy has negative expected value and should not be traded.
Drawdown Recovery Calculator: This calculator reveals the asymmetric nature of losses. A 50% drawdown requires a 100% gain to recover. A 90% loss needs 900% just to break even. This is the single best argument for conservative position sizing — preventing large drawdowns is far easier than recovering from them.