Free trading calculators
Small, honest tools for the arithmetic behind a trade — sizing, risk, and compounding. Free, no sign-up, no account. They tell you what a rule should do; whether a strategy actually beats buying and holding on real data — most don't, and these are the few that do — is what the backtester is for. Sizing and risk come first — the groundwork before you ever test.
By using these calculators, you agree to our Terms of Use and Disclaimer. Results are hypothetical and educational — not investment advice. You decide and execute on your own broker.
Bring its list of trades and see it re-tested honestly — real costs, next-bar fills, every trade measured against simply holding. Free, no sign-up. A trade list can't prove a strategy is sound (and we say so on every screen), but it will show you what costs and buy & hold do to it.
Bring your strategy →How many shares or units to buy so a losing trade costs only what you decided to risk.
Open the calculator →Your reward-to-risk on a trade — and the win rate you'd need just to break even at it.
Open the calculator →Score a trade in R, and turn a win rate and average win/loss into an expectancy per trade.
Open the calculator →The gain you need to climb back from a loss — and why deep drawdowns are so punishing.
Open the calculator →Grow a starting balance at a periodic return, with optional contributions — see compounding work.
Open the calculator →The compound annual growth rate that turns a start value into an end value — the honest way to compare returns across different time spans.
Open the calculator →Project what regular contributions grow to — and see honestly how dollar-cost averaging compares to investing the same total as a lump sum.
Open the calculator →Net profit or loss on a long or short trade — after fees — in dollars and as a return.
Open the calculator →Your new average price after buying more, and the move it takes to get back to break even.
Open the calculator →The bet size an edge mathematically justifies — and why most traders use a fraction of it.
Open the calculator →Monte-Carlo odds of blowing up: how bet size and edge decide whether variance wipes you out.
Open the calculator →Return earned per unit of risk, versus just holding cash — the standard risk-adjusted score.
Open the calculator →How many trades before an edge is more than luck — a floor to clear, never proof it works.
Open the calculator →Net profit on a crypto trade after exchange fees — in dollars and as a return on what you put in.
Open the calculator →What a trade actually risks: the dollars to your stop, the move it is, and the share of your account.
Open the calculator →Return per unit of downside risk — like Sharpe, but it only counts the losses, not the upside swings.
Open the calculator →The loss a portfolio is unlikely to exceed over a horizon at a confidence level — and why real tails are worse.
Open the calculator →Convert volatility between daily, weekly, monthly and annual — the square-root-of-time scaling, done for you.
Open the calculator →How much a position tends to move for a 1% move in the market — from its correlation and the two volatilities.
Open the calculator →Reshuffle an edge thousands of ways to see the spread of outcomes — how often it profits, and how deep it can dig.
Open the calculator →Paste two return series to get their correlation — how much two assets move together, from -1 to +1.
Open the calculator →A calculator shows what a rule should do on paper. A backtest is how you find the rare few that actually beat simply buying and holding — costs on, losses shown, no look-ahead — so when you build one that survives, you'll know it isn't a fake edge, and can prove it forward before you risk real money. It won't tell you you'll win — nothing honest can.