Risk and Sizing
How Much Can You Lose and Trade?
Margin Calculator
Enter balance, leverage and position size. See margin used, free margin, margin level and the price that triggers a margin call.
Position Size Calculator
Work out how many units to trade so that a stop-out loses a set percent of the account. Balance, risk percent, entry and stop in.
Lot Size Calculator
Forex lot size from balance, risk percent and a stop in pips. Shows standard, mini and micro lots, units and dollar risk.
Pip Value Calculator
What one pip is worth in your account currency for a given position size, pip size and exchange rate.
Stop Loss Calculator
Stop price, dollar loss and loss as a percent of the account for a stop set as a percent from entry, long or short.
Risk Reward Calculator
Reward to risk ratio from entry, stop and target, with costs, plus the win rate the ratio needs to break even.
Liquidation Price Calculator
A simplified isolated-margin liquidation price for a perpetual futures long or short, from entry, leverage and maintenance margin.
Edge and Performance
Does the Strategy Actually Earn?
Expected Value Calculator
Does the average trade make or lose money after costs? Win rate, average win, average loss and costs in, answer out.
Compounding Calculator
Compound a balance over any number of periods, add contributions, and see what one losing period does to the result.
Break Even Calculator
The price a trade must reach before it earns anything, once entry fee, exit fee and spread are counted.
Kelly Criterion Calculator
The Kelly fraction from a win rate and payoff ratio, with half and quarter Kelly, and why the inputs make it fragile.
Sharpe Ratio Calculator
Mean return, standard deviation and Sharpe ratio from a list of period returns, with the sampling noise shown.
Win Rate Calculator
Win rate from wins and losses, the 95 percent range it could really be, the break-even win rate and the sample size needed.
Free Backtester
Paste a list of closed trades and get the win rate, average win and loss, expectancy, profit factor, total, max drawdown and longest losing streak.
Drawdown Calculator
Drawdown from a peak and a low, the gain needed to recover, and the maximum drawdown of a list of balances.
Bot Ladders and Grids
Grid, Martingale and DCA Maths
Grid Trading Calculator
Spacing, profit per grid before and after fees, money per grid and open buy orders for a spot grid bot.
Martingale Calculator
Step by step units, average entry, margin used and break-even price of a doubling ladder, checked against your balance.
Average Down Calculator
Add to a losing position and see the new average price, the new exposure and the rise needed to get back to even.
DCA Calculator
Equal-sized buys at different prices: your average cost, units, value at the last price, and a one-buy comparison.
Simulators
Simulate the Bad Runs
Risk of Ruin Calculator
Simulates 5,000 runs of trades to show the chance the balance falls to a floor, the median result and the longest losing run.
Monte Carlo Analysis Simulator
Simulates 2,000 paths and shows the 5th to 95th percentile of the final balance and the maximum drawdown.
Bot Type Picker
Five questions, fixed rules and a table: which trading bots fit the limits you gave, and which have a worst case outside them.
Prop Firm Challenge Simulator
Simulates 2,000 challenge attempts to show the pass rate, the daily and total loss failures and the days run out.
Prop Firm Challenge Fee Calculator
Turns a challenge fee, a pass rate and a payout rate into the fees it takes to reach one first payout.
FAQ
Frequently Asked Questions
Are the tools free?
Yes. Every calculator and guide is free and needs no account. They run in your browser, so the numbers you enter stay on your device.
Is anything here financial advice?
No. It is general education and arithmetic. It does not consider your goals, money or situation, and nothing here recommends buying, selling or holding anything.
Where do the numbers in the examples come from?
Example numbers are made up to show how the maths works, and each page says so. Where a figure comes from a test we ran, the page names the date and the method.
Are the numbers on this page real?
Example numbers are made up to show how the maths works, and the page says so. A figure only counts as exact when the page says it was calculated on a stated date. Nothing you enter in a calculator leaves your browser.
Can I use this to decide whether to run a bot?
It can show whether a bot's numbers hold together and how much an account can lose. It cannot say what the market will do, and it is not advice. Use it to ask better questions, then read the terms of your own broker or exchange.
Can I rely on a calculator result?
A calculator returns exactly what the formula gives for the numbers you enter. It is only as good as those numbers, and it cannot see costs, gaps or rule changes that you leave out.
Know the Risk Before You Run It
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Trading carries a risk of loss