Position Size & 'What If I'd Invested' Calculator
Position sizing tells you how much to buy so a single trade only risks a set slice of your account. Risk amount = account size × risk % (many traders use 1-2%); position size in coins = risk amount ÷ the distance between your entry and stop-loss price. The 'what if I'd invested' mode works backwards: coins = amount ÷ price then, and today's value = coins × price now. Both run in your browser; position sizing manages risk, the time machine shows historic returns.
How it works
In position-sizing mode, enter your account size, the percentage you're willing to lose on the trade, your entry price and your stop-loss. The tool returns the dollar amount at risk and the number of coins that keeps the loss within that budget if your stop is hit.
In 'what if I'd invested' mode, enter a past price, today's price and the amount you would have invested to see the coins, current value and multiple. These are estimates for general information, not financial advice — past performance does not predict future results.
Position (coins) = (account × risk%) ÷ |entry − stop|
Estimates for general information only — not financial or tax advice.
Frequently asked questions
What risk percentage should I use?
Risk management is personal, but many traders cap risk at 1-2% of their account per trade so no single loss is catastrophic. This is not advice on what you should choose.
What is a stop-loss?
A price at which you'd exit to cap your loss. The gap between entry and stop is your per-coin risk, which drives the position size.
Is the 'what if' result realistic?
It ignores fees, taxes and the difficulty of holding through volatility. It's a what-if illustration, not a prediction or advice.
Does a bigger position mean bigger profit?
And bigger losses. Position sizing is about controlling downside, not maximising upside.
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Last updated: 2026-06-14