Position Size Calculator
Work out the position size that keeps your loss within a fixed percentage of your account.
Position sizing decides how much you actually risk on a trade. Enter your account balance, the percentage you want to risk, your entry and your stop-loss to see the position size that keeps your loss within that limit.
This is an educational tool, not financial advice. It assumes you can enter and exit at the prices shown; real fills, fees and slippage will differ.
Risk note: This calculator is for education only and is not financial advice. Crypto trading is high-risk; never trade with money you cannot afford to lose, and remember that fees, slippage and gaps can make real outcomes worse than any model.
FAQ
How do you calculate position size in crypto trading?
Decide the percentage of your account you are willing to lose if the stop-loss hits (commonly 1–2%), convert it to a dollar amount, then divide by the distance between entry and stop-loss per unit. Example: $5,000 account, 1% risk = $50; entry 100, stop 95 = $5 per unit; position = 10 units ($1,000). The stop distance, not conviction, sets the size.
What percentage of my account should one trade risk?
The widely used convention is 1–2% per trade, and beginners are usually better at the lower end. The reason is losing-streak math: at 1% risk, ten straight losses cost about 9.6% of the account; at 10% risk the same streak costs about 65% and requires a near-tripling just to recover.
Why does my position size need a stop-loss to be calculated?
Because risk is defined by how far the price can go against you before you exit. Without a stop-loss there is no defined exit, so the loss is unbounded and no position size can cap it. If a trade idea has no invalidation level, it cannot be sized — which is itself a reason to skip it.