Understand the five inputs
Open the position size tool and choose Long or Short. Account balance and prices are expressed in USD; price is per asset unit. Account risk is a percentage, so entering 1 means 1%, not 0.01%. All example settings in this guide are hypothetical.
The tool does not connect to your account or fetch a live market price. Type the values you want to model and make sure the account definition is consistent. It calculates while you type; there is no trade submission or order-execution button.
Evidence: CryptoTrades calculator implementation
Reproduce the worked example
Choose Long, then enter an account balance of 10000, account risk of 1, entry price of 100 and stop-loss price of 95. The model produces a $100 risk budget, $5 entry-to-stop distance, 20 units and $2,000 of notional exposure.
Check it independently: 10000 × 1 / 100 = 100; 100 / |100 − 95| = 20; 20 × 100 = 2000. Displayed values are rounded for readability. Minimum order sizes, permitted precision and actual exchange eligibility are not checked.
Evidence: CryptoTrades calculator implementation
Check direction before interpreting the result
For a short example, keep the account, risk and entry unchanged but set the stop above entry, such as $105. The absolute distance is again $5 and the same formula returns 20 units. This symmetry does not mean the two positions have identical practical risks.
A short can involve borrowing, margin and losses beyond an initial deposit. The tool does not calculate borrowing availability, liquidation price or margin requirements. Changing the direction describes the modeled price movement; it does not enable a short position.
Resolve invalid inputs rather than bypassing them
Blank or non-finite values cannot produce a meaningful estimate. Account balance, entry and stop must be positive, and account risk must be between 0.01% and 100% in the current implementation. Those bounds are software validation limits, not suggested risk settings.
For a long, the stop must be below entry. For a short, it must be above entry. A zero distance is rejected. If the calculated notional exceeds the account balance, the tool shows a warning rather than imposing an automatic cash-only cap.
Evidence: CryptoTrades calculator implementation
Change one assumption at a time
From the original long example, moving the stop to $98 changes the distance to $2 and the calculated position to 50 units. Keep a note of the changed input so that a larger output is not mistaken for an improved scenario.
Ask what would happen if execution were worse than the modeled stop. Include costs in your separate review and read the trading-fee guide. This calculator does not add fees to its risk budget, simulate a stop order or validate market liquidity.
Keep your own scenario notes
The calculation runs in your browser. It does not save a trading journal, connect an exchange or create a portfolio holding. Record any hypothetical scenario you want to retain in a file you control.
If you report a problem, share a reproducible hypothetical example and the validation message. Do not send account credentials, balances tied to your identity, wallet secrets or other private financial records.
Sources & method
- CryptoTrades calculator implementation
Checked against the current calculator formula and validation rules. This is a planning model, not execution research. Checked 2026-10-28.
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Found an error? Contact the editorial team with the page and supporting source. Never send private account information.