Crypto Position Size Calculator
Crypto Position Size Calculator estimates how many units fit a stated loss budget when entry and stop prices are known. It divides the chosen account-risk amount by the absolute price distance to the stop. The result is a planning quantity, not a guarantee: slippage, gaps, liquidation mechanics, fees, funding, and execution failures can make the realized loss larger.
Runs locally — files stay on your deviceHow is crypto position size calculated?
First find the amount you are willing to lose, then divide it by the price distance between entry and stop.
Formula: Position size = (account balance × risk %) ÷ |entry − stop|
Position sizing starts with loss budget and stop distance
If balance is B, risk fraction is r, entry is E, and stop is S, the planned loss budget is B × r and unit risk is |E − S|. Quantity is B × r ÷ |E − S|. Multiplying quantity by entry estimates position value, which can exceed cash balance when leverage is assumed.
How it works
Enter the account balance used for this risk decision, the percentage you are prepared to lose in the scenario, and prices for entry and protective stop. Review both the estimated quantity and notional value, then reduce size when fees, slippage, leverage limits, or exchange precision matter.
Key concepts
Wider stops produce smaller quantities
For the same loss budget, doubling the entry-to-stop distance halves the calculated quantity.
Notional value and money at risk differ
Position value is quantity × entry. Planned risk is quantity × stop distance; leverage can make notional value much larger than account equity.
When to use it
- Compare position sizes for different stop distances.
- Translate a fixed account-risk percentage into an estimated quantity.
- Check whether a proposed trade's notional value fits available capital and venue rules.
When not to use it
- Do not assume a stop order guarantees its trigger price.
- Do not use the result without considering fees, slippage, funding, and liquidation.
- Do not enter a seed phrase, private key, wallet address, or exchange credential.
Worked examples
One-percent risk
- Input
Balance 10,000; risk 1%; entry 50; stop 48- Expected output
Loss budget 100; quantity 50 units; notional 2,500
Each unit risks 2, so fifty units represent 100 before costs.
Wider stop
- Input
Same balance and risk; entry 50; stop 45- Expected output
20 units
Each unit now risks 5, so the quantity falls.
Entry equals stop
- Input
Entry 50; stop 50- Expected output
Undefined position size
Division by a zero stop distance cannot produce a meaningful quantity.
Common mistakes
Sizing from notional value alone
A large or small position value does not state the planned loss at the stop. Correction: Base quantity on loss budget and stop distance.
Ignoring execution costs
Fees and slippage add to the theoretical price loss. Correction: Reserve part of the loss budget for realistic costs.
Treating the stop as guaranteed
Fast markets can fill beyond the trigger or fail under venue conditions. Correction: Use conservative size and understand the order type and venue.
Best practices
- Model adverse slippage and fees before deciding quantity.
- Check minimum order size, quantity step, margin, and liquidation rules.
- Use a loss budget you can actually tolerate.
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Limitations and privacy
- No live prices, volatility, order-book depth, fees, funding, margin, or liquidation data is included.
- This is a mathematical scenario, not investment advice. Prices can gap, orders can slip, fees can change, and losses can exceed a planned amount.
- The formula assumes one entry and one stop and does not model partial fills or scaling.
Trade inputs are calculated locally in this browser. Toolbox does not connect to an exchange or wallet.
Frequently asked questions
Why does a tighter stop increase position size?
Each unit has a smaller modeled price loss, so more units fit the same loss budget; execution noise can still make an overly tight stop risky.
Does the result include trading fees?
No. Reduce quantity or loss budget to allow for fees and slippage.
Can position value exceed account balance?
The mathematical notional can, which implies leverage; availability and risk depend on venue rules.
Does a stop guarantee the calculated maximum loss?
No. Gaps, slippage, liquidity, and order failures can produce a larger loss.
Does Toolbox connect to my exchange?
No. It uses only the values entered locally.