Position Sizer

Start with the risk. Work back to the position.

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Build your plan

Editable assumptions

Entry price ($)

Stop-loss price ($)

Planned risk ($)

Total cost buffer (%)

Your combined fee and slippage assumption, as a percentage of entry notional. This is not a quoted venue fee.

Planning leverage

Leverage changes the margin estimate, not the risk-sized quantity. This planner does not submit an order.

Your calculated size

Long scenario

Position notional$1,190.48

0.47619 asset units

Margin estimate$396.83

Stop distance4.00%

Loss at stop, before costs$47.62

Cost buffer$2.38

Total planned risk$50.00

Price move to stopCost buffer

A budget, not a promise

Planned risk is not a maximum-loss guarantee. Entry fills, gaps, slippage, fees, funding or liquidation can increase losses; a stop may not fill. Size is rounded down to six asset decimals, and venue size rules may reduce it further.

Asset units = risk budget ÷ (entry-to-stop distance + entry price × total cost buffer). Margin is notional divided by leverage; this estimate excludes venue maintenance margin and existing positions. Funding is not modeled separately.

In the perp order form, choose Risk budget to size from the current reference or limit entry and your stop. Review the order before sending.

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