RISK • STOP LOSS • POSITION SIZE

Position Size Calculator

Calculate trade size based on risk, stop loss and maximum loss.

Engine activeMarket dataInstant calculation

Position value$0

Position units0

Maximum loss$0

Stop distance0%

Required margin$0

Estimated fees$0

Potential profit$0

Risk / Reward—

Capital exposure0%

Slippage allowance

Risk budget used0%

What this sizing means

Trade map

Visualize entry, stop loss and take profit.

Trade summary

The main values you need before opening a position.

Capital at risk$0

Entry price$0

Stop loss$0

Take profit (optional)$0

Position units0

Position value$0

NEXT STEP

Continue from position sizing to liquidation risk.

Carry the current direction, entry, leverage and position size into the next tool automatically.

Position SizeDefine risk and size

→

Liquidation PriceUse these trade inputs

→

Futures PnLEvaluate this scenario

→

Risk of RuinStress-test repeated risk

Important: This tool helps size risk. It does not account for slippage, gaps, liquidations or fast price changes and is not financial advice.

Method, example and assumptions

Example: with a $10,000 account, 1% risk, entry at $100 and stop at $95, the initial risk budget is $100. When fees or slippage are included, the calculator reduces units so modeled stop loss plus costs stays within that budget.

Core method: units = risk budget ÷ (stop distance per unit + modeled costs per unit). Quantity-step rounding is always downward so rounding cannot increase modeled risk.

Position sizing controls exposure; it does not predict whether a trade will succeed. Method reviewed August 21, 2026.

How to use a position size calculator

A position size calculator works backward from the loss you are willing to accept. Enter account balance, define risk per trade, set entry and stop-loss prices, and FinanceTools calculates the number of units that keeps the modeled stop loss inside that risk budget. This is useful for crypto, stocks and other instruments where position size can be expressed in units.

Position sizing does not tell you whether a trade is good. It helps make the exposure consistent with a predefined risk limit. Fees, slippage, gaps and stop execution can make the real loss larger than the model.

Frequently asked questions

What is position size in trading?

Position size is the number of units, shares or contracts used in a trade. Risk-based sizing links that quantity to account size and the distance between entry and stop loss.

How much should I risk per trade?

That is a personal risk decision, not a universal number. The calculator lets you compare different percentages so you can see how sizing and maximum loss change.

Does leverage increase the allowed risk?

No. Leverage changes required margin and capital efficiency. A risk budget should still be defined from the loss you are prepared to accept at the stop.

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