Risk · Core

Position Size Calculator

Separate the maximum risk budget from the modeled stop loss, position value, gross exposure and cash or borrowing constraint.

EXPLORE THE ASSUMPTIONS

Load a worked example, then change any input. Example B changes one assumption from A. These are teaching examples, not forecasts.

Scenario A

03 · RISK CONTROL

Position Size

How to use it: Enter your account value, the percentage you are willing to risk, your planned buy price and your stop price. It estimates how many shares keep the possible loss near your chosen limit. Example: 1% of a $25,000 account is $250; with $3 at risk per share, the estimate is 83 shares.

Financing assumption
Estimated share count83 shares
Maximum risk budget$250.00
Modeled loss at the entered stop$249.00
Position value$4,150.00
Gross exposure / account equity16.6%

What this result meansThe risk budget is a ceiling, not the expected loss. The modeled stop loss is shares × stop distance; the position value is separate and may be limited by available capital. Gaps and slippage can make the actual loss larger.

How to use this calculator

Separate the maximum risk budget from the modeled stop loss, position value, gross exposure and cash or borrowing constraint. Change one assumption at a time, compare the result and consider what the formula leaves out.

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Formula and assumptions

Risk-based shares = floor(risk budget ÷ risk per share); cash-only shares = the smaller of risk-based shares and floor(available capital ÷ entry price). Results are simplified illustrations and may exclude taxes, changing rates, liquidity, spreads, market impact, assignment, broker rules or other real-world factors.

Common questions

Does this calculator use live market data?

No. Every value comes from the assumptions you enter. A ticker symbol, when shown, is only a label.

Can I make a trade based on this result?

The result is an educational illustration, not a recommendation or a complete analysis. Verify current facts, account rules, costs and risks independently.

Why might the actual result be different?

Real outcomes can be affected by execution price, spread, slippage, fees, taxes, liquidity, volatility, financing costs, corporate actions and changing market conditions.

Educational illustration only. This calculator does not use live market data and does not provide investment, trading, tax or legal advice. Verify formulas, rules, fees and product details with current primary sources and regulated providers before acting.

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