Position Size Calculator
Convert a fixed risk percentage and stop distance into position units and notional exposure.
Outputs are educational estimates only — not investment, tax, or legal advice.
About this tool
Context, privacy, and common questions—meant to be read alongside the step-by-step guide below.
Enter account equity, the risk per trade as a percent of equity, your entry price, and your stop-loss price. The tool divides dollar risk by per-unit risk (distance from entry to stop) to estimate how many shares or units fit your risk budget.
This is a planning aid only: it does not include commissions, slippage, or margin rules.
How to use Position Size Calculator
Use the sections below from top to bottom — they match the order of the controls on this page.
- Decide which currency or unit convention you are using and keep every field in that convention.
- Gather source figures (statements, platform specs, broker tick sizes) instead of guessing when precision matters.
- Note whether percentages are entered as whole numbers (e.g. 8 for 8%) as the form expects.
- Open Position Size Calculator and read the short description so you know what each output represents.
- Enter every required field; use optional fields only when you understand how they change the model.
- Click Calculate (or the main action) and read all outputs, not only the headline number.
- Change one assumption at a time to see sensitivity (rates, growth, stop distance, share count, etc.).
- Copy or jot down results if you are moving the numbers into a spreadsheet or memo.
- Clear the form when you switch to a different ticker, scenario, or reporting period.
Rounded figures are for display—re-run with raw inputs in your own models when stakes are high.
DCF-style tools are simplified teaching layouts; real valuations need capital structure, working capital, and cross-checks.
- “Invalid” or empty results: check for divide-by-zero cases (zero shares, zero volatility, stop equal to entry, etc.).
- Surprising ratios: confirm whether you entered annual vs monthly rates, or percent vs decimal.
- Displayed decimals are rounded; internal math may keep more precision.
- Simplified DCF, Sharpe, or pivot models omit fees, slippage, seasonality, and corporate actions—treat them as sketches.
- Market data on public pages may be delayed; always verify quotes and corporate actions at the source.
On a shared computer, close this tab. Bookmark the page if you will need it again, and save anything important to your own device or notes.
- Outputs are educational estimates, not investment recommendations or tax guidance.
- Leverage, margin, and regulatory limits depend on your broker and region—verify outside this browser tool.
- Past performance, backtests, and simple ratios do not guarantee future results.
- Do not rely on this page alone for leverage, margin, or compliance decisions.