Stock Position Size Calculator
Shares to buy from your risk-per-trade and stop distance — the position sizing that keeps any single loss survivable.
Formula
Size from the stop, not from conviction: tight stops allow bigger positions, wide stops force smaller ones, and the loss if wrong is identical either way — 1% of the account. Twenty consecutive losers (it happens) costs 18%, not ruin. This formula is the whole game of trading survival.
Not financial advice — for informational and analytical use only. Verify all figures with a qualified professional before acting on them.
Need stock position size calculator results fast? Analysts, founders, traders and finance professionals use the Stock Position Size Calculator to skip the spreadsheet and get a defensible answer in one step — free, private and instant.
About Stock Position Size Calculator
Shares to buy from your risk-per-trade and stop distance — the position sizing that keeps any single loss survivable. Size from the stop, not from conviction: tight stops allow bigger positions, wide stops force smaller ones, and the loss if wrong is identical either way — 1% of the account. Twenty consecutive losers (it happens) costs 18%, not ruin. This formula is the whole game of trading survival. The governing relationship is shares = (account × risk%) / (entry − stop). The Stock Position Size Calculator computes entirely in your browser — free, private (your figures never leave your device) and instant, recalculating live as you change any input.
How to use Stock Position Size Calculator
- 1Enter Account size (currency), Risk per trade (%), Entry price (currency), Stop-loss price (currency) into the Stock Position Size Calculator.
- 2The result is computed automatically using shares = (account × risk%) / (entry − stop) — there is no button to press.
- 3Change any input to model a different scenario, then copy or share the result.
Why use Stock Position Size Calculator?
- ✓Computes stock position size calculator instantly with the correct formula — no spreadsheet needed
- ✓100% free and unlimited, with no sign-up, login or paywall
- ✓Runs entirely in your browser, so the figures you enter stay private
- ✓Shows the formula, a live worked example and references so you can defend the number
Frequently asked questions
What is the formula behind the Stock Position Size Calculator?+
Stock Position Size Calculator uses shares = (account × risk%) / (entry − stop). Size from the stop, not from conviction: tight stops allow bigger positions, wide stops force smaller ones, and the loss if wrong is identical either way — 1% of the account. The tool substitutes your actual inputs into this relationship and shows the worked example step by step.
What inputs does the Stock Position Size Calculator need?+
Enter Account size (currency), Risk per trade (%), Entry price (currency), Stop-loss price (currency) and the result updates immediately — there is no button to press. Change any value to model a different scenario in real time.
Is the Stock Position Size Calculator free, and is my data private?+
Yes — it is completely free with no sign-up or usage limit, and it runs entirely in your browser, so the numbers you enter are never uploaded or stored on any server. It is for informational and analytical use, not financial advice.
What should I watch out for when using the Stock Position Size Calculator?+
Twenty consecutive losers (it happens) costs 18%, not ruin. This formula is the whole game of trading survival.
What is the Stock Position Size Calculator based on?+
The method follows authoritative sources: Van Tharp — position sizing; risk-of-ruin tables. The formula and references are shown on the page so you can verify and cite the result.
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