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Position Size Calculator

Finance & Investment

2% rule · stop-loss based sizing

Quick Answer

Position Size Calculator: 2% rule · stop-loss based sizing. Position Size Calculator uses standard finance formulas to compute accurate results instantly.

%
Position size
1,428 shares
Position value 17,850 · 17.8% of account
Max loss (hit stop)¥1,000
Risk per share¥0.70
Position weight17.8%
Profit at 3R target¥2,999

Risk level comparison

Risk %SharesPosition valueMax loss
0.5%7148,925500
1%1,42817,8501,000
1.5%2,14226,7751,499
2%2,85735,7132,000
3%4,28553,5632,999
The 2% rule: never risk more than 2% of equity on one trade. At 2% risk, 10 consecutive losses still leave 0.98¹⁰ ≈ 81.7% of your capital intact — survivable. Position sizing is what separates risk management from gambling: the stop-loss defines the size, not the other way around.

Calculation steps

  1. 1Risk amount = 100,000 × 1% = 1000.00
  2. 2Risk per share = entry − stop = 12.5 − 11.8 = 0.7000
  3. 3Shares = ⌊1000.00 ÷ 0.7000⌋ = 1428
  4. 4Position value = 1428 × 12.5 = 17850.00 (17.8% of account)

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How to Use

  1. Enter amounts and terms: fill principal, rate and period in the Position Size Calculator (defaults work for a quick try).
  2. Instant results: key figures and cost breakdown update live as you type.
  3. Compare scenarios: tweak any parameter to compare costs and returns across plans.
  4. Copy key numbers: one-click copy for records or sharing with your advisor.

Key Points

  • Position Size Calculator is a free online finance tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: 2% rule · stop-loss based sizing.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Position Size Calculator formula

Position Size Calculator uses standard finance formulas to compute accurate results instantly.

FAQ

How do I use the Position Size Calculator?
Open the page and fill in the input fields — results update automatically. 2% rule · stop-loss based sizing.
Are the results accurate?
Yes. Standard financial formulas and published rate data are used. For official figures, consult your financial institution.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Can I use the results for financial decisions?
Results are for reference. Consult a licensed financial advisor before major decisions.
Does it work on mobile?
Yes. Fully responsive on phones, tablets and desktops.

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Source & Updates

Based on published rate tables and standard financial formulas. Last updated: 2025-07

Authoritative sources:

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Position Size Calculator[EB/OL]. https://www.yijiansuan.com/en/c/finance/position-size

Results provided by this tool are for reference only and do not constitute professional advice.