Interactive lab · 07

Position size calculation

Decide, up front, the maximum loss you are willing to accept per trade, then back‑solve position size from entry and stop levels. This is a risk‑budgeting tool, not a buy/sell signal.

Account assets（元）Single‑trade risk cap (%)Planned entry priceFailure/stop‑loss priceTrading cost per share (元)

Risk budget

Single trade risk budget

—

Loss tolerance—

Risk per share—

Nominal position—

Actual positions should also be constrained by liquidity, concentration, gap risk, financing and investment policy limits; if a stop‑loss price does not represent a true thesis invalidation, the calculation creates a false sense of precision.

How to use this finance tool

This page turns a finance concept into checkable inputs, formulas, and scenarios. Read the variable definitions first, then compare conservative, base, and stress cases; one result is not a promise of return.

Suggested workflow: confirm units and time periods, enter your own assumptions, then review sensitivity, costs, and downside cases.

Limitations: the model does not forecast markets and may not include every tax, slippage, liquidity, credit, regulatory, or contract term. Verify important decisions with current primary information and a qualified professional.

Financial risk disclaimer

This page, its calculators, and examples are for education, research, and scenario estimation only. They are not personalized investment, trading, betting, tax, legal, or financial advice. Markets and local rules can change quickly; verify current primary information and take responsibility for your decisions. Past performance, model outputs, and simulations do not guarantee future results.