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About Position Math
A free set of trading and account-math calculators that run entirely in your browser — no login, no broker connection, nothing stored.
What this site is
Position Math is a collection of free calculators for the numbers traders and funded-account (prop-firm) traders actually look up every day: how big a position to take, what gain reverses a loss, where a stop or target sits, crypto profit and liquidation price, and the prop-firm rules people most often fail. Every tool runs as plain arithmetic in your browser.
How it's built
Each calculator is deterministic: the result is arithmetic (for the prop-firm simulator, a probability estimate) computed from the numbers you type. There is no account connection and nothing is uploaded or stored. The pairs-trading scanner is the one exception that uses market data — delayed, cached daily figures refreshed once a day, never a live feed. Methodology and assumptions are written out on each tool's own page.
Who it's for
Retail traders and people running funded / prop-firm challenge accounts who want a fast, honest number without handing over an email or connecting a broker. The site is bilingual (English and 中文).
Who builds it
Position Math is built and maintained by a small team working in proprietary trading and quantitative engineering. How the math gets checked, and why the site carries a team signature instead of bylines, is written up on the team page.
Not financial advice
Everything here is an information and education tool. Nothing on Position Math is investment, trading, tax, or financial advice, and no result is a recommendation to trade. See our risk disclaimer and affiliate disclosure. Questions or a mistake to report? [email protected].
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