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About Position Math
Free calculators for manual trading and account-math estimates in your browser — no login or broker connection. Optional email registration is separate.
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. Manual calculation forms run in your browser; the market-data scanner uses a server.
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. Manual calculation inputs stay in your browser unless you put them in a share URL. The pairs-trading scanner uses a server and delayed, cached daily market data, not a live feed. Optional email forms save a registration; see the privacy details. 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 publishes these calculators under the site's name. How methods are documented and how to report a calculation issue are described 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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Optional; calculators need no email. The form saves your email, submission time, source page and language. Submitting does not send an immediate email.