In retail forex, a lot is a bundled unit of position size. Traditionally, one standard lot was associated with 100,000 units of base currency in many educational models, while mini and micro lots represent smaller bundles.
Why your broker sheet still wins
Brokers can map “1.00 lot” to different contract definitions on CFD-style products. Before trusting any third-party tool, compare its assumptions to your platform’s contract specification for the symbol you trade.
Lots and pip value move together
Doubling lot size (all else equal) doubles the account impact per pip. That is why position sizing usually starts from risk budget and stop distance, not from a “feeling” about lot buttons.
Try the position size calculator after you know your stop in pips and acceptable risk percent.
Translating “lots” into questions you can answer
Instead of memorizing labels, ask: How many units of base currency does one increment of my lot button represent? and How does my broker map that to notional exposure and margin? Once those two answers are clear, pip value and margin calculators become cross-checks instead of guesswork.
Why prop desks standardize vocabulary
Teams that mix “contracts,” “lots,” and “units” without a sheet lose time on every dispute about P&L. A one-page spec per symbol class—mini FX, micro FX, metals, indices—pays for itself quickly.
- Store broker contract PDFs or screenshots in one folder.
- Mirror the same naming in your journal CSV headers.
- Revisit specs after platform upgrades.
Practical next step
Pick your three most-traded symbols and write their contract summaries in your own words. You will spot ambiguities faster than by rereading marketing pages alone.