The standardized trade size in forex. In retail trading, 1 standard lot is typically 100,000 units of the base currency. There are also mini lots (0.1 standard, or 10,000 units) and micro lots (0.01 standard, or 1,000 units) for smaller trade sizes. Position sizes are often discussed in lot terms (e.g. “2 lots” means 200,000 units if standard lots).