Forex Lot Size Explained: How Much Should You Trade?
Lot size determines how much market exposure each trade carries. Learn standard, mini, and micro lots and why sizing should follow your risk plan.
Forex lot size defines how much of the base currency you control per trade. It is the bridge between your account balance and market exposure — and the first number to set after your stop distance and risk percentage.
This guide explains standard, mini, and micro lots with practical context. For automated math, use the FXTopic lot size calculator.
Lot definitions
Standard lot
Commonly 100,000 units of the base currency in FX pairs quoted as XXX/YYY. Pip value on majors like EURUSD is often near $10 per pip per standard lot when the account is USD and quote currency is USD — but verify for your pair and account currency.
Mini and micro lots
Mini lot: often 10,000 units (0.1 standard).
Micro lot: often 1,000 units (0.01 standard).
Brokers may allow smaller steps. Always read the contract specification sheet.
Why lot size matters for risk
Two traders with the same stop distance in pips can lose different amounts if lots differ. Lot size should follow a written risk plan — see how to calculate position size and pips and pip value.
Simple illustration
If you risk 1% of a $10,000 account ($100) and your stop is 20 pips with $10 pip value per standard lot, a full standard lot risks about $200 — too large. The correct lot is closer to 0.5 standard under those simplified assumptions.
Gold and other instruments
XAUUSD uses different contract sizes. Do not copy FX lot habits — read XAUUSD lot size and risk.
Key takeaways
Lots translate account risk into market exposure.
Micro lots help beginners practice with smaller notional values.
Always confirm contract size with your broker.
Use the lot size calculator to check arithmetic.
Risks and common mistakes
Maxing available leverage instead of planned risk.
Confusing units with lots on partial fills.