The standard unit of trade size in forex — a standard lot is 100,000 units of the base currency.
A lot is the size of your forex position. There are three common lot sizes: standard (100,000 units), mini (10,000 units), and micro (1,000 units). On EUR/USD, one standard lot means you're controlling 100,000 euros.
Lot size determines the dollar value of every pip move. On a standard lot of EUR/USD, one pip is worth about $10. On a mini lot, about $1. On a micro lot, about $0.10. The smaller the lot, the smaller the P&L swings — and the smaller the emotional rollercoaster.
Beginners should start on micro lots. The whole point of risking tiny amounts isn't to make tiny profits — it's to prove to yourself you can follow your rules without the dollar numbers hijacking your brain.
Real trade example
Risking $50 per trade on a $5,000 account with a 25-pip stop on EUR/USD means trading 0.20 lots (2 mini lots) — not 1 standard lot, which would risk $250.
Frequently asked about lot
What is a lot in trading?+
The standard unit of trade size in forex — a standard lot is 100,000 units of the base currency.
When will I see lot used in real trading?+
Every time you open a trade. The "volume" or "size" box on your broker is asking you in lots (0.01 = micro, 0.1 = mini, 1.0 = standard).
What is the most common mistake traders make with lot?+
Jumping from micro lots straight to standard lots because "I'm profitable now." Going 100x on size changes your nervous system instantly — winners feel terrifying, losers feel like the end of the world. Scale up in 2x steps, not 100x.
What do experienced traders know about lot that beginners don't?+
Never pick a lot size off vibes. Use a position size calculator: (account risk $) ÷ (stop distance in pips × pip value). Let the math pick the lot for you every single trade.