A lot in forex trading is the standardized size of a trade—the number of currency units you are buying or selling. Lot size directly determines how much profit or loss you can make on any price move.
Types of lots
There are three standard lot sizes:
- Standard lot: 100,000 units of the base currency
- Mini lot: 10,000 units of the base currency
- Micro lot: 1,000 units of the base currency
Each type scales proportionally. A standard lot is 10 times larger than a mini lot, which is 10 times larger than a micro lot.
How lot size affects risk and reward
Lot size determines the pip value—the monetary value of a single pip move. In a standard lot, one pip typically equals $10. In a mini lot, it's $1. In a micro lot, it's $0.10. This relationship is fixed and scales with the lot size.
If the market moves 50 pips against your position, the loss on a standard lot is $500, on a mini lot is $50, and on a micro lot is $5. This demonstrates why lot size is the primary lever controlling risk per trade.
Choosing the right lot size
Larger lots expose your account to greater risk relative to your capital. Trading a standard lot on a small account can require a large share of that account's capital as margin, leaving little room for drawdown and increasing liquidation risk.
Many professional traders cap the risk on any single trade to a small percentage of their account, sizing the lot accordingly rather than trading a fixed size regardless of account balance. Beginners typically trade micro or mini lots while learning; larger lots are only justified with experience and proven strategy results.
