What is a lot in forex trading?
In one line: A lot is a standard trade size in forex. One standard lot is 100,000 units of the base currency; mini and micro lots are smaller.
The three common sizes
| Lot | Units | About $ per Pip on EUR/USD |
|---|---|---|
| Standard | 100,000 | $10 |
| Mini | 10,000 | $1 |
| Micro | 1,000 | $0.10 |
Most platforms let you enter decimals. 0.10 lots is one mini lot. 0.01 lots is one micro lot.
A simple example
You have a $2,000 practice account and risk 1%, which is $20. Your Stop loss on EUR/USD is 25 pips away.
$20 ÷ 25 pips = $0.80 per pip. A micro lot is $0.10 a pip, so that's 8 micro lots, or 0.08 lots. If the stop is hit, you lose about $20. The lot size calculator does this in one step.
Why it matters
The lot size is the dial that sets how much each pip costs you. Get it right and every trade risks the same slice of your account. Get it wrong and one trade can cost ten times what you planned.
That's also why lot size should come last. First the chart tells you where the stop goes. Then your risk amount tells you how big to be. More in how much to risk per trade.
A common mistake
Picking a lot size out of habit. "I always trade 1 lot" means a 10-pip stop risks about $100 and a 50-pip stop risks about $500. The risk changes every trade while the size stays the same.
Flip it. Keep the dollar risk fixed and let the lot size change with the stop. Wide stop, small lot. Tight stop, bigger lot. This is the same idea as Position size in stocks.
Brand new? Micro lots let you trade real, tiny sizes after paper trading, so mistakes stay cheap while you learn.
Questions
How much money do I need to trade one lot?
It depends on Leverage. In the US, retail leverage on major pairs is capped at 50:1, so one standard lot of EUR/USD needs roughly $2,000 or more set aside as Margin. But margin is not your risk; your stop is.
What is 0.01 lot?
One micro lot, 1,000 units. On EUR/USD a pip is worth about $0.10.
Is a bigger lot better?
No. A bigger lot just makes every pip cost more. The right size is the one where hitting your stop costs your planned risk.
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