What is Lot Size?
Updated October 17, 2026
Lot size is how big your trade is, measured in units of the base currency.
When you place a trade you pick a lot size. Bigger lots mean each pip is worth more money, both up and down.
A standard lot is 100,000 units, a mini lot is 10,000 and a micro lot is 1,000. Most beginners should start tiny.
Your lot size is the main dial for risk. Even a great setup can wreck an account if the lot is too big for the balance.
Example
With $500 in your account, trading 0.01 lots means a 20 pip loss costs about $2 instead of $200 on a full lot.
Questions people ask
What lot size should a beginner use?
Usually micro lots like 0.01, sized so one losing trade costs a small slice of your account.
Do trading bots pick lot size for me?
Many do, based on settings you choose. Always check those settings because aggressive sizing is where bots blow accounts.
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More questions people ask
What is lot size in forex?
Lot size is just the term for how many currency units you're buying or selling in a single trade. A standard lot is 100,000 units of the base currency, but you can trade smaller sizes like a mini lot (10,000) or a micro lot (1,000). Picking the right lot size matters a lot since it controls how much you can make or lose on a trade, and trading always carries the risk of losing money.
What does lot size mean?
Lot size just means the amount of an asset you're buying or selling in one trade, like 100,000 units of currency for a standard forex lot. The bigger the lot size, the bigger your potential profit or loss on that trade.
Can you explain lot size in simple terms?
Lot size is the standard unit of measurement for how big a trade is. In forex that usually means currency units (a standard lot is 100,000 units), but the same idea applies anywhere you trade, it's simply the quantity you're buying or selling in one go.
What is lot size in trading?
Lot size is the fixed amount of an asset included in one trade, whether that's currency units in forex, shares in stocks, or contracts in futures. It's the unit that decides how big your position is and how much each price move is worth to you.
How do you calculate lot size?
Most traders work it out from three things: their account balance, how much they're willing to risk on the trade (often 1 to 2 percent), and the stop loss distance in pips. Divide your risk amount by the stop loss distance and then by the pip value, and that gives you the lot size for that trade.
How do you find the right lot size for a trade?
You find it by working backward from your risk tolerance: decide how much money you're okay losing on the trade, figure out your stop loss distance, then use those numbers (adjusted for pip value) to land on a lot size. A lot size calculator can do this math for you in seconds if you'd rather not do it by hand.
What is a lot size calculator and how do I use one?
A lot size calculator is a free tool where you enter your account balance, risk percentage, and stop loss in pips, and it tells you what lot size to use for that trade. It takes the guesswork out of position sizing, which is one of the more important parts of managing risk in trading.
How much is a 0.01 lot size?
A 0.01 lot is a micro lot, which equals 1,000 units of the base currency, the smallest size most brokers allow. For a pair like EUR/USD that usually works out to around 10 cents per pip, which makes it a popular starting point for beginners who want to keep risk small while they learn.
How much lot size should I use?
There's no single right answer, it depends on your account size, how much you're comfortable risking per trade, and your stop loss distance. A common rule beginners follow is risking no more than 1 to 2 percent of their account on any one trade and sizing the lot to match. Keep in mind trading always carries the risk of losing money, so start small while you're learning.
How do you calculate lot size for gold trading?
Gold uses a different pip value than regular currency pairs, so you calculate lot size the same way, risk amount divided by stop loss divided by pip value, just using gold's specific pip value in the formula. Most lot size calculators have a gold option built in so you don't have to work out the pip value by hand.
How do you calculate lot size for NAS100?
For an index like NAS100, you size your position based on your risk amount, your stop loss in points, and the dollar value per point for that instrument, which your broker lists in its contract specs. A lot size calculator that supports indices can work this out for you instantly.
How do you calculate lot size in futures trading?
For futures, lot size calculation uses the contract size and tick value instead of pips, but the idea is the same: figure out how much you're willing to risk, divide by your stop loss distance, and divide again by the dollar value per tick to get the number of contracts. Check your broker's contract specs since tick value varies a lot between futures markets, and remember futures trading can lose money fast if a position moves against you.