What is a lot in forex trading?
Written by an ex-institutional trader. What a lot is, the difference between standard, mini, micro and nano lots, how lot size sets your pip value and your risk, and how to choose the right size for your account.
Direct answer
A lot in forex is the unit of position size. One standard lot is 100,000 units of the base currency, and smaller lots scale down from there: a mini lot is 10,000 units, a micro lot is 1,000, and a nano lot is 100. Lot size is how you set how big a trade is, and it directly determines what each pip is worth: one pip is about USD 10 on a standard lot, USD 1 on a mini, and USD 0.10 on a micro.
Choosing the right lot size is the core of position sizing and risk control. The bigger the lot, the more each pip move is worth, in both directions. Most beginners trade too large because they pick a lot size first and discover the risk second. The correct approach is the reverse: decide how much you are willing to lose on the trade, then choose the lot size that matches, which the position size calculator does for you.
What a lot is
A lot is the unit forex positions are measured in. Rather than saying you bought 73,500 euros of EUR/USD, traders express position size in lots. One standard lot is 100,000 units of the base currency, the first currency in the pair, so one standard lot of EUR/USD is 100,000 euros of exposure.
The lot is simply a convenient package size. Because 100,000 units is a large position for most retail accounts, brokers offer fractions of it, which is what makes forex accessible to a small account: you can take a position that is a sensible size relative to your balance rather than being forced into a six-figure trade.
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Standard, mini, micro and nano lots
There are four common lot sizes, each one tenth of the one above:
| Lot type | Units | Lot size | Pip value (USD) |
|---|---|---|---|
| Standard | 100,000 | 1.0 | ~USD 10 |
| Mini | 10,000 | 0.1 | ~USD 1 |
| Micro | 1,000 | 0.01 | ~USD 0.10 |
| Nano | 100 | 0.001 | ~USD 0.01 |
Most platforms express size in the standard-lot column, so 0.1 lots means a mini lot and 0.01 lots means a micro lot. You are not limited to these round numbers either: brokers let you trade in steps of 0.01 lots, so you can hold 0.37 lots if that is the size your risk calls for. Nano lots are less widely offered, but micro lots are nearly universal and are the right starting point for a small or new account.
How lot size sets pip value
The reason lot size matters so much is that it sets your pip value, the dollar worth of each pip of movement, and pip value is what turns price moves into money.
On a USD-quoted pair, one pip is worth about USD 10 on a standard lot, USD 1 on a mini, and USD 0.10 on a micro. So a 50-pip winning trade makes about USD 500 on a standard lot, USD 50 on a mini, and USD 5 on a micro. The same 50-pip move against you loses the same amounts. Double the lot size and you double the value of every pip, in both directions.
This is the key insight: lot size, not leverage, is the real control on how much you are risking in dollar terms. Two traders can use the same 30:1 leverage but take wildly different risk if one trades a standard lot and the other a micro lot. When people say a trade was too big, they almost always mean the lot size was too large for the account.
How to choose a lot size
The right way to choose a lot size is to work backwards from risk, not forwards from a round number.
- Decide your risk per trade. A common rule is to risk no more than 1 to 2 percent of your account on any single trade. On a AUD 5,000 account at 1 percent, that is AUD 50.
- Find your stop distance in pips. Based on your strategy, decide where the stop loss sits, say 25 pips away.
- Size the lot to match. Choose the lot size so that the stop distance times the pip value equals your risk. AUD 50 of risk over a 25-pip stop means about AUD 2 per pip, which is a bit over a mini lot.
Doing this by hand is fiddly, especially with the AUD conversion, which is exactly what the position size calculator is for: enter your account balance, risk percentage and stop distance, and it returns the lot size in seconds. Choosing lot size this way is the difference between controlled risk and the common beginner pattern of picking a round lot, trading too large, and being surprised by the loss.
The companion basics, what is a pip, what is the spread, what is leverage and what is margin, complete the foundation, and the best forex brokers in Australia ranking covers brokers that support micro lots for sensible sizing.
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Examples use indicative figures for illustration and are not financial advice. Last reviewed: 2026-06-01.
Frequently asked questions
What is a lot in forex?
A lot is the standard unit of position size in forex. One standard lot is 100,000 units of the base currency of the pair. Brokers also offer smaller increments: a mini lot is 10,000 units, a micro lot is 1,000, and a nano lot is 100. The lot size you choose sets how large your position is, and therefore how much each pip of price movement is worth to you.
How big is a standard lot?
A standard lot is 100,000 units of the base currency. On a USD-quoted pair, one pip on a standard lot is worth about USD 10, roughly AUD 15. That means a 50-pip move is worth about USD 500. A standard lot is a large position for most retail accounts, which is why mini and micro lots exist, letting smaller accounts size positions sensibly relative to their balance.
What is the smallest lot size in forex?
The smallest commonly available is the micro lot, 1,000 units, where one pip is worth about USD 0.10. Some brokers also offer nano lots of 100 units. Micro lots are ideal for beginners and small accounts because they let you take a real position while keeping the dollar risk per pip very low, so a learning mistake costs cents rather than dollars per pip.
How does lot size affect pip value?
Pip value scales directly with lot size. On a USD-quoted pair, one pip is worth about USD 10 on a standard lot, USD 1 on a mini lot, and USD 0.10 on a micro lot. Double your lot size and you double the value of every pip, in both profit and loss. This is why lot size, not leverage, is the real lever on how much risk you are taking in dollar terms.
What lot size should a beginner use?
A beginner should usually start with micro lots, and should choose the size based on risk rather than habit. Decide how much of your account to risk on a trade, a small fixed percentage, work out where your stop loss sits in pips, and pick the lot size so that the stop equals your chosen risk. The position size calculator does this automatically. The common mistake is choosing a round lot size first and only then discovering how much is at stake.
Can you trade fractional lots?
Yes. Most brokers let you trade in increments such as 0.01 lots, which is a micro lot, all the way up to large multiples of standard lots, in steps of 0.01. So you are not limited to whole standard, mini or micro lots; you can size a position precisely to your risk, for example 0.37 lots. This flexibility is what makes proper position sizing possible rather than forcing you into fixed jumps.
