What is a lot in forex, and how position size actually works
Verdict
- A lot is a standardised unit of the base currency being traded: a standard lot is 100,000 units, a mini lot 10,000, a micro lot 1,000, and a nano lot (where offered) 100.
- Lot size determines pip value directly — on most USD-quoted pairs, a standard lot moves roughly $10 per pip, a mini lot roughly $1, and a micro lot roughly $0.10.
- Not every broker offers every size; micro lots are close to universal among retail-focused brokers, while nano lots are offered by only a minority.
- Position size in lots, not account balance in dollars, is the number that actually determines the dollar risk of a trade at a given stop distance.
- Cent accounts add a further layer below micro and nano, denominating positions in a unit roughly 1/100th the size again — useful specifically for very small deposits.
"Lot" is one of the first terms a new trader hits and one of the most consistently under-explained, usually reduced to a single sentence before the article moves on to something else. Position sizing depends entirely on understanding it properly, so this page stays on the topic.
The four sizes, and what each is worth
A lot is not a percentage or a flexible unit — it is a fixed quantity of the base currency in the pair being traded. The four common sizes scale by a factor of ten each.
- Standard lot: 100,000 units — roughly $10 per pip on most USD-quoted major pairs.
- Mini lot: 10,000 units — roughly $1 per pip.
- Micro lot: 1,000 units — roughly $0.10 per pip.
- Nano lot: 100 units, where offered — roughly $0.01 per pip.
Why pip value is the number that matters
Lot size translates directly into pip value, and pip value multiplied by your stop distance in pips is your dollar risk on a trade. A 30-pip stop on one standard lot risks roughly $300; the same stop on one micro lot risks roughly $3 — a hundred-fold difference for the identical strategy, purely from lot size. This is why position sizing in lots, not account balance in dollars, is the actual lever that sets risk per trade.
- Dollar risk = pip value × stop distance in pips, not a percentage guess.
- The same stop-loss distance produces wildly different dollar risk depending only on lot size chosen.
- Fractional lot sizes (e.g. 0.3 standard lots) are usually tradeable in 0.01-lot increments on most platforms.
Availability differs by broker and account type
Micro lots are close to universal among retail-focused brokers today, making 0.01 lots the practical minimum position size on most Standard accounts. Nano lots are less common and offered by only a minority of brokers, usually as a specific account feature rather than a default. Some brokers also restrict certain instruments — indices, some exotics — to a coarser minimum lot size than their forex pairs.
Cent accounts go one step further
For a deposit too small to size sensibly even at 0.01 standard lots, some brokers offer cent accounts, which scale the display unit down by roughly another factor of 100 — effectively allowing position sizes finer than a standard-account micro lot while the real capital at risk remains unchanged. This is a separate account type, not simply a smaller lot size within Standard.
How much is a lot worth in forex?
It depends on the size and the pair. A standard lot (100,000 units) is worth roughly $10 per pip on most USD-quoted major pairs, a mini lot (10,000 units) roughly $1 per pip, and a micro lot (1,000 units) roughly $0.10 per pip.
What is the smallest lot size I can trade?
On most Standard accounts, 0.01 lots (one micro lot) is the practical minimum. Some brokers offer nano lots (0.001 lots) or cent accounts, which allow smaller position sizes still, specifically useful for very small deposits.
How do I calculate my risk in dollars from lot size?
Multiply the pip value for your chosen lot size by your stop-loss distance in pips. A 30-pip stop on one micro lot (worth roughly $0.10 per pip) risks approximately $3; the same stop on one standard lot risks roughly $300.
Is a bigger lot size always riskier?
For the same stop distance, yes — dollar risk scales directly with lot size. But risk is set by the combination of lot size and stop distance together, not lot size alone, so a wider stop on a smaller lot can carry the same risk as a tighter stop on a larger one.
Nothing here is investment advice. CFDs carry a high risk of losing money rapidly due to leverage, and most retail accounts lose money. The figures above are arithmetic illustrations, not projections.