TL;DR — A lot is the standard unit size for a forex trade. One standard lot equals 100,000 units of the base currency, a mini lot is 10,000, and a micro lot is 1,000. Understanding what is a lot in forex matters because lot size directly affects your pip value, your risk, and the commission you pay per trade — and a per-lot rebate can lower that cost on every lot, win or lose.

Why traders talk in lots instead of units

If you buy 1,000 euros against the US dollar, you are buying 1,000 units. That is precise, but it is not how the market is quoted. Brokers, platforms, and liquidity providers all standardise order sizes into lots so that everyone is speaking the same language. When you see a trade ticket showing 0.10 lots, you are really looking at 10,000 units — the platform just saves you the mental arithmetic.

The lot system also makes pip values predictable. A pip is the smallest conventional price move in a currency pair, usually 0.0001 for most pairs and 0.01 for JPY pairs. On a standard lot, one pip is worth roughly $10 on a USD-quoted pair. On a mini lot it is about $1, and on a micro lot about $0.10. Those round numbers are not an accident — they are the reason the lot convention stuck.

Standard, mini, and micro lots compared

The three sizes you will meet most often are standard, mini, and micro. Some brokers also offer nano lots (100 units), but they are less common outside beginner-friendly accounts.

Lot typeUnits of base currencyTypical pip value (USD-quoted pair)Common use
Standard100,000About $10Funded accounts, larger positions
Mini10,000About $1Intermediate sizing
Micro1,000About $0.10Small accounts, learning
Nano100About $0.01Very small test trades

These pip values are approximate and assume the US dollar is the quote currency. If the USD is the base currency or neither currency is USD, the exact pip value shifts with the exchange rate. Your platform usually calculates it for you in real time.

What a lot means for gold (XAUUSD)

Gold is quoted differently from currency pairs, and this trips up a lot of new traders. One standard lot of gold is typically 100 troy ounces, not 100,000 units. A mini gold lot is 10 ounces, and a micro gold lot is 1 ounce. The price move that counts as one pip or one point depends on the broker's quoting convention, but the principle is the same: bigger lot, bigger dollar move per tick.

Because gold is more volatile than most major currency pairs, a standard lot of XAUUSD can move several hundred dollars in a single session. Many traders who are comfortable with a mini lot on EURUSD will still choose a micro lot on gold. If gold is your main market, it is worth reading a dedicated guide such as our gold cashback pillar before sizing up.

How lot size changes your risk, margin, and cost

Lot size is the single biggest lever on your risk per trade. Doubling your lot size doubles your pip value, which doubles the dollar impact of every move — both in your favour and against you. It also increases the margin your broker holds, because margin is calculated as a percentage of notional position size.

Cost scales with lots too. Spreads, commissions, and swap charges are all applied per lot or per unit of volume. That is why two traders using the same strategy can end up with very different net results: one trades 0.10 lots, the other trades 1.00 lot, and the cost difference is tenfold.

This is where a per-lot rebate matters. Expaid returns most of the broker's commission to you as a cashback payment on every lot you trade, regardless of whether the trade wins or loses. It does not change your spreads or your strategy — it simply reduces the cost attached to each lot. You can see how that adds up with the cashback calculator.

Choosing a lot size that fits your account

There is no universal correct lot size, but there is a repeatable process for finding yours.

  • Decide the maximum you are willing to lose on a single trade, expressed in dollars.
  • Measure the distance from your entry to your stop loss in pips.
  • Divide your dollar risk by that pip distance to get your required pip value.
  • Convert that pip value into lots using your platform's pip value per lot.
  • Round down, not up, and check that the resulting margin fits comfortably in your account.

For example, if you are willing to risk $50 on a trade with a 25-pip stop, you need a pip value of about $2. On a USD-quoted pair, that points to roughly 0.20 lots. If the same setup appeared on gold, the pip value per lot is different, so the lot size would be smaller. Always run the numbers for the specific instrument.

In our view — most beginner losses are not caused by bad analysis but by lot sizes that were too large for the account. A trader who halves their size often finds the strategy suddenly "works", because they can finally hold a position through normal noise without being forced out by margin or emotion.

Where lots fit into your overall trading costs

Every trade you place has a cost attached to it: the spread, any commission, and overnight swap if you hold. Those costs are charged per lot, so the more lots you trade over a month, the more you pay. A rebate changes the arithmetic without changing your execution.

If you already trade with a broker, you can keep your account and still collect cashback — see our guide on getting cashback on an existing account. If you are still choosing a broker, the rate board shows live rebate rates per lot, and the switch calculator estimates what you might be leaving on the table each month.

Where to go next

Now that you know what a lot is and how it drives both risk and cost, the next step is to see what your own trading volume is worth. Check the live rebate rates on the Expaid rate board, run your typical monthly lots through the rebate calculator, and if the number surprises you, create a free account to start collecting cashback on every lot — win or lose.