Lot

What a lot means

A lot is a standardised trade size. In forex, one standard lot equals 100,000 units of the base currency of the pair. Smaller sizes are expressed as fractions of that: a mini lot is 10,000 units (0.10 lot), a micro lot is 1,000 units (0.01 lot), and some brokers offer a nano lot of 100 units (0.001 lot). The lot is a unit of position size, not a measure of money you pay.

The idea of a lot predates online trading. Standard sizes made it easier for dealers to quote and match orders. Today the term is used by most retail platforms, including MetaTrader, where you enter volume in lots rather than units. The size of a lot differs by instrument. A CFD on an index, a share or gold may define one lot as one contract, one share or a number of ounces, depending on the broker's contract specifications.

Anyone trading forex or CFDs meets lots when placing an order. Choosing the lot size is the most direct way to control how much a price move affects the account.

How it works

The position value is the lot size multiplied by the contract size and the price. For a forex pair, the base currency amount is the lots times 100,000. The profit or loss per pip then depends on the size.

• 1 standard lot: 100,000 units of base currency.
• 0.10 lot (mini): 10,000 units.
• 0.01 lot (micro): 1,000 units.

For pairs where the quote currency is the account currency, such as EUR/USD with a USD account, one pip (0.0001) on one standard lot is worth 100,000 x 0.0001 = 10 units of the quote currency. Scale this by the lot size to find the pip value of your position. For pairs quoted in another currency, the pip value is converted at the current rate. The broker's tick value and contract size fields in the platform show the exact figures.

Required margin follows from the position value: margin equals position value divided by leverage. Because lots determine the notional size, they also determine how much margin is used and how close you are to a margin call. Brokers set a minimum lot, a maximum lot and a step. A typical minimum is 0.01 lot, and a step of 0.01 means you can trade 0.01, 0.02, 0.03 and so on.

A worked example

The numbers are illustrative only. Suppose you trade EUR/USD at 1.1000 with a USD account and leverage of 30:1.

1. Trade size: 0.20 lot = 0.20 x 100,000 = 20,000 EUR.
2. Position value in USD: 20,000 x 1.1000 = 22,000 USD.
3. Required margin: 22,000 / 30 = about 733 USD.
4. Pip value: 20,000 x 0.0001 = 2 USD per pip.
5. If the price moves 25 pips against you, the loss is 25 x 2 = 50 USD, before spread and any financing.

Now compare 1.00 lot on the same pair.

1. Position value: 110,000 USD. Margin: 110,000 / 30 = about 3,667 USD.
2. Pip value: 10 USD. A 25-pip adverse move costs 250 USD.

The same market move produces five times the loss because the lot size is five times larger. For an account with 1,000 USD, the 1.00 lot position would not be affordable on margin alone, and the 0.20 lot position would already use a large part of the equity.

Why it matters

Lot size is the lever that sets risk in absolute money. Two traders who use the same entry and stop can have very different exposure if they choose different lots. Sizing trades by lots without relating them to account equity and stop distance is a common cause of oversized losses.

Smaller lots allow smaller accounts to trade with more careful risk control, which is why micro lot support is useful. Costs also scale with size: spread cost in money equals the spread in pips times the pip value, so larger lots pay more in absolute terms. Contract specifications vary between instruments and brokers, so a lot in gold or an index CFD can represent a very different exposure from a lot in a currency pair.

How to use it in practice

1. Read the contract specification for the instrument: contract size, minimum lot, step and maximum lot.
2. Decide the amount you are willing to risk on a trade and the stop distance in pips or points.
3. Work out lot size: risk amount divided by (stop distance times pip value per lot).
4. Check the margin required for that lot and the free margin left.
5. Use a platform calculator, but confirm the numbers against the specification.
6. Start with the smallest sizes on a demo account to see how P&L changes.
7. Recheck lots after changing instrument, because the contract size may differ.

Common mistakes and misconceptions

• Assuming one lot means the same everywhere. It differs by instrument and broker.
• Confusing lots with units of currency invested. A lot is the notional size, not the cost.
• Trading the minimum lot without considering stop distance, which may still be too big for a small account.
• Forgetting that pip value changes with the pair and account currency.
• Ignoring that fractions such as 0.10 mean mini lot on forex but may mean something else elsewhere.
• Increasing lots to recover losses, which raises risk when the account is weakest.

Risks and limitations

Larger lots magnify losses just as they magnify gains, and leveraged positions can lose money fast. Spread and slippage costs grow with size. Some brokers do not offer micro lots, and minimum steps vary. Contract specifications can change, so always check the current figures for the account you hold. Nothing here recommends a particular size.

How Brokeli looks at it

In broker research we record minimum and maximum lot sizes, the lot step and contract sizes for major instruments, since these decide how finely a small account can control risk. Information comes from published research snapshots and contract specifications, so differences between brokers are visible. We treat flexible sizing as a practical feature, not as a reason to trade bigger.