Lot Size in Forex: Standard, Mini and Micro Lots Explained

Lot size in forex is the amount of currency you buy or sell in a single trade, and it is the biggest single choice that decides how much you can win or lose per pip. A standard lot is 100,000 units, a mini lot is 10,000 and a micro lot is 1,000. Choosing the right one for your account matters more than almost any entry signal.

What is a lot, and why does it exist?

Currencies trade in large round amounts, so the market uses a fixed unit called a lot to keep trades tidy. Rather than typing "buy 100,000 euros", you simply type "1.00 lot". Your platform, such as MetaTrader 5, converts that into units for you.

Lots are a count of units of the first currency in the pair. On EUR/USD, one lot means 100,000 euros. The money value of each move then follows from the lot, which is why a pip is worth different amounts to different traders.

The main lot sizes

• Standard lot: 100,000 units, 1.00 on most platforms
• Mini lot: 10,000 units, 0.10
• Micro lot: 1,000 units, 0.01

You can also enter sizes in between, such as 0.25 or 0.03 lots, subject to what your platform and account allow. Always check the minimum and step on the platform before you trade.

What each lot size is worth per pip

For a pair quoted in dollars, such as EUR/USD, one pip is 0.0001. Multiply that by the units and you get the dollar value. These are illustrative round figures.

• 1.00 lot: 100,000 × 0.0001 = $10 per pip
• 0.10 lot: 10,000 × 0.0001 = $1 per pip
• 0.01 lot: 1,000 × 0.0001 = $0.10 per pip

So a 20 pip move is $200 on a standard lot, $20 on a mini lot and $2 on a micro lot. The market's move is identical. Only your exposure changed.

The same price move can be a rounding error or a large loss. Lot size is the dial.

A worked example: choosing a lot size

Imagine a $1,000 account. You decide to risk no more than 1% on a trade, which is $10. You plan a stop loss 25 pips away from your entry on EUR/USD.

1. Money you accept losing: $10
2. Stop distance: 25 pips
3. Value per pip you can afford: $10 ÷ 25 = $0.40
4. Matching lot size: $0.40 ÷ $10 per standard lot = 0.04 lots

So the sensible size is about 0.04 lots, a little under a mini lot. A beginner who instead opened 1.00 lot would face $250 of loss on the same stop, a quarter of the account in one trade. The risk calculator does this sum for you for any pair and stop distance, and the pip calculator shows the value of a pip.

Lot size and margin

A bigger lot needs more margin, which is the money your account sets aside to hold the position open. Leverage reduces the margin needed but does not reduce the risk: the profit and loss per pip depend on the lot, not on the leverage. Leverage of up to 1:500 is available on all DMA Capitals accounts, but using more of it simply allows a bigger lot, and with it a bigger swing. We cover this in detail in Leverage in Forex.

For example, if EUR/USD is at 1.1000 and you buy 0.10 lot at 1:500, the position is worth about $11,000 and the margin set aside is about $22. Check the exact figure with the margin calculator before you trade, since it depends on the pair and price.

Mistakes beginners make

• Choosing a lot size first and a stop second, instead of the reverse
• Using the same lot size on every pair, even when pip values differ
• Increasing the size after a loss to win it back
• Forgetting that the spread is a cost on every lot

A small account does not need to feel limiting. The Standard account starts at a $10 minimum deposit, and micro lots let you practise with trade sizes that match it. The point is to learn the process while the stakes are low.

What to do next

Open a demo account and place trades at 0.01, 0.10 and 1.00 lots on the same pair. Watch the profit and loss figure move for each. Then work out a lot size for a 1% risk with the calculator, and use that size every time. Leveraged products carry a high risk of losing money, as the risk warning explains.