Forex Lot Sizes Explained: Standard, Mini, Micro, and Nano Lots

In forex, a lot is a bundle of currency units. It exists so brokers, traders, and platforms can speak the same language. One standard lot is 100,000 units of the base currency. A mini lot is 10,000. A micro lot is 1,000. Some brokers also offer nano lots of 100 units.

The lot size you trade does not change your risk by itself. Risk comes from how many units you buy multiplied by how far your stop loss is from your entry. But lot sizes decide the minimum increments you can use, and they determine how much each pip is worth. That makes them a practical detail you cannot ignore.

Forex brokers quote position size in lots. Here is what each label means in units of the base currency.

• Standard lot: 100,000 units — the classic institutional size.
• Mini lot: 10,000 units — one-tenth of a standard lot.
• Micro lot: 1,000 units — one-hundredth of a standard lot.
• Nano lot: 100 units — only available at some brokers; useful for very small accounts.

A pip is usually the fourth decimal place in most pairs, or the second decimal in yen pairs. The dollar value of that pip depends on lot size and the pair you trade.

For EUR/USD, where the quote currency is USD, one standard lot moves $10 per pip. A mini lot moves $1 per pip. A micro lot moves $0.10 per pip. If your account is in USD, these numbers are what you see in your P&L. If your account is in EUR, GBP, or another currency, the pip value must be converted.

• EUR/USD standard lot: ~$10 per pip.
• EUR/USD mini lot: ~$1 per pip.
• EUR/USD micro lot: ~$0.10 per pip.
• USD/JPY standard lot: roughly ¥1,000 per pip, worth about $6.50 to $7.50 in USD depending on the exchange rate.

The position size formula gives you a number of units. To trade it, convert units into lots. Divide by 100,000 for standard lots, by 10,000 for mini lots, or by 1,000 for micro lots.

For example, if your risk plan says you should trade 8,500 units of EUR/USD, that is 0.085 standard lots. Most platforms let you type 0.08 or 0.09 directly, but it is often clearer to think in mini lots: 0.85 mini lots, or 8.5 micro lots. Choose the lot size that lets you get closest to your target without exceeding your risk.

If you have a $500 account and risk 1% per trade, you can only lose $5. On EUR/USD with a 20-pip stop, a micro lot loses $0.20 per pip, so 20 pips costs $4. That fits. A mini lot would lose $2 per pip and blow your $5 risk in 2.5 pips. Without micro lots, small accounts cannot trade safely.

This is why choosing a broker that supports micro or nano lots is a risk-management decision, not just a convenience. If your smallest increment is a mini lot, your effective minimum risk is ten times higher than with micro lots.

Most lot-size errors come from confusing labels with risk. Avoid these and you will already be ahead of most retail traders.

• Typing '1.0 lot' because it feels standard — on a small account, that can be ten or a hundred times too large.
• Rounding up instead of down — if the math gives 0.83 mini lots, use 0.8; never exceed your planned risk.
• Ignoring the account currency — a USD account trading EUR/GBP has two conversions to consider.
• Forgetting yen pairs are quoted to two decimals — a pip in USD/JPY is 0.01, not 0.0001.
• Mixing up position value with amount risked — a one-lot position can be worth $100,000 while the actual risk is only $50.

Keep this mental shortcut: one micro lot on EUR/USD is about $0.10 per pip. One mini lot is about $1 per pip. One standard lot is about $10 per pip. If you know your stop distance in pips and your account currency pip value, you can estimate risk in seconds before opening the platform.

Use the lot size calculator to translate position size into lots automatically, and the pip value calculator when your account currency is not the pair's quote currency. Ten seconds of checking beats ten minutes of regret.