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

A lot is the unit used to size a forex trade. One standard lot is 100,000 units of the base currency, a mini lot is 10,000, a micro lot is 1,000 and a nano lot is 100. In MT4 and MT5 these appear as 1.00, 0.10, 0.01 and 0.001. On EUR/USD a standard lot moves $10 per pip, a mini lot $1, a micro lot $0.10 and a nano lot $0.01. The right lot size is not a fixed number: it follows from your account size, your risk per trade and your stop loss.

This guide explains each lot size, what it means in dollars and US margin, and how to pick the size that fits your account. All examples assume a US account in US dollars.

The Four Lot Sizes at a Glance

Lot	Shown in MT4/MT5	Units	Pip value on EUR/USD	Position value at 1.1000	US margin at 50:1
Standard	1.00	100,000	$10.00	$110,000	$2,200
Mini	0.10	10,000	$1.00	$11,000	$220
Micro	0.01	1,000	$0.10	$1,100	$22
Nano	0.001	100	$0.01	$110	$2.20

Each step down is ten times smaller in every way: units, dollars per pip and margin. Lot sizes can also be combined. A volume of 0.37 is 37 micro lots (37,000 units), worth $3.70 per pip on EUR/USD.

Many brokers set 0.01 lots as the smallest trade. Some let you trade in units instead of lots, which allows sizes smaller than a micro lot; true nano lots are less common. Check the minimum trade size in your broker’s contract specifications.

What Each Lot Size Means for Your Account

Standard lot (100,000 units)

Each pip is $10 on dollar-quoted pairs, so a 50-pip move is $500. One standard lot of EUR/USD controls about $110,000. That is a big position for most retail accounts.

Mini lot (10,000 units)

$1 per pip on EUR/USD. A common size for accounts of a few thousand dollars.

Micro lot (1,000 units)

$0.10 per pip. Micro lots let small accounts follow sensible risk rules, and they are the best way to move from a demo to a live account with little at stake.

Nano lot (100 units)

$0.01 per pip. Mostly useful for testing a strategy or an expert advisor with real orders while risking almost nothing.

Lot Size, Leverage and US Margin

The lot size sets how big your position is; leverage only sets how much of your money the broker holds as a deposit. Under CFTC rules, US retail forex dealers must collect at least 2% of the position’s value on major pairs (50:1) and 5% on other pairs (20:1).

Example: on a $5,000 account, one standard lot of EUR/USD ($110,000) needs $2,200 of margin, and it is 22 times the size of the account. A 50-pip loss would cost $500, or 10% of the account, on a single trade. The same trade with 0.10 lots risks $50 (1%). Use the margin calculator to see the deposit for any pair, and read leverage in forex for the risks.

How to Choose Your Lot Size

Choose the stop first, then the size. The formula:

Lots = (Account × Risk %) ÷ (Stop loss in pips × Pip value per standard lot)

Worked example. A $1,000 account risking 1% may lose $10 on the trade. The stop on EUR/USD is 25 pips away. Lots = $10 ÷ (25 × $10) = 0.04 lots, or 4 micro lots, worth $0.40 per pip. If the stop is hit, the loss is 25 × $0.40 = $10.

Here is the same rule (1% risk, 25-pip stop on EUR/USD) across account sizes:

Account	Risk at 1%	Lot size	Pip value
$500	$5	0.02	$0.20
$1,000	$10	0.04	$0.40
$5,000	$50	0.20	$2.00
$10,000	$100	0.40	$4.00
$25,000	$250	1.00	$10.00

A wider stop means a smaller lot for the same risk. With a 50-pip stop, every lot size in the table halves. The free lot size calculator handles any pair, including yen and cross pairs where the pip value isn’t $10. In MT5, the position size indicator lets you drag the stop on the chart and read the lots.

Common Lot Size Mistakes

• Trading “1 lot” because it is a round number. On a small account it turns a normal stop into a large loss.
• Keeping the same lot size on every pair. Pip values differ: 0.50 lots of USD/JPY at 150.00 is about $3.33 per pip, not $5.
• Increasing the size after a loss to win it back. That is the martingale trap.
• Opening several correlated trades at full size. Two trades on EUR/USD and GBP/USD of 0.20 lots each can act like a single 0.40-lot dollar position.

For more on risk per trade, read risk management in forex and how much money you need to start.

Frequently Asked Questions

How many units are in 1 lot in forex?

One standard lot is 100,000 units of the base currency. For EUR/USD, that is 100,000 euros, worth about $110,000 when the rate is 1.1000.

What does 0.01 lot mean?

0.01 lot is one micro lot, or 1,000 units of the base currency. On EUR/USD it is worth $0.10 per pip, so a 20-pip move is $2.

How much is 1 lot worth in dollars?

It depends on the pair and the price. One standard lot of EUR/USD at 1.1000 is $110,000; one standard lot of USD/JPY is $100,000, because the dollar is the base currency. Its pip value is $10 on EUR/USD and about $6.67 on USD/JPY at 150.00.

What lot size should I use with $100?

Even the smallest common size, 0.01 lots, risks $2.50 on a 25-pip stop on EUR/USD. That is 2.5% of a $100 account. Keep stops tight and trades few, or use a broker that allows sizes below a micro lot. Our guide on how much money you need to start compares account sizes.

Is a bigger lot size more profitable?

A bigger lot makes every pip worth more, in both directions. It increases losses exactly as much as gains, so the lot size should come from your risk limit, never from a profit target.

Disclaimer: This article is for educational purposes only and is not financial advice. Forex trading carries a high level of risk and may not be suitable for all investors. The CFTC notes that most retail forex customers lose money. Only trade with money you can afford to lose.

Sources

• CFTC regulations, 17 CFR 5.9, security deposits for retail forex transactions (eCFR).
• CFTC, Customer Advisory: Eight Things You Should Know Before Trading Forex (PDF).