Beginner 5 min read · updated 2026-05-25

Lot Size in Forex: Standard, Mini, Micro, Nano Explained

A forex lot is the unit of position size. Standard lots are 100,000 units; mini = 10,000; micro = 1,000; nano = 100. Learn how to choose the right lot size for your account.

What is a lot in forex?

A lot is the standardized unit of position size in forex. The four standard lot sizes are:

Lot type	Units of base currency	Common abbreviation
Standard lot	100,000	1.0 lot
Mini lot	10,000	0.1 lot
Micro lot	1,000	0.01 lot
Nano lot	100	0.001 lot (rare)

When you “buy 1 lot of EUR/USD,” you’re agreeing to a contract for €100,000 worth of euros against the equivalent dollars.

Why standardized lot sizes exist

Lot sizes standardize position sizing across brokers and platforms. Without them, a “10,000-unit” trade at one broker might be different from a “10,000-unit” trade elsewhere — confusing for traders, error-prone for risk calculation.

MetaTrader 4, MetaTrader 5, cTrader, and most proprietary platforms all use the same lot convention.

How to choose your lot size

Your lot size should be driven by your position-size formula — not by what feels comfortable.

The 1% rule

Risk no more than 1% of your account equity on any single trade.

Max risk per trade = Account equity × 1%
Max position size = Max risk / (stop-loss distance in pips × pip value per lot)

Worked example

You have $5,000 in your account, trading EUR/USD with a 30-pip stop loss.

Max risk = $5,000 × 1% = $50
EUR/USD pip value (1 standard lot, USD account) = $10
Max lot size = $50 / (30 pips × $10) = 0.167 standard lots ≈ 0.17 lots

Round down for safety: trade 0.15 lots (1.5 mini lots).

Lot size by account size

A rough guide for what lot size makes sense per account:

Account size	Recommended max lot	Notes
$50–500	0.01–0.03 lots (micro)	Use a broker offering nano/micro lots
$500–2,000	0.05–0.15 lots	Most retail trading happens here
$2,000–10,000	0.10–0.50 lots	Spread + commission becomes less material
$10,000–50,000	0.50–2.00 lots	ECN brokers with $3.50/lot commission
$50,000+	1.00 lots+	Volume tier rebates start to matter

These are maximums, not targets. Most professional retail traders trade well below their account’s “max.”

Mini, micro, nano — which brokers offer them?

Cent accounts (FBS, Exness, XM Cent, Roboforex Cent) deposit money in cents instead of dollars — a $10 deposit shows as $1,000 in cents. This lets beginners trade micro lots while feeling like they’re trading more significant amounts.

Most brokers offer 0.01 lot (micro) minimum. Brokers that go down to 0.001 (nano):

Exness
FBS
HF Markets
Octa

For accounts under $200, use micro/nano lot brokers — otherwise position sizing forces over-leveraging.

Common mistakes

Trading 1 standard lot on a $1,000 account — a 100-pip move against you ($1,000 loss) wipes the account. Even a 100-pip move is a normal day’s range on volatile pairs.
Increasing lot size to “recover” losses — known as “revenge trading.” Statistical death sentence for retail accounts.
Ignoring per-lot commission — on a $3.50/side commission, trading 0.5 lots costs $3.50 in commission ($1.75 each side). Tight scalping strategies must account for this.
Forgetting margin requirements — 1 standard lot at 1:30 leverage requires ~$3,600 in margin (3.3% of $108,000). If your account is $5,000, that single trade locks up most of your free margin.