What Is a Lot? Pip Value Explained

When you open a forex trade you do not enter the market with "an amount", you enter with a size, and the unit of size is the lot. Understanding lots is the first step to knowing what each price move actually earns or costs you, which is what separates real risk management from guessing.

Lot types

Standard lot: 100,000 units of the base currency.
Mini lot (0.10): 10,000 units.
Micro lot (0.01): 1,000 units.

Example: buying 0.10 lots of EURUSD means your position is worth 10,000 euros, even though the margin reserved from your balance is far smaller thanks to leverage.

Pip value: the formula

In most pairs a pip is the fourth decimal (0.0001). Its value in the quote currency:

Pip value = position size in units × 0.0001

Applied to dollar-quoted pairs like EURUSD:

Standard lot (100,000 units): one pip = $10.
Mini lot (10,000 units): one pip = $1.
Micro lot (1,000 units): one pip = $0.10.

For pairs where the dollar is not the quote currency (like USDJPY, where a pip is 0.01), the value is computed in the quote currency and converted at the current rate. The platform shows these numbers computed for you, but knowing the logic protects you from surprises.

A full example, both directions

You buy 0.10 lots of EURUSD at 1.1500; pip value is $1:

Price rises 40 pips to 1.1540 and you close: $40 profit.
Price falls 40 pips to 1.1460 and you close: $40 loss.

Same move, exactly opposite outcome, which is why position size is your first risk decision.

How to choose a sensible size

A common rule among traders: risk only a small share of your balance per trade (many use 1–2%). The steps:

Decide the amount you accept losing on this trade.
Decide your stop-loss distance in pips from entry.
Right size = acceptable loss ÷ (stop distance × pip value per lot).

Example: you accept a $20 loss and your stop is 40 pips away, the right size is 0.05 lots (fifty cents per pip). You know your maximum loss before pressing the button, not after.

In short

A lot is the unit of trade size: standard 100,000 units, mini 10,000, micro 1,000.
Pip value follows size: $10 standard, $1 mini, $0.10 micro on dollar-quoted pairs.
Profit and loss are two faces of the same arithmetic; size scales both.
Choose size from your accepted risk and stop distance, not from the excitement of the moment.

Practise the maths on forex pairs in a demo account, check each instrument's size limits in the market specifications, and read the risk disclosure before trading real money.