Forex Lot Size Calculator

Calculate the exact lot size for your forex trades — standard, mini, or micro lots — based on your account risk parameters.

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Calculator

Risk Amount ($)

$100.00

Standard Lots

0.00

Mini Lots

0.00

Micro Lots

0.00

How It Works

Lot sizing determines how many units of currency you trade. Forex lots come in three standard sizes: standard (100,000 units), mini (10,000 units), and micro (1,000 units).

This calculator converts your position size into lots. It uses your account balance, risk percentage, stop loss distance, and pip value to calculate the safest lot size for each trade.

Using proper lot sizing is essential for risk management — it ensures you don't risk too much of your account on any single trade.

The Formula

Position Size (units) = (Account Balance × Risk %) / (Stop Loss × Pip Value), then convert to lots: Standard = Units / 100000, Mini = Units / 10000, Micro = Units / 1000

Standard Lot = 100,000 units (1.0 lot), Mini Lot = 10,000 units (0.1 lot), Micro Lot = 1,000 units (0.01 lot)

Example

Scenario: You have a $5,000 account, risk 2% per trade, with a 50-pip stop loss and $10 pip value.

Calculation: Risk Amount = $5,000 × 2% = $100. Position Size = $100 / (50 × $10) = 0.2 lots.

Result: Trade 0.20 standard lots (20,000 units), or 2.00 mini lots, or 20.00 micro lots.

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Frequently Asked Questions

What is a standard lot?
A standard lot equals 100,000 units of the base currency. One pip movement on a standard lot is typically worth $10 for most major currency pairs.
What is the difference between lot types?
Standard lots (1.0) = 100K units, Mini lots (0.1) = 10K units, Micro lots (0.01) = 1K units. Mini and micro lots allow smaller accounts to trade with proper risk management.
Which lot size should I use?
Use the lot size that matches your account balance and risk tolerance. A general guideline: accounts under $1,000 should use micro lots, $1,000-$10,000 mini lots, and over $10,000 can trade standard lots.
How does pip value change with lot size?
Pip value scales with lot size. Standard lot = $10/pip, Mini lot = $1/pip, Micro lot = $0.10/pip for most major pairs where the quote currency is USD.