Forex Lot Sizes Explained
Lot size determines the volume of your forex trade — how many currency units you are buying or selling. Choosing the correct lot size is one of the most critical risk management decisions you make on every trade. Trade too large and a 30-pip stop wipes 10% of your account. Size correctly and the same stop costs only 1%.
The Four Lot Sizes — Explained
| Lot Type | Units | EUR/USD Pip Value |
|----------|-------|-------------------|
| Standard | 100,000 | $10.00 |
| Mini | 10,000 | $1.00 |
| Micro | 1,000 | $0.10 |
| Nano | 100 | $0.01 |
Standard lot (1.0): 100,000 currency units. Used by well-capitalized traders with accounts of $10,000+. Each pip = $10 for USD-quoted pairs.
Mini lot (0.1): 10,000 units. Good for accounts of $1,000–$10,000. Each pip = $1.
Micro lot (0.01): 1,000 units. Ideal for accounts under $1,000 and beginners. Each pip = $0.10.
Nano lot (0.001): Available on some brokers including Exness. 100 units, $0.01/pip. Allows even tiny accounts to risk-manage properly.
Exness allows trading from 0.01 lots (micro) on most accounts. Some accounts allow 0.001 (nano).
How to Calculate the Correct Lot Size
The formula:
Lot size = (Account size × Risk %) ÷ (Stop loss in pips × Pip value per lot)
Example 1 — $1,000 account:
- Risk: 1% = $10
- Stop loss: 30 pips on EUR/USD
- Pip value per standard lot: $10
- Lot size = $10 ÷ (30 × $10) = $10 ÷ $300 = 0.033 lots → round to 0.03 lots
Example 2 — $5,000 account:
- Risk: 2% = $100
- Stop loss: 50 pips on GBP/USD
- Lot size = $100 ÷ (50 × $10) = $100 ÷ $500 = 0.2 lots
Example 3 — $500 account:
- Risk: 1% = $5
- Stop loss: 20 pips
- Lot size = $5 ÷ (20 × $10) = 0.025 lots → round to 0.02 lots (micro)
Most brokers and MT5 have built-in lot size calculators. Myfxbook.com/tools/position-size also offers a free calculator.
Common Lot Sizing Mistakes
Mistake 1: Always trading the same lot size. Trading 0.1 lot whether your stop is 10 pips or 100 pips means wildly different risk per trade. Lot size must be calculated per trade based on stop distance.
Mistake 2: "I will use small lots to be safe." Trading 0.01 lot with a 500-pip stop on a $100 account = $5 risk = 5% of account. Still overleveraged relative to account size. Small lots do not automatically mean safe — the stop distance matters equally.
Mistake 3: Martingale sizing. Doubling lot size after each loss to "recover." A string of losses (normal in any strategy) can blow an account in 5–8 trades. Martingale is the fastest route to a margin call.
Correct approach: Always calculate lot size from risk% and stop distance. Use a position size calculator until the math becomes second nature.
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