Lot Size Calculator
Calculate the correct forex lot size based on your account balance, risk percentage, and stop-loss distance. Never over-risk a position again.
What Is Lot Size in Forex Trading?
A lot is the standardised unit of measurement in forex trading that determines the number of currency units you are buying or selling. There are three standard lot sizes used by retail forex traders:
| Lot Type | Units | Pip Value (USD pairs) | Best For |
|---|---|---|---|
| Standard Lot | 100,000 | $10.00 | Accounts above $25,000 |
| Mini Lot | 10,000 | $1.00 | Accounts $5,000–$25,000 |
| Micro Lot | 1,000 | $0.10 | Accounts below $5,000 |
Choosing the correct lot size is the most important risk management decision you make on every trade. Too large and a normal stop-loss wipes out an unacceptable percentage of your account. Too small and profitable trades do not generate meaningful returns.
How to Calculate Lot Size
Standard Lots = Units / 100,000
Risk amount = $10,000 × 1% = $100
Pip value per standard lot = $10. Total pip cost = 20 × $10 = $200 per standard lot.
Lot size = $100 / $200 = 0.50 standard lots (50,000 units)
Risk amount = $5,000 × 2% = $100
Total pip cost = 50 × $10 = $500 per standard lot.
Lot size = $100 / $500 = 0.20 standard lots (20,000 units, or 2 mini lots)
Lot Size Quick Reference by Account Size
| Account | 1% Risk | 20-Pip SL | 50-Pip SL | 100-Pip SL |
|---|---|---|---|---|
| $1,000 | $10 | 0.05 lots | 0.02 lots | 0.01 lots |
| $5,000 | $50 | 0.25 lots | 0.10 lots | 0.05 lots |
| $10,000 | $100 | 0.50 lots | 0.20 lots | 0.10 lots |
| $25,000 | $250 | 1.25 lots | 0.50 lots | 0.25 lots |
| $50,000 | $500 | 2.50 lots | 1.00 lots | 0.50 lots |
Table assumes EUR/USD or other USD-quoted pair at $10 per pip per standard lot.
The 1% Rule: Why It Matters
The 1% rule states that you should never risk more than 1% of your account on any single trade. At 1% risk per trade, a devastating losing streak of 10 consecutive losses only reduces your account by approximately 9.6% (due to compounding). At 5% risk, the same streak wipes out 40%. At 10% risk, you lose 65%.
Vector Ridge signals use the Grade A–E conviction system to help subscribers scale their risk. Grade A (highest conviction) might warrant 1.5–2% risk. Grade D (speculative) should be sized at 0.5% or less. This conviction-based sizing is what produces consistent risk-adjusted returns — the same approach that generated a 2.10 Sharpe ratio in 2025.
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A standardised unit of currency. Standard lot = 100,000 units ($10/pip on USD pairs). Mini = 10,000 ($1/pip). Micro = 1,000 ($0.10/pip).
Lot Size = (Account Balance × Risk %) / (Stop Loss Pips × Pip Value). Enter your values in the calculator above for instant results.
At 1% risk with 20-pip stop on EUR/USD: 0.50 standard lots. With 50-pip stop: 0.20 lots. Always depends on stop-loss distance.
Standard = 100,000 units. Mini = 10,000. Micro = 1,000. Most retail traders use mini or micro lots. Standard lots suit accounts above $25,000.
0.5%–2% for most traders. Beginners: 0.5–1%. At 1%, 10 consecutive losses only reduce your account ~9.6%. Vector Ridge conviction grades help calibrate risk by signal quality.