Lot Size Calculator — Precise Position Sizing
Most traders lose money not because of a bad strategy, but because they trade too large. This calculator tells you the mathematically correct lot size for every trade — based on what you can actually afford to lose, not on gut feeling. Set your stop loss level, your account balance, and your risk limit. We handle the rest across 76+ instruments including forex, gold, crypto, indices, and commodities.
How to Calculate Lot Size
Position sizing is the discipline of determining how many units to trade so that a single losing trade risks only a defined fraction of your account. It is the foundation of professional risk management and separates consistently profitable traders from those who blow accounts.
The formula used by this calculator:
Example: $100 at risk, 20 pip stop loss, $10 pip value per standard lot = 0.50 lots (50,000 units).
Lot Size by Broker — Exness, IC Markets & XM
Contract sizes, minimum lots, and account types differ across brokers. Using the wrong contract size produces wrong results. Here is what you need to know for the most popular brokers.
Stop Loss Price vs Stop Loss in Pips
This calculator accepts a stop loss price rather than a raw pip count. This approach is more accurate — you enter the exact price level where you'd exit the trade, and the tool converts the price difference into pips internally, accounting for the correct pip size for each instrument.
Enter your open and stop loss prices. The calculator derives the pip distance automatically — no mental math needed.
Requires you to know the pip distance first. Introduces an extra manual step and is easier to miscalculate, especially on JPY pairs.
🔍 Loss Autopsy — Why Did This Trade Lose?
Enter the details of a losing trade and this tool explains exactly what went wrong mathematically — whether it was position size, stop placement, or execution.
Lot Size Types — Units & Risk Reference
| Lot Type | Units | Pip Value (EUR/USD) | Typical Use |
|---|---|---|---|
| Standard Lot | 100,000 | $10.00 | Professional / large accounts |
| Mini Lot | 10,000 | $1.00 | Intermediate traders |
| Micro Lot | 1,000 | $0.10 | Beginners / small accounts |
| Nano Lot | 100 | $0.01 | Practice / cent accounts |
How Much Should You Risk Per Trade?
Recommended for beginners and prop firm challenges. Maximises longevity.
Standard for experienced retail traders with a tested strategy.
High risk. Increases returns but significantly raises ruin probability.
Prop Firm Lot Size Calculator — FTMO, MyForexFunds & More
Most prop firm challenge failures come from oversized positions, not bad strategy. The Prop Firm Mode toggle above pre-fills the correct account size and risk percentage for each firm so you never accidentally exceed their daily loss or drawdown limits.