Forex Position Size
Calculator
Successful trading is 90% risk management. Calculate exactly how many lots you should trade to protect your capital and stay in the game.
Trading on Margin? Remember that your leverage settings don't change the dollar amount of your risk, only the required capital to open the position. Always stick to your calculated lot size.
Master Professional Position Sizing
How to Use the Calculator
Account Balance
Input your current total trading capital in your account currency (USD, EUR, etc.).
Risk Percentage
Decide how much of your total balance you want to risk on this single trade (Professional range: 0.5% - 2%).
Set Stop Loss
Define your escape plan. Enter the number of pips between your entry price and your invalidation level.
Select Pair
Currency pairs have different pip values based on their decimals (e.g., JPY vs USD pairs).
What is Position Sizing?
Position sizing is the most critical component of a professional risk management strategy. It ensures that no single trade can cause catastrophic damage to your portfolio.
"Amateurs focus on how much they can make. Professionals focus on how much they could lose."
Why It Matters
Calculated position sizing transforms trading from a gamble into a structured business. It allows your "edge" to play out over the long term by protecting you from inevitable losing streaks.
The Math Behind the Magic
You don't need to be a math genius to understand position sizing. The calculator automates this universal formula:
Lot Size = (Balance × Risk %) ÷ (Stop Loss × Pip Value)
Worked Example:
- Account Balance: $10,000
- Risk Percentage: 2% ($200 risk)
- Stop Loss: 50 Pips
- Pair: EUR/USD ($10 per pip on a standard lot)
Calculation
Final Position Size
($200 / $500)
Lot Sizes Explained
Not all brokers use "lots." Some use units. Here is exactly how they translate for standard USD quote pairs (like EUR/USD).
| Lot Type | Volume | Units | Pip Value |
|---|---|---|---|
| Standard | 1.00 | 100,000 | $10.00 |
| Mini | 0.10 | 10,000 | $1.00 |
| Micro | 0.01 | 1,000 | $0.10 |
The Power of Risk:Reward
Position sizing keeps your risk constant. But what about your reward? By strictly risking $200 per trade, you can define your targets mathematically.
Reviewed by Expert Educator
This calculator uses industry-standard formulas utilized by institutional traders. It was designed to ensure you never risk more than your intended percentage, protecting you from catastrophic drawdowns.
Read about our educational standards