Position Size Calculator
Optimize your money management by incorporating your broker's actual spread.
The standard pip value for 1 lot is 10 units of the quote currency (e.g. $10 for EUR/USD). If your account is in EUR, it is around 9.25 EUR.
Position Size
Sizes are calculated for standard lots (1 lot = 100,000 units).
Automate your trading journal
Save these calculations in 1 click and analyze your trades with StarQuant AI.
Complete Guide: Mastering position sizing & money management
What is a position size calculator?
A position size calculator (or lot calculator) is an essential trading tool that computes the exact asset volume (lots for Forex, shares or contracts) you should buy or sell. This calculation is based on your account balance, the percentage of risk you accept per trade, and the distance to your Stop Loss level.
Why use a lot and trading calculator?
In trading, risk management (money management) is the key driver of long-term profitability. Using a trading tool like our position calculator prevents you from risking too much of your account on a single trade. It eliminates emotional guesswork by giving you a mathematically accurate trade size.
How does spread affect position size calculations?
Spread is the difference between the buy price (Ask) and sell price (Bid) charged by your broker. When you open a trade, the spread artificially increases your Stop Loss distance. Our spread calculator incorporates this friction into the formula: by adding the spread to your initial Stop Loss, it automatically downsizes your position to ensure you do not exceed your planned risk.
How to calculate Forex lot sizes (EUR/USD, GBP/USD...)?
For Forex trading, the lot size formula is: Position Size (Lots) = Total Risk (in account currency) / ((Stop Loss in pips + Spread in pips) * Pip value per lot). Our calculator performs this operation instantly, automatically converting the pip value based on your account currency (EUR, USD, etc.) and the current entry price of the trading instrument.