A position size calculator computes the right lot size for a single trade based on your account balance, risk tolerance, entry price, and stop-loss price. Unlike the lot size calculator (which works in pips), the position size calculator works directly with prices, so you can plug in your chart levels and get the answer in one step. Use this calculator before placing any manual trade and configure your Expert Advisor with the equivalent risk-percent settings.
Position Size Calculator
How the Position size calculator works
Step 1: Stop loss distance in pips = abs(Entry – Stop loss) / Pip size. Step 2: Risk amount = Account balance * Risk per trade %. Step 3: Position size in standard lots = Risk amount / (Stop loss pips * Pip value per standard lot). Example: $5,000 account risking 1 percent ($50) with entry at 1.08500 and stop at 1.08000 on EURUSD gives 50-pip stop, 0.10 standard lot position size.
Frequently asked questions about the position size calculator
What is the difference between position size and lot size?
Position size is the total exposure of a single trade in dollars (or account currency). Lot size is the same exposure expressed in standard, mini, or micro lots. A 0.10-lot position on EURUSD with a 50-pip stop is a $50 maximum loss position.
Should I use fixed or risk-based position sizing in my EA?
Risk-based sizing is almost always better. It scales position size with account equity, keeps drawdown predictable, and adapts to changing market conditions. Fixed lot sizes break down as your account grows or shrinks.
What is the safest risk per trade for a beginner?
0.5 percent is the safer choice for beginners. With 0.5 percent per trade, a string of ten consecutive losses only drops the account by about 5 percent, which is recoverable. With 2 percent per trade, the same losing streak drops the account by 18 to 20 percent, which is much harder to recover from.
How does the position size formula handle different pairs?
The calculator adjusts for pip size automatically: 0.0001 for most pairs, 0.01 for JPY pairs, 0.1 for gold (typical broker convention). The pip value per standard lot field lets you plug in the right value for your specific pair and account currency.
How does position sizing change with leverage?
Leverage does not change the risk per trade or position size formula; it only changes the margin required to open the position. A 50-pip stop loss with 0.10 lot size on EURUSD risks $50 regardless of whether your broker offers 1:30 or 1:500 leverage. Higher leverage just frees more cash but does not affect risk per trade.