Lot Size Calculator
Find position size from your account balance, risk %, entry/stop levels, pip size, and contract settings.
Risk-based sizing
Stop-loss aware
Pip value breakdown
Calculator suite
Plan trades before you click buy or sell.
Compare PnL, margin, position size, and overnight costs with clear assumptions and editable inputs.
Step 1
Risk and trade inputs
Live result
Recommended lot size
Suggested lot size
0.2
Position size that keeps your risk aligned with the selected account percentage.
Risk amount
$100.00
Stop distance
50 pips
Pip value per lot
$10.00
Risk percent
1%
These results are estimates for planning and education. Actual outcomes can vary with spread, slippage, broker execution, conversion rates, and fee schedules.
Formula used
Risk amount
riskAmount = accountBalance × riskPercent / 100
Stop distance
stopDistancePips = |entryPrice - stopLossPrice| / pipSize
Lot size
pipValuePerLot = contractSize × pipSize × quoteToAccountRate; lotSize = riskAmount / (stopDistancePips × pipValuePerLot)
Frequently asked questions
What is lot size in trading?
Lot size is the position volume. In forex, one standard lot commonly represents 100,000 units of base currency.
Why does stop-loss distance matter?
A wider stop increases risk per lot, so recommended lot size must decrease to keep risk percentage constant.
Can I use this as a position size calculator?
Yes. This lot size calculator is a position size calculator based on fixed percentage risk management.