Risk & Lot-Size Calculator
Know your dollar risk floor before you click buy — not just the percentage. Enter your account balance, risk per trade, and stop-loss distance to get a position size that keeps you inside it.
$10 per pip per 1.00 lot — standard for USD-quoted major pairs.
Recommended Position Size
2.50 lots
Dollar Risk Floor (target)
$500.00
Actual Risk at This Lot Size
$500.00
Rounded down to the nearest 0.01 lot, so you never risk more than your target.
Enter your account balance, the percentage you want to risk per trade, and your stop-loss distance to calculate the mathematical position size for your specified risk inputs. It rounds the lot down to the nearest 0.01 so the calculated position does not exceed your specified risk ceiling.
Frequently asked questions
How is the lot size calculated?
It divides your dollar risk (balance × risk %) by the dollar value of your stop-loss distance in pips/points, then rounds down to the nearest 0.01 lot so you never exceed your target risk.
Why round down instead of up?
Rounding down keeps the calculated theoretical risk at or below your target ceiling. Rounding up would calculate slightly more risk than you planned, which compounds across many trades.
Are pip values exact for my broker?
The built-in values are typical reference figures for standard contracts. Use the Custom / Other option and your broker's contract specification for exact values.