Position Size Calculator
The only risk lever you fully control. Enter your account, your risk tolerance, and your stop — get the exact size that keeps every loss the same predictable amount.
Your trade
The formula, in one line
Notice what's not in this formula: your conviction, the setup's "quality," or how sure you feel. Position size is pure arithmetic. The moment you override it because a trade feels special is the moment risk management stops protecting you.
Frequently asked questions
Why size by risk instead of by lots or dollars?
Because it makes every loss the same predictable fraction of your account, regardless of the instrument or the stop distance. Fixed lots means a wide-stop trade quietly risks several times more than a tight-stop one — sizing by risk removes that inconsistency.
Does leverage change my position size?
No. Leverage changes the margin your broker sets aside, not the size the math prescribes. Risk decides size; leverage only decides how much of your balance gets locked up while the trade is open — that is exactly what the margin metric shows.
Where do the pip values come from?
Standard contract conventions: $10 per pip per standard lot for USD-quoted majors, $10 per 0.1 move per 100-oz gold lot. For unit-based instruments the calculator works directly in price points. The price field is editable because notional and margin depend on it.