Position Size Calculator
Convert a risk percentage into a number of units, given where your stop sits.
Result
- Position size (units)
- 20
- Amount at risk
- 100
- Risk per unit
- 5
- Position value (notional)Notional / account size
- 2,000
- Notional / account size
- 0.2×
Formula
amount at risk = account size × risk % ÷ 100risk per unit = |entry − stop|units = amount at risk ÷ risk per unitnotional = units × entry
Assumptions and limits
- The stop is assumed to fill at the price you entered. Gaps and slippage can make the real loss larger.
- Fees, funding and spread are excluded — use the fee calculator for those.
- It says nothing about whether the trade is a good idea, only what size matches the risk you specified.
- Notional above your account size implies leverage, which magnifies both directions.