In one linePosition size answers: “How large can this trade be while keeping my planned dollar risk the same?”
Start with risk, not lot size
A common mistake is opening 0.50 lot, 1 lot or 2 lots simply because the number feels normal or the broker allows it.
The better order is:
1. Account→2. Dollar risk→3. Stop distance→4. Position size
A simple USD example
Example
Account: $10,000
Risk: 1% = $100
Stop distance: 25 pips
$100 ÷ 25 = $4 per pip
On EUR/USD, when USD is the quote currency, a standard lot is approximately $10 per pip.
So $4 per pip is approximately 0.40 standard lot.
What if the stop is wider?
If the planned dollar risk stays at $100 but the stop becomes 50 pips:
$100 ÷ 50 pips = $2 per pipThe position must become smaller.
This is the key relationship:
- Wider stop → smaller position.
- Narrower stop → larger position, if the same dollar risk is maintained.
Why a calculator helps
Pip value is not identical for every pair and account currency. The calculator handles the conversion so you do not have to guess.
Related toolPosition Size CalculatorCalculate your position size →
Remember this
- Choose dollar risk first.
- Choose the stop from the trade idea.
- Calculate lot size last.
Educational content.
This lesson is provided for general educational and informational purposes and is not personal financial or investment advice.