Position Size Calculator
Decide how much to risk first, then let the stop distance tell you how many shares, contracts, lots or units that buys. Sizes always round down so the real risk never exceeds the plan.
Results
| Position size (shares) Rounded down so risk is never exceeded. | 50 |
|---|---|
| Dollars at risk Planned $100.00 (1.00% of account). | $100.00 |
| 1R One R is the dollars lost if the stop is hit at this size. | $100.00 |
| Stop distance $2.00 per share. | 2 |
| Notional at entry | $5,000.00 |
| % of account used at entry | 50.00% |
Sizes at 0.5%, 1% and 2% risk
| Risk | Dollars | Size (shares) |
|---|---|---|
| 0.5% | $50.00 | 25 |
| 1.0% | $100.00 | 50 |
| 2.0% | $200.00 | 100 |
Every input is in the URL, so anyone opening this link sees the same numbers.
How it's calculated
Futures need the contract tick size and tick value; forex needs the pip size and the pip value per lot (use the pip value tool if unsure).
| Risk in dollars | account × risk% / 100, or the fixed dollar amount |
|---|---|
| Risk per unit | |entry − stop| for shares and crypto; distance / tickSize × tickValue for futures; distance / pipSize × pipValue for forex |
| Position size | floor(risk dollars / risk per unit); lots to 0.01, crypto to 0.000001 |
| Dollars at risk | size × risk per unit (never more than planned, because size rounds down) |
| Notional | size × entry (× point value for futures) |
Educational only, not financial advice. The maths is simple arithmetic on the numbers you enter; it knows nothing about your broker, fees, slippage or the market. Questions about the maths? Ask in the forums.