What each number means
Position size is how much you trade. Risk amount is the planned loss at the stop loss. Margin is collateral for a leveraged position.
Understanding all three helps you read your setup without mistaking exposure or margin for the amount you plan to lose.
One setup and three different numbers
Assume a linear BTC contract, capital of 1,000 USDT, entry of 100,000 USDT, stop of 99,000 USDT and chosen risk of 1%. Ignore fees, spread, slippage and execution differences.
| Number | Meaning | Example |
|---|---|---|
| Quantity | Amount in the trade | 0.01 BTC |
| Position value | Exposure valued at entry | 1,000 USDT |
| Planned risk | Price-movement loss at stop | 10 USDT |
| Illustrative initial margin at 10× | Simplified collateral | 100 USDT |
A position worth 1,000 USDT does not imply a planned loss of 1,000 USDT. A margin figure of 100 USDT does not establish a 100 USDT loss limit.
What happens when the stop gets wider?
Keep planned risk at 10 USDT and entry at 100,000 USDT. If the stop changes to 98,000 USDT, the distance doubles to 2,000 USDT.
Simple quantity falls to 0.005 BTC, giving a position value of 500 USDT at entry. The planned price-movement loss remains 10 USDT under the same assumptions.
Why leverage needs a separate check
Leverage changes margin requirements and can affect liquidation. It does not replace choosing position size from risk and stop distance. Execution, liquidation and costs can cause the actual outcome to differ from the stop-loss calculation.
Before taking the entry
- Confirm instrument, contract type and account currency.
- Check quantity or lot units, entry and stop-loss prices.
- Review minimum increments and costs.
- For leveraged positions, check margin mode and liquidation conditions.