Position size and risk calculator

• What you risk is your capital times the percentage. The quantity is that risk divided by what you lose per unit if the stop is hit: the distance from entry to stop plus the entry and exit fees. That way, if the stop is hit, you lose what you chose, fees included.
• The stop fills exactly at its price. In reality, a stop market order can fill at a worse price if the market gaps, especially on news or in low liquidity.
• Minimum leverage is the notional divided by your capital: what you'd need using all your capital as margin. If it comes out below 1x, your capital is enough.
• The perpetual funding rate isn't included; it's paid or received every few hours while the position stays open.

What you lose if the stop is hit. A trade with a 3 R ratio wins three times what it risks if it hits the take profit.

It's your call. Many people use a fixed rule, often between 0.5 and 2 % per trade, so a losing streak doesn't empty the account: risking 1 %, ten losses in a row leave the account at around 90 %.

No, if you keep the quantity and the stop: what you lose depends on position size and distance to the stop. More leverage locks up less margin, but liquidation gets closer, and with very high leverage it can come before the stop.

Yes, for buys: if the minimum leverage is 1x, you can buy that quantity on spot with your capital and set the stop at the same price.