Most position size calculators don’t include leverage directly because leverage affects margin required, not the actual risk per trade. Position size is normally based on account size, risk percentage, and stop‑loss distance. Leverage just determines if you have enough margin to open that position.
If you want a calculator that factors in leverage, try using one built into trading platforms like MT5 on Valetax. It will show both the position size and the margin needed based on your chosen leverage, so you can see exactly how much of your account will be tied up before placing the trade.