2x / 3x ETF Position Sizer

With leveraged ETFs, more is not better — you size the maximum position you can survive first. Most people lose on leverage not because they got direction wrong, but because the position was too large: one deep drawdown forces them out at the bottom. This tool draws that ceiling two ways: the age rule (intuitive — age as a proxy for risk capacity) and Quarter-Kelly (mathematically optimal, taken at a conservative quarter of full Kelly).You get both numbers — take the smaller one.