Why must you recalculate your position size when you double your stop-loss distance?
Stop-loss distance and position size are part of the same risk equation. CME’s position management materials make the sequence clear: first identify where your trade thesis is invalidated, then decide how much risk you’re willing to take, and finally calculate your position size.
Here’s a hypothetical example, excluding fees: if you plan to risk $100 and the difference between your BTC entry price and stop-loss price is $1,000, your position size would be 0.1 BTC. If a new trade setup requires a $2,000 stop-loss distance, the same risk budget only supports a 0.05 BTC position.
If you keep the position size at 0.1 BTC, the expected loss from the price move becomes $200. The price may simply have a little more room to move, but the risk to your capital has doubled.
I separate “where my thesis is proven wrong” from “how much I’m willing to risk at most,” then use position size to connect the two. Don’t keep moving your invalidation point after a loss just to preserve your original position size, and still call it the original plan.
This calculation applies to BTC, ETH, and SOL, but the actual position size also depends on contract specifications and minimum order sizes. Fees, gaps, and slippage can also cause actual losses to exceed your budget.
A wider stop-loss may be appropriate for a different trade setup; it means you need to recalculate your position size, not that you automatically get to risk more.
$BTC $ETH $SOL
Tap my profile picture to view my live trades
Stop-loss distance and position size are part of the same risk equation. CME’s position management materials make the sequence clear: first identify where your trade thesis is invalidated, then decide how much risk you’re willing to take, and finally calculate your position size.
Here’s a hypothetical example, excluding fees: if you plan to risk $100 and the difference between your BTC entry price and stop-loss price is $1,000, your position size would be 0.1 BTC. If a new trade setup requires a $2,000 stop-loss distance, the same risk budget only supports a 0.05 BTC position.
If you keep the position size at 0.1 BTC, the expected loss from the price move becomes $200. The price may simply have a little more room to move, but the risk to your capital has doubled.
I separate “where my thesis is proven wrong” from “how much I’m willing to risk at most,” then use position size to connect the two. Don’t keep moving your invalidation point after a loss just to preserve your original position size, and still call it the original plan.
This calculation applies to BTC, ETH, and SOL, but the actual position size also depends on contract specifications and minimum order sizes. Fees, gaps, and slippage can also cause actual losses to exceed your budget.
A wider stop-loss may be appropriate for a different trade setup; it means you need to recalculate your position size, not that you automatically get to risk more.
$BTC $ETH $SOL
Tap my profile picture to view my live trades
