How big, and what it costs to be on.
Two calculators either side of the same question. The first turns a stop into a size. The second adds up the spread, the commission and the slippage, and divides by the risk, which is the only form the number means anything in.
Position size
The stop is a price, because a level is a price. Everything else follows from the distance to it.
Size from the expected move
The chain says what a normal day is worth. A stop inside that is noise, a stop far beyond it is expensive. This places it as a fraction of the move instead of by feel.
What it costs to get on
Half the spread each way, both commissions, and whatever slippage you actually see. Measured against the risk, because dollars hide the size of the leak.
Everything here is descriptive market-structure context. Not investment advice, not a signal, no performance promise. Past structure does not predict future prices. Trading involves substantial risk of loss.