Position size before the click: a KRW loss cap that fits

Decide the maximum KRW you are willing to lose on the next idea while the order ticket is still empty. Write that number above the pair name.

Convert the loss cap into units using your invalidation price — the level where the thesis is wrong, not where you feel uncomfortable. Units = loss cap ÷ distance to invalidation (in KRW per unit).

Check the result against your cash buffer and against any single-name weight limit from your allocation table. If the sized order would breach either line, shrink the units; do not stretch the stop.

Tape a three-line checklist beside the monitor: loss cap, units, weight after fill. Position sizing for desktop users fails most often when the checklist is skipped because the chart looks urgent.