Risk unit before entry price
Decide how much one full stop may cost before you look for a level to buy or sell.
Most desks start with a chart and an opinion. The size field comes last. That order is why a “small” trade still hurts: the stop was far, the coin count stayed familiar, and the loss in currency was never written down.
A risk unit flips the order. Before you hunt for an entry, write the maximum you will lose if the stop is hit — in won or dollars, not in coins. That number might be half a percent of equity on quiet days and less when the book is already busy. The point is that it exists before price.
When the stop distance is known in price terms, size becomes arithmetic: risk unit divided by distance per coin (or per contract). The Smart Crypto Calculator PC habit of feeding equity, risk percent, and stop distance is useful only if those three inputs are honest. A risk unit makes the first two honest; the chart makes the third.
Try this on your next idea: hide the size field until the stop is marked and the currency loss is agreed with yourself. If the resulting size feels “too small,” the market is telling you the stop is wide for your account — not that you should inflate the unit.