Trading cost is a per-trade figure. What leaves the account is that figure multiplied by how many times you trade. The first number is set by the venue and the coin. The second is set by you, and it is usually the larger lever.
The multiplication
Take whatever one round trip costs you as a share of the position. Multiply by the number of round trips in a month. The result is the share of your traded capital that went to cost before any trade was right or wrong. Do it for a year and the figure is often larger than traders expect, because each single cost felt too small to count.
The arithmetic is simple. The reason it gets skipped is that no statement shows it. A markup is inside each price and a commission is a small line on each receipt. Nothing adds them up for you.
Turnover, not time
What matters is how many times the capital turns over. A trader who makes one trade a month with the whole account and a trader who makes twenty pay very different amounts on the same balance. The second trader has to earn back many times the cost to end the month level.
This is the honest way to describe the difference between holding and trading. A holder pays the round trip once and spreads it over a long move. An active trader pays it again on every idea.
A cost budget
One useful habit is to treat cost as a budget. Decide what share of the account you are willing to spend on cost in a month. Divide it by the cost of one round trip at your usual size. The answer is a number of trades. That number is the month’s allowance, and it turns an abstract cost into a count you can keep.
A budget also changes how a marginal trade looks. If the allowance is limited, a weak idea has to compete with the better idea that may arrive next week. Without a budget, every trade looks free at the moment it is placed.
Why crypto makes it worse
A stock trader’s frequency is capped by the session. A crypto trader has no cap. The market is open every hour of every day, so the number of possible trades is limited only by attention. Overtrading is the default in a 24/7 market covers the behavior. The cost multiplication is the bill for it.
The two levers
Monthly cost falls if the cost per trade falls or if the count falls. Cost per trade depends on the coin and the venue, and it differs more between coins than most traders assume. The NoVo Crypto Market Map ranks what a round trip costs on each coin from Robinhood’s own disclosed markup, which gives the first number. The count is in your own trade history. Cost as a share of the move covers what each single trade has to clear.