What does "capital" mean in trading? Three things share the name
The word capital is used for three different things: what you deposited, what you can afford to lose, and what you risk on a single trade. Confusing them is the direct cause of most accounts emptied in the first month.
Last updated: September 7, 2026
The three, and each is a different number
- The deposit - what you transferred to the broker. This is the balance you see.
- Risk capital - what you could lose entirely without anything in your life changing.
- Risk per trade - what you actually lose if your stop is hit on one position.
These are three numbers, not one. And anyone who makes them a single number - depositing everything they have and risking all of it on one trade - is not trading. They are betting.
The third number is the one that decides
The rule professionals agree on: never risk more than 1% to 2% of the account on a single trade.
Why that number in particular? Because it makes a losing streak survivable:
- At 2% risk - ten losses in a row take 18% of the account. Painful, and recoverable.
- At 10% risk - the same ten losses take 65%. To recover you must now triple what is left.
- At 20% risk - five losses are enough to end the account in practice.
And ten losses in a row is not rare bad luck. It happens to every trader, whatever their strategy.
Why what is lost is not easily won back
Loss and gain are not symmetrical. Someone who loses 50% needs 100% to get back to where they started, not 50%.
That alone explains why protecting capital matters more than chasing profit: the hole is dug far faster than it is filled.
And capital is not only money
There is a second kind that never appears on a statement: your ability to take a loss without acting on the feeling.
Someone trading with money they need - rent, a loan, borrowed money - loses that capital first. They close the winner early out of fear and hold the loser out of hope. And the outcome has nothing to do with the quality of their analysis.
Which is why the first question is not "how much do I need?" but "what amount would not hurt to lose?"
In short
Decide the three numbers before your first trade, and write them down. Then size every position against the third, not the first.
The position size calculator on this site does that arithmetic for you: enter your balance, your risk percentage and your stop distance, and it gives you the size. No sign-up.
See also: How much capital do you need to start trading?
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