How to size a crypto position so one trade cannot ruin you

Most people who lose money in crypto do not lose it because their analysis was bad. They lose it because a position was too large for the account it sat in, so an ordinary adverse move became an unrecoverable one. That is a solvable problem, and solving it requires no forecasting ability at all.

Start with the arithmetic, because it decides everything else

A loss and the gain required to undo it are not symmetrical, and the gap widens fast:

Loss taken	Gain needed to recover
20%	25%
50%	100%
60%	150%
80%	400%
90%	900%

At the top of that table you are inconvenienced. At the bottom you are effectively finished, because a 900% gain is not something you can plan around. This is why drawdown is the number experienced traders watch rather than returns: a strategy that makes 40% in good conditions and loses 70% in bad ones is a losing strategy, however impressive the good years look.

Crypto makes this sharper than other markets because volatility is larger. A daily move that would be a notable session in equities is an ordinary afternoon here. The same position size therefore carries substantially more risk, and position sizing habits imported from slower markets tend to be too aggressive.

Size from your stop, not from your conviction

The common approach is to decide how much you want to put in — often a round number, often driven by how good the idea feels — and then place a stop somewhere that looks reasonable. That is backwards, because the size is being set by emotion and the stop by convenience.

The alternative has three inputs and one output:

1. Account risk

What percentage of your trading capital are you willing to lose if this trade is wrong? Not your net worth — the capital you are actually trading. Many experienced traders keep this at or below 1% per position. We are deliberately not going to name a number for you, because it depends on circumstances we cannot see. What we will say is that larger percentages shorten how long you survive a losing streak, and losing streaks are not optional.

2. Stop distance

Where does price have to go for the idea to be wrong? Not “where does a loss start to hurt” — those are different questions, and conflating them is how people end up with stops that get hit by noise. If the level that invalidates your thesis is far away, that is information: it means this trade requires a smaller position, not a tighter stop.

3. Entry

Where you actually get in. The distance between entry and stop is your risk per unit.

Then the size falls out of it: position size = (account × risk percentage) ÷ (entry − stop). Our position size calculator does this, and also gives you the reward-to-risk ratio if you supply a target.

Worked through: a $10,000 account, 1% risk, entry at $60,000 and a stop at $57,000. You are willing to lose $100. Risk per unit is $3,000. So you can hold 0.0333 units — about $2,000 of exposure. If you had instead decided to “put $5,000 in”, the same stop would cost you $250, or 2.5% of the account, and you would not have known that until it happened.

Reward to risk, and why it filters more than it seems

Once you know your risk per unit, a target tells you what you are being paid to take it. A setup offering $2 of upside for $1 of risk is 2:1. Below roughly 1.5:1 you need to be right a great deal of the time simply to cover fees and the occasional bad fill — and most people are not right that often.

This is a useful filter precisely because it is unemotional. It rejects trades that feel compelling but do not pay enough, which is a category most traders have too many of.

The assumption that can still hurt you

Everything above assumes your stop fills at your stop price. In crypto that is not guaranteed. Books thin out precisely when you need them, prices gap, and during a violent move a stop can fill considerably worse than where it sat — so a real loss can exceed the figure any calculator gives you. Read our entries on slippage and liquidity, and treat the calculated risk as a floor rather than a ceiling.

Leverage compounds this. A leveraged position can be liquidated — closed by the venue, at the venue’s speed, with your collateral gone — before any recovery is possible. No position-sizing arithmetic protects you from that, because liquidation is not a stop you control.

Two habits that cost nothing

First, decide in advance what would make you exit for reasons other than price: a broken assumption, a change in the project, a rule change. “It is down” is not information, and without a non-price exit condition you will hold things for the wrong reasons.

Second, size on the assumption that several positions could go wrong simultaneously. Crypto assets correlate heavily in a selloff — a portfolio of ten ideas that look unrelated frequently behaves as one during a bad week. If every position is sized at your maximum individually, your portfolio risk is a multiple of what you think it is.

Frequently asked questions

What risk percentage should I use?

That is genuinely your decision and depends on your circumstances, your timeframe and how many positions you hold at once. We will not name a figure. The relationship worth knowing is that the larger it is, the shorter the losing streak you can absorb.

Does this work for long-term holding rather than trading?

The sizing arithmetic applies to anything where a total loss is possible, which includes holding. The stop-based version is trading-specific, but the underlying question — how much of this can I lose without it mattering — is the same.

Should I use leverage if I size correctly?

We do not make recommendations. What we can tell you is that leverage introduces liquidation, which removes your control over the exit, and that this is a different category of risk from the one position sizing addresses.