Position Sizing in Crypto: How to Calculate Your Trade Size Step by Step
“How much should I buy?” is the most common question beginners ask — and most answer it with a feeling. Position sizing replaces the feeling with one short formula.
Key takeaways
- Decide your risk in dollars first, then find the position size that matches your Stop Loss.
- Position size = Risk in $ ÷ Stop distance in %.
- A wider Stop Loss means a smaller position — never the other way around.
- Never move your Stop Loss to make a bigger position “fit”.
The formula
You need three numbers: your account size, the % you are willing to risk (usually 1–2%, see how much to risk per trade), and the distance from your entry to your Stop Loss.
2. Stop distance % = (Entry − Stop Loss) ÷ Entry
3. Position size ($) = Risk in $ ÷ Stop distance %
4. Quantity = Position size ÷ Entry price
Worked example: BTC on the 4-hour chart
- Account: $2,000, risk 1% → $20
- Entry: $60,000 · Stop Loss: $58,500 → stop distance = 1,500 ÷ 60,000 = 2.5%
- Position size = $20 ÷ 0.025 = $800
- Quantity = $800 ÷ $60,000 = 0.01333 BTC
If the Stop Loss is hit, you lose about $20 (1% of the account). With a Take Profit at $63,000 (+5%), the gain would be about $40 — a 2:1 reward-to-risk. Round-trip trading fees of about 0.2% on $800 add roughly $1.60.
Notice that you did not invest your whole account, and you did not need to. The position is exactly as large as your risk rule allows.
Why the stop decides the size
The Stop Loss should sit where your trade idea is proven wrong — usually beyond the last swing low (for a long) or swing high (for a short), adjusted for how much the coin normally moves. That location comes from the chart, not from your wallet.
Once the stop is set, the position size follows. A volatile altcoin may need a stop 15–20% away; with the same $20 risk that means a position of only $100–$130. A calm large-cap might need 2–3%, allowing a much larger position. Same risk, different sizes.
| Stop distance | Position for $20 risk | Share of a $2,000 account |
|---|---|---|
| 1% | $2,000 | 100% |
| 2.5% | $800 | 40% |
| 5% | $400 | 20% |
| 10% | $200 | 10% |
| 20% | $100 | 5% |
Four common mistakes
1. Confusing position size with risk
“I only put in $100” says nothing about risk. With no Stop Loss, all $100 is at risk. With a stop 5% away, $5 is.
2. Moving the stop to fit a bigger position
Wanting to buy $1,000 and then placing the stop just 2% away so the math “works” is backwards. A stop that sits inside normal price noise gets hit for no reason — and trading fees become a big share of a tiny risk (see how fees eat short timeframes).
3. Positions bigger than the account
A very tight stop can produce a position larger than your capital. On Spot you simply cannot buy more than you have, so your real risk is smaller than planned. Reaching that size requires leverage — and with leverage, liquidation can happen before your Stop Loss is ever reached.
4. Sizing up after a loss
Doubling the position to win back a loss turns a normal losing streak into a disaster. The formula stays the same after a win and after a loss.
Let the calculator do it
SetupVerdict Pro has two calculator modes. Simple shows what a chosen amount would gain or lose at the Take Profit and Stop Loss. Position size works the other way round: enter your account and your risk %, and it returns the exact position and coin quantity for the current setup — with a warning when the stop is very wide or the position would exceed your capital.
Put the rules on autopilot
SetupVerdict checks trend, momentum, location, trend strength and risk on 4H and 1D candles, then gives you one verdict with Entry, Stop Loss, Take Profit and a position-size calculator. The free tool needs only a free account — no card required.
Educational content only — not financial advice. Crypto-assets are volatile and you can lose money, including all of it. Examples are illustrative and use round numbers; real results depend on prices, fees and your own decisions.