How to size crypto positions when 15% daily moves are normal — the dollar-risk formula adapted for crypto’s extreme volatility, worked examples in units, and why the 1%–2% rule is non-negotiable.
Key Takeaways
- Position size (units) = Dollar Risk ÷ (Entry Price − Stop Price).
- Crypto’s wide stops mean far fewer units at equal dollar risk than stocks.
- Risk 1%–2% of account equity per crypto trade — volatility makes more catastrophic.
- Size from the stop, not from conviction or a target unit count.
- The TradeRiskMath crypto calculator returns exact units and dollar risk.
Why Crypto Sizing Is Different
The position-sizing formula is the same as for stocks — dollar risk divided by per-unit risk. What changes in crypto is the size of the stop. A stock trader might use a 5% stop; a crypto trader routinely uses 10%–20% stops because anything tighter is noise. Wider stops mean fewer units at equal dollar risk, which is the whole point: the formula keeps your dollar risk constant regardless of how volatile the asset is.
The Crypto Sizing Formula
Position Size (units) = (Account Equity × Risk %) ÷ (Entry Price − Stop-Loss Price).
The numerator is your dollar risk. The denominator is what you lose per unit if the stop is hit. Because crypto prices and stops are both large in percentage terms, the unit count that results is often small — and that is correct.
Worked Example: Bitcoin
Account: $20,000. Risk: 1% = $200. Entry: $60,000. Stop: $54,000 (10% stop).
- Per-unit risk = $60,000 − $54,000 = $6,000
- Position size = $200 ÷ $6,000 = 0.0333 BTC
- Capital deployed = 0.0333 × $60,000 = $2,000 (10% of account)
- Dollar risk = 0.0333 × $6,000 = $200 (exactly 1%)
A $20,000 account risking 1% on a 10% Bitcoin stop buys about 0.033 BTC. Notice that you deploy $2,000 but risk only $200 — the stop, not the capital deployed, defines your real risk. A wider 20% stop would halve the position to 0.0167 BTC at the same $200 risk.
Worked Example: A Volatile Altcoin
Account: $20,000. Risk: 1% = $200. Entry: $2.00. Stop: $1.60 (20% stop).
- Per-unit risk = $2.00 − $1.60 = $0.40
- Position size = $200 ÷ $0.40 = 500 tokens
- Capital deployed = 500 × $2.00 = $1,000 (5% of account)
- Dollar risk = 500 × $0.40 = $200 (exactly 1%)
The 20% altcoin stop produces a smaller capital deployment ($1,000) than the 10% Bitcoin stop ($2,000) at the same dollar risk. The formula automatically de-risks more volatile assets — exactly what you want.
Why the 1%–2% Rule Is Non-Negotiable in Crypto
Crypto drawdowns are brutal and fast. A 50% account drawdown requires a 100% gain to recover; a 20% drawdown needs 25%. Risking 10% per trade in a market where losing streaks of 8–10 are common is a recipe for a 65%+ drawdown from which recovery is statistically unlikely. The 1%–2% rule is what makes crypto trading a survivable multi-year activity rather than a short bet.
Putting It Into Practice
The TradeRiskMath crypto calculator handles the formula for any coin or token. Enter your account equity, risk %, entry, and stop — it returns the exact unit count, total capital at risk, dollar risk, and a leverage warning if the position is too large for the account.
Frequently Asked Questions
How do I size a crypto trade?
Position Size (units) = (Account Equity times Risk %) divided by (Entry Price minus Stop-Loss Price). Because crypto stops are wide, the unit count is often small; that is correct.
Why are crypto position sizes so small?
Because crypto stops are wide (often 10% or more of price), dividing your dollar risk by a large per-unit risk gives a small unit count. Holding the 1% to 2% rule sacred keeps you safe.
Should I use the same stop for Bitcoin and an altcoin?
No. Size from each asset’s actual volatility; an ATR-based stop on a meme token is far wider than on Bitcoin. Treating them the same is a costly mistake.
What is the 1% to 2% rule in crypto?
Cap the loss on any single trade at 1% to 2% of account equity. In a market where 20% moves are normal, this rule is the only thing between you and a blow-up.
Where can I calculate crypto position size?
The TradeRiskMath Crypto calculator applies the formula for you. Open it from the Crypto hub.
The Bottom Line
Crypto position sizing is the same formula as stocks, applied to much wider stops. Size from dollar risk, accept the small unit counts that wide crypto stops produce, and hold the 1%–2% rule sacred. In a market where 20% moves are normal, your sizing discipline is the only thing between you and a blow-up.
Related tools
Open Crypto Calculator Crypto Volatility Risk Crypto Risk Hub
Educational Disclaimer
This article is provided strictly for educational purposes and does not constitute financial, investment, or trading advice. Trading stocks, options, futures, forex, and crypto involves substantial risk of loss. Always evaluate trades against your own financial situation and risk tolerance, and consult a licensed professional before making investment decisions. Past performance does not guarantee future results.