Inputs
How far your stop-loss is from your entry price
1× — Spot trading, no leverage
Position Size
$2,000
Risk Amount
$100
Margin Required
$2,000
Account % Used as Margin
20.0%
How Position Sizing Works
Position Size = (Account × Risk %) ÷ Stop-Loss %
This formula ensures that no matter what your stop-loss distance is, the maximum dollar amount you lose is always the same — your predetermined risk amount.
Example: Spot Trade
- Account: $10,000 · Risk: 1% · SL: 5%
- Risk amount: $10,000 × 1% = $100
- → $100 ÷ 0.05 = $2,000 position
- If stopped out: lose exactly $100 (1% of account)
Example: 5x Futures
- Account: $10,000 · Risk: 1% · SL: 1%
- Risk amount: $10,000 × 1% = $100
- → $100 ÷ 0.01 = $10,000 position
- → Margin required: $2,000 at 5x leverage
Why Position Sizing Is the Most Important Trading Skill
Most beginner traders obsess over finding the perfect entry, the right indicator, or the winning strategy. But academic research and decades of professional trading experience point to the same conclusion: position sizing determines whether a trading strategy survives or fails, not the strategy itself.
Consider this: a strategy with a 40% win rate and 1:3 risk-reward ratio is mathematically profitable. But if you risk 20% of your account per trade, a common streak of 5 consecutive losses (which happens regularly with a 40% win rate) would wipe out your account. The same strategy with 1% risk per trade would survive that same losing streak with only a 5% drawdown.
The Math of Ruin
Recovery from losses requires exponentially larger gains:
| Account Drawdown | Gain Needed to Recover | Difficulty |
|---|---|---|
| 5% | 5.3% | Easy — 1-2 winning trades |
| 10% | 11.1% | Manageable — a normal week |
| 20% | 25% | Challenging — takes discipline |
| 30% | 42.9% | Hard — weeks to months |
| 50% | 100% | Very hard — need to double your account |
| 75% | 300% | Nearly impossible to recover |
| 90% | 900% | Account is effectively dead |
Position Sizing Across Different Account Sizes
| Account | 1% Risk | Position (5% SL) | Position (2% SL) |
|---|---|---|---|
| $500 | $5 | $100 | $250 |
| $1,000 | $10 | $200 | $500 |
| $5,000 | $50 | $1,000 | $2,500 |
| $10,000 | $100 | $2,000 | $5,000 |
| $50,000 | $500 | $10,000 | $25,000 |
| $100,000 | $1,000 | $20,000 | $50,000 |
Smaller accounts result in very small position sizes. This is intentional — small accounts should trade smaller. The temptation to "make it big fast" by over-sizing positions is the #1 reason small accounts get wiped out.
Position Sizing with Leverage
A critical misconception is that leverage automatically increases risk. In reality, leverage changes capital efficiency, not inherent risk — when combined with proper position sizing and stop-losses.
❌ Wrong: Max Size, High Leverage
- Account: $10,000 · Leverage: 20x
- Position: $200,000 (all margin used)
- No stop-loss
- → 5% move = account gone
✅ Right: Calculated Size
- Account: $10,000 · Risk: 1% ($100)
- Stop-loss: 2% · Position: $5,000
- 5x leverage, $1,000 margin
- → Stopped out: $100 loss = 1%
Common Position Sizing Mistakes
❌ Risking a Fixed Dollar Amount Instead of a Percentage
As your account grows or shrinks, a fixed dollar risk becomes disproportionate. Always use percentages — they scale automatically.
❌ Ignoring Correlated Positions
Long BTC, long ETH, and long SOL aren't 3 independent 1% risks. During a crash, all correlate and you face 3% combined risk.
❌ Sizing Based on "Feel"
Buying "$500 worth of BTC" without calculating stop-loss distance or account risk percentage is gambling, not trading.
❌ Increasing Risk After Winning Streaks
Keep risk percentage consistent. Let position sizes naturally grow as your account grows — that's the compound effect of proper risk management.
Frequently Asked Questions
What is position sizing in crypto trading?+
What is the 1% rule?+
How does leverage affect position sizing?+
Should I always use the same risk percentage?+
What's the difference between position size and margin?+
How do I position size for crypto vs stocks?+
Can position sizing prevent blowing up my account?+
What is the Kelly Criterion?+
Derivatives & Leveraged Products — Important Risk Warning
Derivatives are complex financial instruments that carry a high risk of rapid capital loss. Leveraged trading (futures, perpetual contracts, margin trading, options) can result in losses that exceed your initial investment. The majority of retail investor accounts lose money when trading derivatives.
You should carefully consider whether you understand how derivatives work and whether you can afford to take the high risk of losing your money. This content is for educational purposes only and does not constitute financial advice, investment advice, or a recommendation to trade derivatives.
In the European Union, crypto derivatives are classified as financial instruments under MiFID II. Only platforms with appropriate MiFID II authorization may offer these products to EU residents. Regulatory treatment varies by jurisdiction — verify the legal status of derivatives trading in your country before participating.