Position Sizing for Swing Traders

How swing traders should size positions: accounting for wider stops, overnight gap risk, correlation across open trades, and total portfolio heat.

Educational content, not financial advice. Trading involves risk — always verify figures and consult a professional before trading.

Swing trading — holding positions for days to weeks — changes the sizing maths in ways day traders don’t have to worry about. Wider stops, overnight gaps, and several open positions at once all mean the simple “1% per trade” rule needs a few adjustments. This guide covers them.

Start with the same foundation

The core rule still holds: decide your risk per trade first, then derive position size:

Shares = (Account × Risk%) ÷ (Entry − Stop)

The Position Size Calculator does this in one step. What’s different for swing traders is which numbers you plug in and how many trades you stack on top of each other.

Swing stops are wider — so positions are smaller

Day traders use tight intraday stops; swing traders have to survive multi-day swings, so stops sit further from entry. A wider stop means a larger per-share risk, which means fewer shares for the same dollar risk.

Same $100 risk, very different position. Resist the urge to keep the day-trade share count with a swing stop — that silently multiplies your risk eightfold.

Account for overnight gap risk

Holding overnight (and over weekends for crypto) exposes you to gaps — the price can open far past your stop on news or earnings. Practical defenses:

• Risk a bit less per trade (e.g. 0.5–1% rather than 2%) since the stop is less reliable.
• Avoid holding through known events like earnings unless that’s your strategy.
• Treat the stop as “where I’ll usually get out,” not a guarantee.

Watch your total portfolio heat

This is the big one. Risking 1% on one trade is fine. But if you have eight swing trades open, each risking 1%, you’ve got 8% of the account at risk at once — and if they’re correlated (all tech longs, all crypto), a single bad day can hit them together.

Track total open risk (“heat”). A common cap is 4–6% of the account across all open positions. If adding a trade would push you past that, either skip it or trim another. Sizing each trade in the Position Size Calculator and adding up the ”$ at risk” figures tells you your current heat.

Correlation quietly stacks risk

Two longs in the same sector aren’t really two trades — they’re closer to one big trade. When positions are correlated, count them closer to a single risk unit and size accordingly. Diversifying direction and theme keeps a single market move from hitting everything at once.

Putting it together — a swing checklist

1. Set the stop where the thesis breaks (give it room for multi-day swings).
2. Risk a conservative % per trade (0.5–1%) given gap risk.
3. Size with the calculator so the loss matches that %.
4. Check the trade clears your risk/reward minimum.
5. Add the new ”$ at risk” to your open trades — stay under your heat cap.

Key takeaways

• Wider swing stops mean smaller positions for the same dollar risk.
• Overnight gaps make stops less reliable — risk a little less per trade.
• Cap total open risk (portfolio heat) around 4–6%, not just per-trade risk.
• Correlated positions stack risk; count them closer to one trade.

Next steps

• Size each trade with the Position Size Calculator.
• Place stops that survive swings with the Stop Loss / Take Profit Calculator.
• Filter setups with the Risk/Reward Calculator.