Pillar guide
Risk Management for Traders
Analysis decides which trades you take. Risk management decides whether you're still trading in two years. Here's the arithmetic, from first principles, with nothing hand-waved.
The one idea underneath all of it
Every technique in this guide exists to serve a single objective: stay solvent long enough for your edge to show up.
Trading results arrive lumpily. Even a genuinely profitable strategy produces losing streaks, and they cluster. A strategy that wins 50% of the time will hand you ten consecutive losses roughly once in every thousand trades, which for an active trader is a few years away.
Risk management is what lets you sit through that streak and carry on afterwards. Losses are the cost of doing business. Your job is to keep every single loss, and every plausible run of them, inside what your account can absorb.
Position sizing: the decision that matters most
Position sizing is the only variable you control completely. You can't control whether a trade wins. You can control, precisely and in advance, what it costs you when it loses.
The method starts at the loss you'll accept and works back to a share count:
- Risk budget = account balance × risk percentage
- Risk per share = |entry − stop| + costs
- Position size = risk budget ÷ risk per share
On a $25,000 account risking 1%, with an entry at $72.60 and a stop at $64.00: $250 ÷ $8.60 = 29 shares. The position size calculator does this instantly, including fees and reward targets.
Choosing the percentage
| Risk per trade | After 10 straight losses | After 20 straight losses |
|---|---|---|
| 0.5% | 95.1% | 90.5% |
| 1% | 90.4% | 81.8% |
| 2% | 81.7% | 66.8% |
| 5% | 59.9% | 35.8% |
| 10% | 34.9% | 12.2% |
Look at the 10% row. Twenty losses, an unpleasant but entirely ordinary streak, leaves 12% of the account. Recovering from there takes a 720% gain, which is another way of saying that account is finished.
Stop losses: where, and why there
A stop loss marks the price at which your reason for being in the trade stops being true.
That distinction decides placement. If you bought because a support level held, the stop belongs below that level, because a close beneath it means support didn't hold and the whole thesis is gone. If you bought on a hammer, the stop belongs below the hammer's low, because that's where the buyers who created the pattern got overwhelmed.
A stop placed at "5% below entry" has no relationship to the idea you're testing. Ordinary noise will take it out while the thesis is intact, and it'll be too wide on some trades and too tight on others, at random.
The rules that make stops work
- Set it before you enter. Once you're in a position, your judgement about where it belongs stops being neutral.
- Never widen it. Widening converts a planned loss into an unplanned one at the exact moment the evidence says you were wrong.
- Tightening is fine. Moving a stop to protect profit is a different action with a different logic.
- Give it room for noise. A stop sitting just below an obvious round number or swing low is the first place a probe goes looking.
R multiples and expectancy
R is the amount you risked on a trade. Expressing results as multiples of R makes every trade comparable regardless of size: +2R means you made twice what you risked, whether that was $50 or $5,000.
Expectancy is your average result per trade, in R:
Expectancy = (Win rate × Average win in R) − (Loss rate × Average loss in R)
A strategy winning 40% of the time with 2R winners and 1R losers: (0.40 × 2) − (0.60 × 1) = +0.20R per trade. Risking $250, that is $50 per trade on average, or $5,000 over a hundred trades, arriving unevenly.
If expectancy is negative, nothing else helps. Better discipline, smaller size and more patience only change how long the account takes to die. The risk/reward calculator gives you the win rate any given ratio needs just to break even.
Track losses larger than 1R
In a well-run process, almost every loss should land close to −1R. A loss of −2R or −3R means something failed in execution: the stop was moved, ignored, or gapped through. The first two are discipline problems you can fix this week. The third is a sizing problem. Either way, a journal kept in R multiples surfaces it immediately. Use the stock profit calculator to convert each closed trade into R.
Drawdown: the maths of getting back to even
Gains and losses aren't symmetrical, and the asymmetry accelerates:
| Drawdown | Gain required to recover |
|---|---|
| 5% | 5.3% |
| 10% | 11.1% |
| 20% | 25.0% |
| 30% | 42.9% |
| 50% | 100% |
| 75% | 300% |
This table is the entire argument for cutting losses early. A 10% drawdown is a bad month. A 50% drawdown means doubling the account just to get back to where you started, and you have to do it with half the capital you had when you were performing well.
Set a maximum drawdown that triggers action before you need it. Plenty of professionals use 20% as a warning and 25–30% as a hard stop, which means halving position sizes and reviewing every assumption.
Portfolio heat and correlation
Risking 1% per trade leaves six open positions risking 6% between them, because the sum is what's at stake if the market moves against all of them at once. That total is your portfolio heat, and most frameworks cap it between 5% and 6%.
Correlation makes this worse than it looks. Five positions in the same sector aren't five independent bets. In a sector-wide selloff they behave like one large position. The practical adjustments:
- Cap total open risk at a fixed percentage and stop taking new trades when you reach it.
- Count correlated positions as one. Three semiconductor names sharing one thesis should share one risk allocation.
- Watch market-wide exposure. In a broad decline, correlations across everything converge towards one.
A rule set you can follow
Write them down, check them before every entry, and don't renegotiate while a position is open:
- Risk 1% of equity per trade. Recalculate the dollar figure once a month.
- Cap total open risk at 5%. Once you reach the cap, the next trade waits.
- Every trade has a stop in place before entry.
- Stops move one way only, and that way is tighter.
- Minimum 1.5:1 reward-to-risk, measured against real chart structure.
- Halve size at a 15% drawdown. Stop and review at 25%.
- Record every trade in R. Review anything worse than −1R.
Treat these numbers as a starting point and adjust them to your strategy and temperament. The one part that isn't adjustable is having them written down before you need them. Rules invented mid-drawdown aren't rules.
Risk management FAQs
What is the 1% rule in trading?
The 1% rule caps what you risk on any single trade at 1% of your account equity. On a $25,000 account that's $250 a trade. The cap applies to your loss if the stop is hit, so the position itself can be far larger than $250.
Where should I put my stop loss?
At the price that proves your reason for the trade was wrong. If you bought because a support level held, the stop belongs below that level. Pick an arbitrary distance instead and you've tied your exit to something the idea has no connection with, so ordinary noise takes you out while the thesis is still perfectly intact.
What is a good maximum drawdown?
Most professionals treat 20% as a serious warning and 25-30% as a hard stop that triggers a full review. It's pure arithmetic. A 20% drawdown needs a 25% gain to recover, a 30% drawdown needs 43%, and a 50% drawdown needs 100%.
How many positions should I hold at once?
Fewer than most beginners assume, because your real constraint is total risk. If each trade risks 1%, six positions put 6% of your account at stake when everything hits its stop together, and correlated names in the same sector do that routinely.
Can I widen my stop if the trade goes against me?
No. Moving a stop further away swaps a planned loss for an open-ended one, and it does that at the exact moment the evidence is telling you you're wrong. Almost every account-ending loss starts with a stop that got widened once, then widened again.