Risk Management
Protecting capital comes before growing it
Risk management is the actual skill
Most new traders focus on finding the perfect entry. Experienced traders and investors focus on how much they stand to lose if they're wrong, because being wrong is unavoidable, and how you survive it determines whether you're still in the game to be right next time.
The reason this gets so little attention is that it feels unproductive. Finding a better setup feels like progress. Deciding in advance how much you will lose feels like admitting defeat. But entries are the part you control least, and position size is the part you control completely, which is why the second one determines outcomes far more than the first.
The math of drawdowns
Losses and the gains needed to recover them are not symmetric, and the gap grows sharply as losses get larger. This single asymmetry is the foundation of everything else on this page.
Account falls by
Gain needed to break even
5%
5.3%
10%
11.1%
20%
25%
30%
42.9%
50%
100%
70%
233%
A 10% loss is an inconvenience. A 50% loss requires doubling what remains just to return to where you started, which for most strategies means years. This is why avoiding large losses matters more than capturing large wins: the damage from a deep drawdown is not the money itself but the time required to undo it.
Position sizing
Risking a fixed, small percentage of your account per trade, commonly between 0.5% and 2%, means no single loss can meaningfully damage your account. This is exactly what StopLossFX's calculator is built to help you do: turn a risk percentage and stop loss distance into the correct position size, every time.
The mechanism matters. You decide the percentage first, then the stop loss distance based on where the idea is invalidated, and the position size falls out of those two numbers. Doing it in the opposite order, choosing a position size that feels right and placing a stop wherever it fits, means your risk changes trade to trade without you deciding it.
Same risk, different sizes
An account of $10,000 risking 1% puts $100 at stake per trade, always.
If the stop is 20 pips away, that allows a larger position. If the setup requires a 60 pip stop, the position must be a third of the size. The amount lost when wrong is identical either way, which is the entire point.
What ten losses in a row actually do
Position sizing is easiest to understand by looking at what a bad run does at different risk levels. The strategy is the same in every case. Only the size changes.
Account remaining after 10 losses in a row
2% per trade
81.7% left
5% per trade
59.9% left
10% per trade
34.9% left
25% per trade
5.6% left
The trader risking 2% needs a 22% gain to recover. The one risking 25% needs roughly 1,700%, which is another way of saying the account is gone. Same ten losses, same strategy, entirely different outcome.
Notice that the difference is not linear. Doubling risk from 2% to 5% roughly doubles the damage, but going from 10% to 25% moves you from a recoverable position to an account that no realistic run of wins can restore. This is why professional risk limits look conservative to beginners: they are sized for the streak, not for the average.
Losing streaks are normal, not evidence of failure
A run of consecutive losses feels like proof that something broke. Usually it is just what randomness looks like at a given win rate, and it should be planned for rather than reacted to.
60% win rate
About 6 losses in a row
50% win rate
About 8 losses in a row
40% win rate
About 10 losses in a row
Approximate longest streak to expect across roughly 200 trades. These are normal outcomes of randomness, which is why position sizing has to assume they will happen rather than hoping they will not.
The practical consequence is that a losing streak is not a signal to increase size to recover faster, nor to abandon a strategy that is behaving within its expected range. The time to evaluate a strategy is across a meaningful sample of trades, not in the middle of a drawdown when the decision will be made emotionally.
Win rate alone tells you nothing
A 90% win rate sounds excellent and can still lose money if the occasional loss is large enough to erase many small wins. A 35% win rate sounds poor and can be highly profitable if the wins are several times the size of the losses. What matters is the combination of how often you win and how much you make when you do.
Two profitable-looking strategies
Strategy A wins 90% of the time, making $100 per win and losing $1,200 on the rare loss. Across 100 trades: 90 wins for $9,000, 10 losses for $12,000. Net result -$3,000.
Strategy B wins 35% of the time, making $400 per win and losing $150 per loss. Across 100 trades: 35 wins for $14,000, 65 losses for $9,750. Net result +$4,250.
This is why a reward-to-risk ratio is recorded alongside the outcome of every trade in a journal. Without it, a win rate is just a number that tells you how often something happened, not whether it was worth doing.
Diversification that isn't
Holding several positions is not the same as spreading risk. If they tend to move together, you have one position in several accounts, and you find out only when they all decline at once.
This is easy to miss in practice. Several currency pairs sharing the same base currency are largely the same bet. Multiple technology stocks respond to the same interest rate news. Even seemingly unrelated assets tend to correlate more strongly during a crisis, which is precisely when the diversification was supposed to help.
The workable version is to cap total exposure to anything that shares a driver, rather than counting positions. Three trades each risking 1% on instruments that move together is a 3% risk, and should be treated as one.
Limits that stop a bad day getting worse
Position sizing controls single trades. It does nothing about the sequence where a loss produces frustration, frustration produces a larger trade, and that trade produces a much bigger loss. That pattern needs a separate limit.
- A daily loss limit, after which you stop trading regardless of what setups appear.
- A weekly or monthly drawdown level at which you reduce size until performance stabilises.
- A rule for what happens after a rule is broken, since the trade after a violation is often the worst one.
These work because they are decided in advance, when nothing is at stake. Set during a losing day, the limit will always be one more trade away.
Diversify what you risk
Don't risk your entire trading capital on a single instrument, and don't treat your investing money and trading money as one pool. Trading capital should be money you can afford to lose without affecting your long-term financial plan.
Keeping them separate protects both. It stops a difficult trading period from consuming money meant for retirement, and it stops long-term investments from being sold to fund short-term positions. It also makes performance honest, since a trading account topped up from savings can look profitable while the household is losing money overall.
Risk beyond the markets
The same thinking applies to finances generally, where the largest risks are usually not investment risks at all. A single income source, no emergency fund, or missing insurance can each do more damage than any market decline, and none of them are affected by how well a portfolio is constructed.
The common structure is worth noticing. In every case the question is the same: what is the worst plausible outcome, could you absorb it, and what does reducing it cost? Position sizing, an emergency fund, and insurance are three answers to that one question, applied at different scales.