Risk management:
size before entry
You can be right about direction half the time and make money. You can be right seventy percent of the time and go broke. The difference is not in the analysis: it is in how much you risk on each trade.
This is the part of the job with no mystery, that you can learn in an afternoon, and that almost nobody follows. Here are the numbers, the calculation and the three rules that survive everything.
The arithmetic of losses
Losses and gains are not symmetrical, and this is the first thing to burn into your head. If you lose a percentage of the account, the percentage you need to get back to even is larger, and it grows fast.
| If you lose | You need to gain | To get back to even |
|---|---|---|
| 10% | 11.1% | Recoverable in a few weeks |
| 20% | 25% | Already hard |
| 30% | 42.9% | A good quarter |
| 50% | 100% | Double the account. Almost nobody does |
| 80% | 400% | In practice, you do not come back |
This is why the first rule is not to make money: it is not to dig a hole you cannot climb out of.
How much to risk per trade
The long-standing reference is between 0.5% and 2% of the account per trade. For someone starting out, 1% is a good number and 2% is already aggressive.
It is not plucked from the air: it is the number that stops a normal bad streak changing your life. At 1%, ten losses in a row leave you at 90% of the account and you can still think straight. At 5%, they leave you at 60% and your head no longer works the same: you start trading to recover, which is the beginning of the end.
Translated into money
On a $2,000 account, 1% is $20 per trade. It sounds like nothing. It is, and that is why it works: your goal in year one is not to make money, it is to still be here next year with the account intact and a hundred trades logged.
Losing streaks are not bad luck
Ten losses in a row happen. It is not that you got unlucky, it is basic statistics.
If you are right half the time, the chance of stringing ten losses at any specific point is about one in a thousand. Sounds remote. But if you take five hundred trades a year, you have five hundred chances for that streak to show up. It will show up.
The right question is not how to avoid the streak. It is what is left of your account when it arrives. And that is decided by size, not analysis.
What usually happens instead
Nobody takes ten losses at the same size. What happens is that around the sixth or seventh you double up to win it back in one go, and the streak of ten small losses becomes one big one that takes the quarter. It has a name and it has been studied.
Position sizing in three steps
It is done before you enter, not after. Three numbers and one division.
- How much you are willing to lose. $2,000 account at 1% = $20.
- Where your stop is. If you enter at 21,500 and the stop goes at 21,480, that is 20 points.
- Divide. On the Micro Nasdaq each point is $2, so 20 points is $40 per contract. With $20 of risk, you cannot even take one contract.
That last line is the hardest one to accept and the one that saves the most money. If the size does not fit, the trade does not happen. Either you tighten the stop, if the chart allows it without putting it in the middle of the noise, or you wait for another one.
| Account | Risk at 1% | 10 point stop | 20 point stop | 40 point stop |
|---|---|---|---|---|
| $1,000 | $10 | Does not fit | Does not fit | Does not fit |
| $2,000 | $20 | 1 micro | Does not fit | Does not fit |
| $5,000 | $50 | 2 micros | 1 micro | Does not fit |
| $10,000 | $100 | 5 micros | 2 micros | 1 micro |
Using the Micro Nasdaq at $2 per point. "Does not fit" means that trade does not happen with that account.
The three rules that survive everything
1. The stop goes on before you enter
Before, not after. After, you are negotiating with yourself with money on the line, and you lose that negotiation every time. If your platform lets you attach the stop to the entry order, do it that way and take the decision off your plate.
2. A daily loss limit
Two or three times your per-trade risk and the day is over. No exceptions. The day you make an exception is the day it costs you a month.
3. Never average down intraday
Adding to a losing position turns a small mistake into a big one. It is the number one way to blow an account and the easiest to justify in the moment: "if it was good at 21,500, at 21,470 it is better". No. If you were wrong, now you are more wrong with twice the size.
Risk to reward, without the mysticism
The risk to reward ratio is not a moral rule, it is arithmetic. The only thing that matters is that it fits your win rate.
| If you risk 20 to make | You need a win rate of | Comment |
|---|---|---|
| 20 (1:1) | 50% plus costs | Very demanding for a beginner |
| 40 (1:2) | 33% | One in three. The most common |
| 60 (1:3) | 25% | Few trades and a lot of patience |
| 10 (2:1) | 67% | Two out of three. Hard |
Before costs. With costs, every percentage goes up.
The daily limit, the one that really saves you
Of all the rules, the one that saves the most accounts is not the per-trade stop: it is the daily limit.
The reason is that big losses almost never come from one trade. They come from an afternoon: you lose two, you get annoyed, you enter with no reason, you lose another, you raise size to recover, and in ninety minutes you have done a month of damage. The daily limit cuts that chain at the second link.
How to set it
- Two or three times your per-trade risk. At $20 a trade, between $40 and $60 a day.
- Count it in money, not trades. "Three losses and I stop" can be gamed by cutting size.
- Close the platform. Do not leave it open "just watching".
- Log it. A day you break the limit is a data point about you, not an accident.
And an honest test: if you break the limit in a simulator, you will definitely break it live. That is what paper trading is actually good for.
Why it fails even when you know it
Everything above is high school arithmetic. People understand it first time and break it anyway, because when a position is losing the brain stops calculating.
Kahneman and Tversky measured it forty years ago: the pain of losing weighs about twice the pleasure of gaining the same amount. That is why a red position gets held longer than the plan says, and why closing at a loss is so hard even when the plan says to.
The way to stop it failing is not more willpower. It is automating the decision before there is money on the line:
- Fixed size worked out before you look at the chart.
- Stop attached to the entry order.
- Daily limit written down and followed as if someone else set it.
- Repeat until it is boring, which is when it is actually learned.
And when you go live, use the smallest size that exists. The full order is here.
Frequently asked questions
How much should a beginner risk per trade?
1% of the account is the sensible reference. If your account is small and 1% does not cover a single contract, the conclusion is not to raise the risk: it is that the trade does not fit yet, or that you need a smaller instrument.
Is a wide stop or a tight stop better?
Neither: the stop goes where your idea stops being valid. What you adjust afterwards is the size, not the stop. Putting the stop close so you can take more contracts is doing it backwards and is a classic mistake.
What risk to reward ratio should I use?
None is better in the abstract. What matters is that it fits your win rate: at 1:2 you need to be right one time in three, at 2:1 two times in three. You only find out your real win rate by logging trades.
When should I increase size?
After statistics, not after a good day. A hundred logged trades with the same rule, and if the result holds up, one step. Increasing after a hot streak is the fastest route to giving it all back.
Does the Kelly criterion work for trading?
As an idea yes: optimal size depends on your edge. As a formula applied to intraday trading, almost never, because it needs your true win probability and you do not have that number with a hundred trades. In practice it produces sizes that are far too aggressive.
Where can you practise risk management without losing money?
In any simulator with a loss limit that actually throws you out. If it cannot throw you out, you are not practising the important part. Every BullHero room has one and you see it on screen while you trade.
Sources
- Kahneman and Tversky, Prospect Theory (1979): why losing weighs more than winning.
- CME Group, Micro E-mini Nasdaq-100: point value used in the calculations.
- Chague, De-Losso and Giovannetti, Day Trading for a Living? (2020).
- Odean, Are Investors Reluctant to Realize Their Losses?
- CFTC, investor advisories on leverage and futures trading.
You follow a limit when you can see it
Every room shows its max loss on screen and puts you out if you break it. Three minute rounds, play money.
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