You have a thousand euros in your account. You see a trade you like. How much of that thousand should you be ready to lose on it?
Many new traders never ask this question. They pick a size that feels right. That feeling is the main reason small accounts blow up.
What does "risk per trade" mean?
Your risk on a trade is the money you lose if price hits your stop. The stop, short for stop loss, is the price where you get out because the trade was wrong.
Risk is not the size of your position. You can buy a large position with a stop very close and risk little. You can buy a small position with a stop far away and risk a lot. Risk is the loss if the stop is hit.
What is the one percent rule?
It means you never lose more than one percent of your account on a single trade.
With a thousand euros, one percent is ten euros. Each trade is set up so that hitting the stop costs ten euros, no more.
The rule is not a law, and nobody enforces it. It is a starting point that many trading educators and journals recommend, because it keeps any single trade from hurting you badly.
Why stay so small?
Because losing streaks are longer than people expect, and big losses are hard to repair.
Streaks. Even a way of trading that works will hand you runs of losses. If you win about four trades in ten, a run of eight or more losses in a row is normal over a few hundred trades. At one percent per trade, eight losses cost you around eight percent. At five percent per trade, the same run costs you about a third of the account.
Recovery. This is the part most people get wrong. Losses and gains do not balance out evenly.
Say your account drops from a thousand euros to five hundred. You lost half. To get back to a thousand, you need to make five hundred on an account of five hundred. That is a gain of all of it: you have to double what is left.
A small loss is easy to recover. Lose a tenth, and you need a bit more than a tenth back. Lose half, and you need to double. The deeper you fall, the steeper the climb.
Small risk per trade keeps you in the shallow end, where recovery is still realistic.
Is two percent too much?
For a beginner, often yes. For an experienced trader with a long record, it can be fine.
The question to ask is not "what do others risk?" but "what happens to me in a bad run?" Picture ten losses in a row. At two percent, that costs about a fifth of the account. Would you keep trading the same way after that, calmly? If the honest answer is no, your risk is too big for you.
Prop firm challenges make this sharper. They often have a daily loss limit and an overall limit. A couple of losses at high risk can end the challenge in a single morning. Journaling a prop firm challenge explains those rules.
How do you work out your position size?
Decide the risk in money first. Then let the stop tell you the size.
Here is the idea in words. You have a thousand euros and want to risk ten. Your stop is a certain distance from your entry. You pick the size where that distance, times the size, comes to ten euros. A stop further away means a smaller size. A stop closer in means a bigger size. Your risk stays ten euros either way.
Many brokers and trading platforms have a position size calculator that does this for you. The important part is the order: risk first, stop second, size last. Never pick the size first and then squeeze the stop to fit.
Should you risk the same on every trade?
For most traders, yes, at least at the start. A fixed risk keeps your results easy to read. Every full loss costs the same, so you can compare trades fairly.
Traders who measure their results in R do exactly this. R is your result in units of risk: win twice what you risked and that trade is two R. With the same risk every time, R and money move together, and your journal stays honest.
Changing your risk based on how confident you feel is risky. Confidence is a feeling. Your journal can show you whether your "sure" trades really did better. What to track in a trading journal covers which fields make that check possible.
Two more questions
Should I risk more when I am more confident?
Only if your own record shows your confident trades actually do better. Check that before you act on the feeling.
Does risk per trade matter if I have a good strategy?
Yes. A good strategy still has losing streaks. Your risk decides whether you survive them long enough for the strategy to pay.
Read next:
- How Do You Write a Trading Plan? A Beginner's Start
- Trailing vs Static Drawdown in Prop Firms, Explained
EdgeFlow records the entry, stop, size and result of every trade. It shows your results in R, so you can see whether your risk stayed steady. Per account, you can set a maximum drop in percent. How much to risk stays your call; EdgeFlow only keeps the record honest. More on how it works.