Risk management is the least popular subject in trading and the one that decides outcomes. Every rule below is derived from arithmetic rather than caution, which is why they are not negotiable.
Risk a fixed small percentage of the account per trade (commonly 0.5% to 2%) and size every position from that percentage and your stop distance. Add a daily loss limit and a weekly one. The reason is arithmetic: losses and recoveries are asymmetric, so a 50% drawdown needs a 100% gain to undo, and a positive edge with too much risk per trade still ends accounts.
Decide in advance what fraction of the account a single trade may cost (1% is the common default) and derive the position size from it and the stop distance every time. The formula is on the position size calculator.
Why a percentage rather than a fixed lot size: the percentage scales automatically. As the account grows, position sizes grow with it; as it shrinks, they shrink, which slows the bleed during a bad run instead of accelerating it.
Why it must not depend on conviction: the trades you feel most certain about are not reliably the ones that win, and sizing up on conviction means your largest losses arrive on the trades you were most sure of. Constant sizing removes the correlation between your confidence and your damage.
| Risk per trade | After 10 straight losses | Gain needed to recover |
|---|---|---|
| 0.5% | −4.9% | +5.1% |
| 1% | −9.6% | +10.6% |
| 2% | −18.3% | +22.4% |
| 5% | −40.1% | +67.0% |
| 10% | −65.1% | +186.5% |
Ten consecutive losses is not a disaster scenario. It is a Tuesday for a strategy winning six trades in ten.
A 50% loss requires a 100% gain to recover, because the gain is earned on a smaller base. The relationship accelerates: 75% down needs 300% up, 90% down needs 900%.
Every risk rule that sounds excessively cautious is derived from this curve. Capping per-trade risk, capping daily losses, cutting size during a drawdown. All of them exist to keep you on the flat part of it. The drawdown calculator makes it concrete for your own numbers.
There is also a non-mathematical version. Most accounts are not liquidated; they are abandoned. A trader 40% down usually stops before the market finishes the job, because sitting in a deep drawdown while trading the same plan is psychologically brutal. Keeping drawdowns shallow keeps you in the game long enough for the edge to matter.
Per-trade risk does not protect you from yourself. Three losses in a morning and the urge to make it back immediately is strong, and it is exactly then that position sizes creep and stops get skipped.
The defence is a rule set when you are calm:
The numbers matter less than the existence of the rule. What it converts is an open-ended emotional spiral into a bounded, survivable loss.
Long EUR/USD, long GBP/USD and short USD/CHF at 1% each looks like 3% spread across three trades. It is not. All three are short the US dollar, so a dollar rally moves all three against you simultaneously. That is one 3% trade with extra commission.
Practical handling:
The most counterintuitive result in this subject: a strategy with a genuine positive edge can still lose everything. Expectancy describes the average over infinite trades. Ruin is about the path. Risk enough per trade and a perfectly ordinary losing streak removes your ability to keep trading before the average has a chance to assert itself.
Run your own win rate and reward-to-risk through the risk of ruin calculator, then change only the risk-per-trade figure from 1% to 5%. The change in the outcome is the entire argument for this page.
Trading foreign exchange and other leveraged instruments carries a high level of risk and can result in the loss of some or all of your capital. Signals and educational content provided in MarketPro are for informational purposes only and do not constitute investment advice, a recommendation, or a solicitation to trade. Past performance is not indicative of future results. You are solely responsible for your own trading decisions. Only trade with money you can afford to lose, and seek independent advice if necessary.
Every MarketPro signal carries an explicit stop, which is what makes sizing it possible before you click. One free every day.
Not investment advice. Past performance is not indicative of future results.