Most beginners focus on finding entries. Experienced traders tend to focus on how much they can lose. Risk management does not guarantee profit, but it determines how long you can keep learning before a string of losses ends your account. This article covers the basic calculations.
Risk per trade
The most common rule of thumb is to risk a small fixed percentage of your account on each trade. Many educators suggest one percent or less, though no number is correct for everyone. The point of a small number is that a losing streak does not become catastrophic.
For example, with an account of 100,000 and a 1% risk limit, you would accept a maximum loss of 1,000 on a single trade.
Position size formula
Once you know the amount you are willing to lose and the distance to your stop, you can calculate size:
Position size = amount at risk ÷ (stop distance × value per unit of movement)
Suppose you risk 1,000, your stop is 25 pips away, and one pip is worth 10 per standard lot. Then 1,000 ÷ (25 × 10) = 4 lots. The calculation works backwards from the stop, so the stop is chosen first, based on where your idea is wrong, and the size follows.
The common mistake is the reverse: choosing a size you like and then placing the stop wherever it fits.
Stop placement
A stop belongs where the trade idea is invalidated, not where the loss feels comfortable. If the logical stop is far away, the answer is a smaller position, not a tighter stop that will probably be hit by normal noise.
Be aware of slippage and spreads. In fast markets, a stop can fill at a worse price than you set. This is one reason to size with a margin of safety.
Reward-to-risk ratio
If you risk 1 unit to make 2, you need to win only a little more than one trade in three to break even before costs. If you risk 1 to make 0.5, you need to win more than two in three. A good ratio cannot rescue a poor method, and a high win rate cannot rescue a poor ratio. Costs such as spread, commission and swap reduce both.
Drawdown arithmetic
Losses are harder to recover from than they appear:
- A 10% loss needs an 11% gain to recover.
- A 25% loss needs a 33% gain.
- A 50% loss needs a 100% gain.
This asymmetry is the main reason to keep per-trade risk small and to set a daily or weekly loss limit.
Total exposure
Several open trades on correlated instruments can behave like a single large trade. Buying EUR/USD and GBP/USD, for example, often means being short the dollar twice. Count correlated trades together when thinking about total risk.
Leverage
Leverage lets you control a larger position than your capital would otherwise permit. It magnifies gains and losses. High leverage is a common cause of rapid account loss among beginners. Choose leverage and size so that a normal stop-out costs only your planned amount.
A basic risk plan
- Maximum risk per trade (for example, 1%).
- Maximum loss per day and per week; stop trading when reached.
- Maximum number of open trades or total open risk.
- Rules for moving a stop (for example, only in the direction of the trade).
- A written rule for what you do after a losing streak.
Final reminder
You can lose some or all of the money you trade. Only use capital you can afford to lose, and speak to a licensed adviser about your own circumstances.
This article is educational and is not investment advice.