Risk management in trading is a short set of rules, written before the trade, that cap how much you can lose on one trade, in one day and in one run of bad luck. Four numbers do most of the work: the share of your account risked per trade, the position size that follows from it, the reward you aim for against that risk, and the drawdown you will not go past. This page explains each, shows how they connect on one worked example, and links to the detailed guide and calculator for every step.
The four numbers that make up a risk plan
| Rule | The question it answers | Go deeper |
|---|---|---|
| Risk per trade | How much of the account can one trade lose? | How much to risk per trade |
| Position size | How many contracts or shares fit that risk? | Position size calculator |
| Reward against risk | What do I need to win to make the trade worth taking? | Risk-reward calculator |
| Loss limits | When do I stop for the day, and what drawdown ends the plan? | Max drawdown |
1. Risk per trade: a fixed share of the account
Pick a fixed percentage of your balance that one trade is allowed to lose. Many traders use between 0.5% and 2%. The exact figure matters less than keeping it fixed, because a fixed percentage shrinks your dollar risk after losses and grows it after gains. The full reasoning, and how a funded account's drawdown rule lowers the figure, is in how much should you risk per trade.
2. Position size: turn the percentage into contracts
Position size = (account × risk %) ÷ (stop distance × value per point), rounded down
On a $25,000 account risking 1%, the budget is $250. If one contract risks $100 to your stop, you can take two contracts and not three. Round down every time: rounding up turns a 1% rule into a larger one without you noticing. The position size calculator has the tick values for the main futures contracts built in.
3. Reward against risk: what the trade has to pay
The risk-reward ratio compares what you stand to make with what you stand to lose. It only means something next to your win rate. The win rate you need to break even is 1 ÷ (1 + R), where R is the reward per unit of risk:
| Reward : risk | Break-even win rate |
|---|---|
| 1 : 1 | 50.0% |
| 2 : 1 | 33.3% |
| 3 : 1 | 25.0% |
A 40% win rate at 2 : 1 earns 0.4 × 2 − 0.6 × 1 = +0.2R per trade on average. The same win rate at 1 : 1 loses 0.2R. That per-trade average is expectancy; see expectancy vs profit factor for how to read it, and how many trades you need before the numbers are worth trusting.
4. Loss limits: a daily stop and a drawdown line
A per-trade rule does not stop a bad day from compounding. Add two limits above it:
- A daily loss limit. A common version is two to three times your per-trade risk. At 1% per trade, stopping after a 3% loss means three full losses end the session, not seven.
- A drawdown line. Decide in advance the max drawdown at which you cut size or stop and review. Funded accounts set this for you, and whether it is measured at the close or intraday matters; see end-of-day vs intraday drawdown.
Why the risk per trade has to stay small
Losses compound, so a streak costs less than the sum at small size and far more at large size. Here is a run of ten losses in a row on a $25,000 account at three risk levels:
| Risk per trade | Balance after 10 losses | Drawdown | Gain needed to recover |
|---|---|---|---|
| 1% | $22,610 | 9.6% | 10.6% |
| 2% | $20,427 | 18.3% | 22.4% |
| 5% | $14,968 | 40.1% | 67.0% |
Ten straight losses is uncommon but well within reach over a few hundred trades, especially for a system that wins 40% of the time. The Monte Carlo simulator reshuffles your own results to show the streaks they can produce. Pushing risk per trade up buys little extra return and makes the recovery maths far worse. The extreme case is risk of ruin, the chance of losing so much you cannot continue.
Risk management on a prop firm account
On a funded or evaluation account the firm's rules are the binding limit, and they can end the account at a much smaller loss than your own plan would. Work backwards from the firm's limit: divide the drawdown room you have by the number of losses in a row you want to survive, and risk that much per trade. The prop firm drawdown calculator finds the floor for static and trailing rules, and ExpectancyIQ for prop traders covers tracking them across accounts.
Common risk management mistakes
- Sizing from the account balance you wish you had. Use the real balance; see why your broker balance doesn't match your journal.
- Widening the stop to fit a bigger position. The stop comes from the trade, the size from the stop.
- Raising size after a winning run. A streak can be luck; see the winning streak trap.
- Doubling up to win a loss back. It breaks the fixed-percentage rule at the moment it is hardest to keep.
- Writing the rules but never checking them. A rule you cannot measure is a hope.
Check that you followed your own rules
Record the risk you took on every trade as an R-multiple and review it as a series. Drift shows up there: a run of trades where 1R quietly became 2R, or a day that went past your limit. Import your trades into ExpectancyIQ and the dashboard shows your drawdown and results against the plan you meant to follow.