Position Sizing Made Simple: How Much Should You Risk per Trade?

Beginners spend most of their energy on where to enter. Professionals spend at least as much on how much to risk. The reason is simple: even a good strategy has losing streaks, and position size decides whether a losing streak is an annoyance or the end of the account.

Two traders can follow exactly the same signals and end the year very differently because one risked 1% per trade and the other risked 10%. Sizing is the part of trading you fully control, which makes it the most important skill to get right.

Start with the cash amount you are willing to lose on one trade. That is your account balance multiplied by your risk percentage. Then divide that cash amount by the loss per unit of size if the stop is hit.

Worked example in forex: your balance is $1,000 and you risk 1%, so the cash risk is $10. Your stop loss on EUR/USD is 20 pips away. On a standard lot, one pip on EUR/USD is worth about $10, so a 20-pip stop costs about $200 per standard lot. Your position size is $10 divided by $200, which is 0.05 lots. If the stop is hit, you lose about $10.

Different markets have different contract sizes and pip or point values, and brokers can differ, especially for gold and indices. Always confirm the contract specification for your broker. The free DONKOFX position size calculator does this arithmetic for you.

There is no single correct number, but there is a sensible range for most people. Risking 0.5% to 1% per trade is common guidance for beginners and for anyone running several automations at once. Experienced traders with a long, stable track record sometimes go higher; very few go above 2% on a single idea.

The right percentage is the one that lets you sleep. If a normal losing day would make you want to switch everything off, your risk is too high for you, whatever any rule of thumb says.

Losing streaks are not rare events; they are part of every strategy. The table below shows what ten losses in a row do at different risk levels, with each loss taken from the remaining balance.

After a loss you are working with a smaller balance, so the gain needed to return to where you started is larger than the loss itself. This is the single most important reason to keep risk small.

Per-trade risk controls one idea. It is not enough on its own, because several trades can be open at once and a bad day can produce several losses in a row. That is why DONKOFX uses three limits.

The trade or basket limit is the most a single setup can lose at its stop. The session limit is the loss at which one run of a bot stops itself, so a bad day cannot become a disaster while you are at work. The account exposure ceiling caps the combined open risk across every strategy, grid and copy automation on the same broker account. You set it once in Settings, Risk. A value of 0 leaves it unset; it accepts up to 50%. Even while it is unset, a grid basket is capped at 10% of the balance.

Before any automation starts, its start screen shows all three numbers side by side, and the Start button stays disabled if the new trade would not fit.

For Deriv digit and similar short contracts, the stake is the risk: if the contract loses, the stake is gone. Sizing is therefore about how many stakes a session can lose before it stops.

Recovery systems, which increase the stake after a loss, need extra care. Never judge them by the first stake. Add up every stake in the full recovery series, including rounding and broker minimums. That total is your real exposure, and it must fit inside your session limit. DONKOFX shows the full series cost before such a bot can start.

Running several automations is a sensible way to spread activity across different approaches, but risk adds up. Three bots each risking 1% per trade can have 3% of the account at risk at the same moment, and more if each manages several positions. If they all trade the same market in the same direction, a single price move can hit all of them together.

This is exactly what the account exposure ceiling is for. If you set it to 5%, DONKOFX adds up the open stop risk of every compatible automation on that broker account and refuses a new trade that would take the total above 5%. The activity log then names the limit that blocked the trade and the runs using the room, so a skipped trade is never a mystery.

Prop firm evaluations usually impose a daily loss limit and a maximum overall drawdown, and breaking either ends the evaluation. Size so that a bad day cannot reach the daily limit: if the firm allows 5% a day, a session limit of 2% to 3% leaves a buffer for slippage and for trades that close after the limit is reached.

Trailing drawdown rules, where the floor rises as the account grows, need special care because your room can shrink after a winning day. The free trailing drawdown calculator shows your current floor and remaining room.

Brokers only accept sizes in fixed steps, often 0.01 lots for forex and gold. When the calculated size falls between two steps, round down, so the real risk is slightly below your limit rather than above it. DONKOFX rounds down to your broker's step for this reason, and if even the broker's minimum size would risk more than you allowed, it refuses the trade with a message instead of quietly taking more risk.

A percentage-based risk adjusts itself: after a loss the cash risk per trade shrinks, and after a gain it grows. That is a feature, because it slows you down during a bad run. Fixed cash amounts do not adjust, so if you size in dollars rather than percent, recalculate them whenever your balance moves by more than about ten percent.

Resist the urge to step up the percentage after a winning month. Decide in advance, in calm conditions, what would justify a change, such as several months of results that match the strategy's expected behaviour, and stick to it.