Risk, Position Sizing and Drawdown.

Here is how most beginners place a trade. They see a setup, feel good about it, pick a lot size that feels right, and then put the stop somewhere that does not cost too much. That is backwards, and it is why their stops keep getting hit by normal noise.

Here is how I want you to do it. First, find the price where your trade idea is wrong. That is your stop. Second, decide how many dollars you are willing to lose if that price is reached. That is your risk. Only then, third, work out the position size that makes those two numbers fit together. If the size comes out smaller than you hoped, that is the answer. If it comes out smaller than the smallest size the platform allows, you pass on the trade.

This order matters because the market does not care where you need your stop to be. It only cares where the idea is wrong. Your job is to fit your size to the market, not the other way round.

Risk per trade is the amount you will lose if your stop is hit. Most experienced traders express it as a percentage of the account, so it scales with the account instead of staying fixed.

For learning, I suggest somewhere between 0.25% and 1% of the account per trade, with 0.5% as a sensible middle. On a $10,000 account, 0.5% is $50. On a $25,000 account, 0.5% is $125 and 0.4% is $100. These may feel small. That is the point. Small risk is what lets you survive long enough to find out whether your method works.

You will see people online say 2% is standard. On a $10,000 account that is $200 a trade, and ten losses in a row would cost about 18% of the account. We will look at why that matters in a moment. Two percent is not insane, but it is the top of the range, not the starting point.

One more definition. When this unit says stop distance, it means the number of pips between your entry and your stop. When it says pip value, it means the dollars per pip for one standard lot, which you learned to calculate in Unit 4: $10 for EUR/USD, and 1,000 yen divided by the price for USD/JPY.

There is one formula to remember: position size in lots = dollar risk ÷ (stop distance in pips × pip value per lot).

The bit in brackets is the loss per lot: how much one standard lot would lose if the stop is hit. Divide your dollar risk by that, and you get how many lots you can afford.

Two rules go with it. Always round down, never up. And leave a small allowance for costs and slippage, because a stop can fill a pip or two worse in a fast market, and commission is charged win or lose.

R stands for your initial risk on a trade. If you risked $50, then 1R is $50. A trade that loses the full stop is -1R. A trade that makes $100 is +2R. A trade that makes $25 is +0.5R.

Thinking in R does two useful things. First, it lets you compare trades on different account sizes or with different stop distances on equal terms. Second, it takes some of the sting out of dollar figures. A -1R loss is a planned, budgeted event. A -3R loss on a trade where you meant to risk 1R is a process failure, and R makes that impossible to hide.

Expectancy is the average R you would expect per trade over many trades, if your past results are a fair guide. The formula is: (win rate × average win in R) minus (loss rate × average loss in R).

Drawdown is how far your account has fallen from its highest point, called the peak, to its lowest point since, called the trough. It is usually written as a percentage of the peak.

Here is the part that surprises people. Losses and gains are not symmetrical. If you lose 10%, you need 11.1% to get back. Lose 20% and you need 25%. Lose 50% and you need 100%, which means doubling what is left. The formula is: gain needed = loss ÷ (1 minus loss). For a 30% loss that is 0.30 ÷ 0.70 = 42.9%.

This is why risk control matters more than finding winners. Small drawdowns are recoverable with ordinary trading. Big ones need extraordinary results, and needing extraordinary results is what pushes traders into the oversized, emotional trades that make things worse.

Even a method with a positive average will have runs of losses. They are not a sign that something broke. They are what randomness looks like. If your win rate is 45%, the chance of any particular five trades all losing is 0.55 × 0.55 × 0.55 × 0.55 × 0.55, which is about 5%. That sounds rare, but over a few hundred trades it will happen many times. A rough rule of thumb puts the longest losing run you should expect in 100 trades at around 7 or 8 with a 45% win rate.

So ask yourself: what does 8 losses in a row do to my account? At 0.5% risk, about 3.9%. At 1%, about 7.7%. At 2%, about 14.9%. At 5%, about 33.7%, which needs a 51% gain just to get back. The streak is the same. Your risk setting decides whether it is a bad week or the end of the account.

The feeling during a streak is the dangerous part. After three or four losses, most traders feel an urge to win it back fast, either by trading more or trading bigger. That urge is normal and you will feel it. Plan for it now, while you are calm. On OA Funded, doubling up after losses in a martingale style is banned, but the reason to avoid it is the same everywhere: it turns a normal streak into a catastrophic one.

Write these down before your next session. They are your rules, set lower than any limit a platform or firm gives you, so you have a buffer.

Risk per trade: a fixed percentage, for example 0.5%. Daily stop: a maximum loss for the day, for example 3 losing trades or 1.5% of the account, whichever comes first. Drawdown step-down: if the account falls 4% from its peak, halve risk per trade until you have recovered half of that. Pass rule: if the size needed is below the platform minimum, or the stop would have to be squeezed to fit, you do not take the trade.

Firm limits are a different thing. If you trade a prop evaluation, it will have its own loss limits, and on OA Funded those are covered in Unit 6 and Unit 8. Treat those as the cliff edge, and keep your personal guardrails well back from it.