How Much Should You Risk Per Trade?
At a glance
- There is no correct number, but there is correct arithmetic: after n straight losses the equity left is (1 − risk%)n — pick the percentage with that table in front of you.
- Twenty losses in a row leave 90.46% at 0.5% risk, 81.79% at 1%, 66.76% at 2%. Losing runs are normal at any win rate; the percentage decides what one costs.
- Drawdowns are asymmetric: recovering needs 1/(1 − loss) − 1 — 20% down needs 25% back, 50% down needs 100%, 70% down needs 233.3%.
- Fixed lots vs fixed percentage: as the balance shrinks, a fixed 0.50 lots is carried by less equity so the risk share grows; a fixed percentage recalculates the budget every trade.
- The percentage only converts balance into a cash budget; the size itself comes from the position size calculator.
There is no correct number, but there is correct arithmetic
You will see 1% quoted most often, with 0.5% and 2% on either side. No source can tell you which one is right for you, because the answer depends on how a losing streak affects your decision-making and on how long you intend to keep trading. Anyone who gives you a single number without asking about either is selling something.
What can be done exactly is the arithmetic. Once you pick a percentage, the consequences follow with no uncertainty at all. The tables below are that arithmetic, so you can choose the number with your eyes open rather than picking a round figure because it appeared in a forum post.
The percentage does one job: it converts your account balance into a cash risk budget. That budget then combines with your stop distance to produce a position size, which is what the position size calculator computes.
What a losing streak costs
Losing runs are normal at any win rate. The question the percentage answers is how much equity is left when one is over. Each line is simple compounding: remaining equity after n consecutive losses is (1 - risk%)^n.
| Consecutive losses | Risking 0.5% | Risking 1% | Risking 2% |
|---|---|---|---|
| 5 | 97.52% | 95.10% | 90.39% |
| 10 | 95.11% | 90.44% | 81.71% |
| 20 | 90.46% | 81.79% | 66.76% |
Twenty losses in a row at 2% leaves you with about two thirds of the account. At 0.5% the same run leaves you with about nine tenths. Neither is catastrophic in isolation, but the difference is what determines whether you are still trading with a clear head afterwards, and whether the next trade is sized by the method or by the urge to make it back.
Why drawdowns are harder to climb out of than to fall into
Losses and gains are not symmetrical. To return to break-even after a drawdown, you need a gain of 1/(1 - loss) - 1, which grows faster than the loss itself.
| Drawdown | Gain needed to recover |
|---|---|
| 10% | 11.1% |
| 20% | 25.0% |
| 30% | 42.9% |
| 50% | 100.0% |
| 70% | 233.3% |
A 20% drawdown needs a 25% gain, which is merely hard. A 50% drawdown needs you to double what is left. That asymmetry is the strongest arithmetic argument for keeping the per-trade percentage small: the cost of a deep drawdown is not proportional to its depth.
Percentage risk versus fixed lot size
A fixed lot size and a fixed percentage start out identical and then diverge the moment the balance moves. With a fixed 0.50 lots, your risk as a share of the account grows as the account shrinks, because the same position is now being carried by less equity. With a fixed percentage, the size falls automatically with the balance: a 1% risk on 10,000 is 100, and on 8,000 it is 80. That is not a clever trick, it is just the budget being recalculated from the current balance every time.
The same applies in reverse. After a winning run, a fixed percentage quietly increases your size, which is usually what people want without having to decide it.
Two constraints that override the percentage
The unit step
On a small account, a small percentage may not be placeable. Risk 0.25% on a 500 USD account and the budget is 1.25 USD. With a 20-pip effective stop on EUR/USD, that budget supports 1.25 / 0.0021 = 595 units, which is below the 1,000-unit step most brokers use. Rounded down, the correct size is zero. The honest response is a wider stop, a larger percentage, or no trade; rounding up to one micro lot would put your actual risk far above 0.25%.
Correlated open positions
The percentage applies to a single trade. If five positions are open at once and they all express the same view, the worst case is not 1%, it is closer to the sum. Five correlated positions at 1% each behave like one position at roughly 5%. Either cap total open risk across the book, or treat the group as a single trade and size it once.
How to choose your number
- Pick the losing streak you can sit through. Look at the first table and choose the column you could watch happen without changing your method. Not the one that looks best on paper.
- Check it against your smallest tradable size. Work out whether the percentage survives rounding on your account balance and your typical stop distance.
- Decide what happens across open positions. Per trade, or per book. Write it down before the trades are open.
- Hold it constant. A percentage that changes with conviction is not risk management. If a setup deserves more size, take it at the standard risk and let the outcome compound.
A percentage you choose is one way to arrive at the number. The other is to derive it from your own record: the kelly criterion calculator that sizes from a win rate and a payoff ratio returns full Kelly, half Kelly and quarter Kelly as a share of the balance, and prints the break-even win rate next to them so the edge the number assumes is visible.
Either way the inputs — a real win rate, a real average loser — come from a record of trades, not from a feeling. If you do not have a record yet, that is what a simulator is for: Forex Tester is a backtesting tool that replays historical forex data, so a sizing plan can be run through dozens of trades before any of them is live.
Whatever you settle on, the number only becomes real when it is converted into units with the spread and commission inside the budget. That conversion is the whole job of a position size calculator.
Day trading: the same percentage, spent several times a day
A percentage risk is quoted per trade, and a swing trader spends it once or twice a week. A day trader spends it several times before lunch, so the number that decides whether the account survives is not the one entered into the calculator — it is how many times that number gets spent in a day.
| Losing trades in a row | Left at 1% per trade | Cost of the run | Left at 2% per trade | Cost of the run |
|---|---|---|---|---|
| 3 | 97.03% | 2.97% | 94.12% | 5.88% |
| 5 | 95.10% | 4.90% | 90.39% | 9.61% |
| 10 | 90.44% | 9.56% | 81.71% | 18.29% |
| 20 | 81.79% | 18.21% | 66.76% | 33.24% |
Read the third column as a day, not a career. Three losing trades at 1% is a 2.97% day; five is 4.90%. That is the arithmetic behind the habit of setting a daily stop-out: decide the number of losses that ends the session before the session starts, because deciding it mid-run is how a 3% day becomes a 10% one. At 2% per trade the same five losses cost 9.61%, which is a quarter of a bad month in one morning.
Two things are different about the tickets themselves. Intraday stops are tighter, so the same 1% budget buys a larger size — a 10-pip stop sizes three times the units of a 30-pip one — and the commission, charged per volume, is charged on that larger size, which is the mechanism behind the costs-eat-the-budget effect. And one pip of spread against a 10-pip stop is a tenth of the distance you are risking, against a thirtieth on the swing trade: the tighter the stop, the more of your budget the broker's spread consumes before the trade has moved.
One constraint has nothing to do with arithmetic. In the US, a margin account flagged as a pattern day trader has to hold 25,000 USD, and falling under it restricts the account to closing positions — which is a reason some small accounts end up on cash accounts or on futures rather than a reason to change the percentage.
Questions traders ask
How much should a day trader risk per trade?The same percentage as anyone else — what changes is how often it is spent. At 1% per trade, three losing trades is a 2.97% day and five is 4.90%; at 2%, the same five cost 9.61%. The useful habit is a daily stop-out fixed in advance: pick the number of losses that ends the session, because the percentage only limits one ticket and a day trader places several.
Should day trades be sized differently from swing trades?Not in the formula, but the inputs differ enough to change the answer. An intraday stop is tighter, so the same 1% budget buys roughly three times the units of a 30-pip swing stop, and the commission is charged on that larger size. A pip of spread is also a tenth of a 10-pip stop against a thirtieth of a 30-pip one, so costs take a bigger share of the budget on the shorter trade.
What percentage should I risk per trade?There is no correct number, but there is correct arithmetic, and it is visible in the tables above. Twenty consecutive losses at 2% leaves about two thirds of the account; the same run at 0.5% leaves about nine tenths. Pick the column you could watch happen without abandoning your method, not the one that looks best on paper.
Is 1% per trade too little?Depends entirely on what you can sit through. The first table shows 1% leaves 81.79% after twenty straight losses and 90.44% after ten. If those numbers make you uncomfortable, the answer is a smaller column — and if they make you feel you are wasting time, note that a fixed percentage quietly grows your size after a winning run without you deciding to.
Why is recovering from a drawdown harder than falling into one?Because gains and losses are not symmetrical: the gain needed to get back to break-even is 1/(1 − loss) − 1. A 20% drawdown needs a 25% gain, which is merely hard; a 50% drawdown needs you to double what is left. The deeper you go, the faster the cost grows, and that asymmetry is the strongest arithmetic argument for keeping the percentage small.
Should I risk a fixed lot size or a fixed percentage?A percentage. The two start identical and diverge the moment balance moves: with a fixed lot size your risk as a share of the account grows as the account shrinks, because the same position is carried by less equity. A percentage recalculates the budget from the current balance — 1% is 100 on 10,000 and 80 on 8,000.
Does the percentage apply per trade or across open positions?Per single trade, which is why correlated positions override it. Five open positions expressing the same view at 1% each behave like one position at roughly 5%. Either cap total open risk across the book, or treat the group as one trade and size it once — decided before they are open, not after.
Related guides
- How to calculate position size in forex
- Position sizing for crypto futures
- Position sizing on a small account — when 1% is smaller than the minimum step.
- Forex compounding calculator — what the percentage you pick here does to the balance two hundred trades out.
- Adding to a position — several entries, one risk budget.
- Forex, stock and crypto position size calculator