Portfolio Heat: How to Manage Total Open Risk in 2026
Portfolio heat is the total amount your account loses if every open position hits its stop at the same time. It is one number, it is easy to calculate, and most traders who blow accounts have never once written it down.
The reason it goes unmeasured is that it does not feel like a risk decision. Each entry was sized properly. Each stop was placed where it belonged. Nothing about the fourth trade looked different from the first. The problem is that risk per trade is measured one position at a time, while a daily loss limit is measured across all of them.
In this guide we will define portfolio heat precisely, show how to calculate it in under a minute, explain why correlation quietly multiplies it, and set out how to build a ceiling that keeps a bad session from becoming a rule breach in a simulated funded account.
Key Takeaways
- Add up your open risk, not your open positions. Heat is the sum of entry-to-stop distance across everything you are currently holding.
- Set the ceiling below the account rule. Total heat should sit comfortably inside the daily loss limit so a full stop-out is survivable.
- Count correlated positions as one. Four trades that lose on the same headline are one trade with four tickets.
- Check heat before every new entry. The question is never whether the next trade is good, it is whether you can afford it on top of what you already hold.
- Recalculate when you move a stop. Trailing a stop to breakeven reduces heat and frees capacity, which is the cleanest way to add.
What this guide covers
- What portfolio heat is, and how to calculate it
- Why correlation multiplies your heat
- Setting a heat ceiling that respects the account rules
- Managing heat during a live session
- Where traders get this wrong
What portfolio heat is, and how to calculate it
Portfolio heat is the combined dollar risk of every open position, measured as the distance from each entry to its stop, multiplied by size. If every stop filled at once, that total is what you would lose. Calculating it takes about thirty seconds and it is the single most useful number on a trading screen that nobody displays.
The calculation
For each open position, take the difference between your entry price and your stop price, multiply by position size, and note the dollar figure. Add those figures together. That sum is your portfolio heat. Express it as a percentage of your account or, more usefully in a funded account, as a percentage of your daily loss limit.
Take an illustrative example. Four positions each risking half a unit of risk gives total heat of two units. If your risk unit is one percent of the account, you are carrying two percent of open risk. That is not reckless in itself. It becomes reckless the moment it sits close to the level that ends your day, and it becomes dangerous when those four positions are really one idea.
Why risk per trade is not enough on its own
Risk per trade answers a single question: how much does this one idea cost if it fails? Portfolio heat answers the question that actually ends accounts: how much does today cost if everything fails together? A trader following a disciplined one percent rule can still take a five percent day simply by holding five positions.
Our breakdown of how much to risk per trade covers the first number. This article is about the second one, and the two are only useful together. Neither replaces the other.
Heat is not the same as exposure
Traders sometimes substitute notional exposure for portfolio heat, and the two behave very differently. Exposure asks how much market you control. Heat asks how much you have agreed to lose. A large position with a tight stop can carry less heat than a small position with a wide one, which means exposure can rise while heat falls, and the reverse is equally possible.
That distinction matters most in leveraged markets, where notional value is large by design and would produce an alarming number that tells you nothing actionable. What you can act on is the stop distance, because that is the loss you have actually authorized. Heat measures the decision you made rather than the size of the instrument.
Why correlation multiplies your heat
Correlation is what turns a sensible stack of positions into a single concentrated bet. When positions respond to the same driver, their stops do not get hit independently. They get hit in the same fifteen minutes, by the same headline, and your carefully distributed risk arrives as one loss.
The three levels of clustering
At the first level, positions are genuinely unrelated and losses arrive separately, which is what diversification is supposed to buy you. At the second, positions sit in the same sector or respond to the same rate expectation, so losses arrive together more often than not. At the third, several positions are simply different expressions of one macro view, and the diversification is cosmetic.
Most traders operate at the second and third levels while believing they are at the first. That belief is the expensive part. Our guide to correlation risk explained goes deeper into how to identify the linkage before it shows up in your account.
Leverage sharpens all of it
In leveraged markets, heat accumulates faster than it appears to, because a modest move in the underlying produces a large move in the account. The CFTC's customer education material on futures is blunt about this: participants fund contracts at a fraction of the underlying value, and that leverage amplifies the underlying risk in both directions. Margin requirements themselves are published and change with conditions, as CME Group's Micro E-mini S&P 500 margin page shows.
Portfolio Heat
Every position is sized correctly. The account still breaches. That gap is portfolio heat.
Heat is the sum of what all open positions lose if every stop is hit. Correlation is what turns a sensible stack into a single trade wearing four costumes.
Four correct positions, stacked
Open risk
Each entry risks half of one unit. Individually conservative. Together they commit 2R of open risk before a single stop has been touched, and the daily limit does not care that they were placed one at a time.
Correlation is the multiplier
Three steps to control it
STEP 01
Measure before you add
Add up the distance from entry to stop on every open position, in dollars. That total is your heat right now.
STEP 02
Set a ceiling below the rule
Cap total heat at a level comfortably inside the daily loss limit, so a full stop-out is a bad day rather than a breach.
STEP 03
Count correlated positions as one
If two positions would lose on the same headline, treat their combined risk as a single line against the ceiling.
tradefundrr.com
Illustrative example. R values and the stacked layout are a teaching device, not a recommended allocation or a forecast. Simulated trading environment.
Setting a heat ceiling that respects the account rules
Set your maximum portfolio heat at a level where a complete stop-out is a bad session rather than a breach. In a funded account that means anchoring the ceiling to the daily loss limit, not to your account equity, because the limit is what actually ends the day.
Anchor to the rule, not the balance
Suppose a program's daily loss limit is a defined dollar figure. If your total heat equals that figure, then one correlated flush ends the session, and you had no margin for a bad fill or a gap. Setting the ceiling meaningfully below the limit leaves room for slippage, for a stop that fills worse than planned, and for the ordinary noise of execution.
How much below is a judgment call, and it should be a written one. What matters is that the number exists before the session, not that it is optimized. Our guide to risk per trade vs risk per day covers how the two constraints interact.
Different markets, different accumulation
Heat builds differently depending on what you trade. In futures it accumulates in contract increments that are easy to underestimate on micro products. In equities it accumulates through share size and gap risk. In options each leg of a structure may count separately against a position cap. In crypto it accumulates around the clock, because nothing closes to force a reset.
| Measure | What it asks | Scope | When you check it |
|---|---|---|---|
| Risk per trade | What does this idea cost if it fails? | One position | Before entry |
| Portfolio heat | What does everything open cost if it all fails? | All open positions | Before every new entry |
| Risk per day | How much am I willing to lose today in total? | Realized plus open | At session start |
| Daily loss limit | What ends the session under the rules? | Account total | Set by the program |
| Maximum drawdown | What ends the account under the rules? | Account total over time | Set by the program |
Five different constraints. Only the last two are set by the program. The first three are yours to define and are the ones traders skip.
Managing heat during a live session
The working rule is simple: before any new entry, check whether your current heat plus the proposed risk stays under your ceiling. If it does not, the trade does not happen, regardless of how good the setup looks. This is the entire discipline, and it is why writing the ceiling down beforehand matters so much.
Moving stops changes your capacity
Heat is not static. When you trail a stop to breakeven, that position's contribution to total heat drops toward zero, which frees capacity for the next idea. This is the honest way to add exposure during a good session: you are not adding risk, you are recycling risk that a position no longer needs.
The dishonest version is adding a fifth position while the first four are still fully at risk, on the reasoning that the day is going well. It is going well precisely because nothing has been tested yet.
Scaling out is a heat decision too
Taking partial profit reduces heat in the same way that trailing a stop does, because the remaining position risks less in dollar terms even though the stop has not moved. That makes scaling out a legitimate way to create capacity when a stop cannot be sensibly tightened yet, which is often the case early in a move.
The reverse is also true and less obvious. Adding to a winner increases heat, sometimes substantially, because the added size usually sits further from the original stop. A position that was contributing half a unit of risk can quietly become the largest single line in your stack. Recalculating after an add is the only way to see it.
Overnight and multi-day positions
Heat carried overnight behaves differently from heat carried intraday, because a stop cannot protect you across a gap. If your program permits overnight positions, the honest way to account for them is to assume the stop may not fill where it sits, and to treat that position's contribution to heat as larger than the arithmetic suggests.
Some programs require positions to be flat by a set time, which removes the question entirely. Others do not. Either way it is written down, and it is worth reading before you build a routine that depends on holding.
What heat looks like when it goes wrong
The pattern is recognizable. Three positions on, all slightly green, a fourth setup appears and it is the best-looking one of the morning. It gets taken at full size because the rule was about risk per trade and this trade is correctly sized. Twenty minutes later a single piece of news moves the whole complex, all four stops fill within a few minutes of each other, and the day is over on a set of individually reasonable decisions.
- Write your maximum total heat before the session, as a dollar figure.
- Set that ceiling comfortably inside the program's daily loss limit.
- Recalculate heat before every new entry, not after.
- Group correlated positions and count the group as one line.
- Recalculate again whenever you move a stop.
- Treat a full ceiling as a hard stop on new entries, not a suggestion.
- Log your peak heat each day and review it weekly.
Where traders get this wrong
The most common failure is not ignoring portfolio heat, it is measuring it and then overriding it. The number gets calculated, the ceiling is reached, and a compelling setup appears anyway. The ceiling was never the problem. The willingness to treat it as advisory was.
Three specific mistakes
First, counting positions instead of risk. Four positions with tight stops can carry less heat than one with a wide stop, so a position count tells you nothing. Second, ignoring correlation because the tickers look different. Third, measuring heat only at the start of the session, when the number that matters is the one at the moment you consider adding.
The damaging admission
Managing portfolio heat will not make a losing strategy profitable. It has no effect on your edge, your entries or your win rate. What it does is keep a bad day from becoming a rule breach, which in a funded account is often the difference between continuing and starting over.
That is a limited claim, and it is the honest one. Most traders who fail evaluations do not fail because they lacked a good setup. They fail because a normal cluster of losses landed on top of an account that was carrying too much open risk at once. Heat is the number that would have told them, and it takes thirty seconds to check.
All of this is practiced in a simulated environment, where the rules are published in advance and the cost of learning the lesson is a lesson. Nothing here is a prediction of results, and you should always confirm the daily loss limit and drawdown terms in the written rules of your own account before you set your ceiling against them.
Frequently Asked Questions
What is portfolio heat in trading?
Portfolio heat is the total amount your account would lose if every open position hit its stop at the same time. It is calculated by adding the entry-to-stop dollar risk of every position you are currently holding.
How do you calculate portfolio heat?
For each open position, multiply the distance between entry and stop by position size to get a dollar figure, then add those figures together. Express the total as a percentage of your account or of your program's daily loss limit.
What is a reasonable portfolio heat limit?
There is no universal number, and any specific figure you see quoted is someone's preference rather than a standard. What matters is that your ceiling sits comfortably inside your daily loss limit so a full stop-out leaves room for slippage.
How is portfolio heat different from risk per trade?
Risk per trade measures one idea in isolation. Portfolio heat measures every open idea together. A trader following a strict per-trade rule can still carry several times that risk across a stack of positions without breaking the per-trade rule.
Does correlation change my portfolio heat?
Yes, in effect. Correlated positions tend to lose together rather than independently, so their combined risk arrives as one loss. The practical fix is to group correlated positions and count the group as a single line against your ceiling.
How does portfolio heat affect a funded account daily loss limit?
Directly. The daily loss limit applies to the account total regardless of how many positions produced the loss, so total open risk is what determines whether a correlated flush ends your session. Confirm your limit in the written rules of your account.
Should I include unrealized profit when measuring heat?
Measure heat from your current stop levels rather than your entry prices once stops have moved. A position trailed to breakeven contributes close to zero heat, which is why moving stops frees capacity for new positions.
Does managing portfolio heat improve my win rate?
No. It has no effect on your edge, entries or win rate. What it does is prevent an ordinary cluster of losses from becoming a rule breach, which in a funded account is often the difference between continuing and starting over.
Know your heat before you add the next one
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