Value Area High (VAH)

What VAH means

A value area is the range of prices around the POC that contains a chosen share of a session activity. Convention puts that share at about 70 percent, loosely modeled on the idea that roughly 68 percent of a normal distribution sits within one standard deviation of the mean. The upper boundary of that range is the value area high, abbreviated VAH.

In plain terms, VAH is the highest price at which the market did a large share of its business. Trading above it means the market is operating outside the zone it accepted as fair, at least for the period measured.

How VAH is calculated

The standard method starts at the POC. The software adds the next two price rows above and the next two below, compares which pair has more activity, and adds the larger pair. It repeats this until the accumulated activity reaches the target share, often 70 percent. The highest price included is the VAH and the lowest is the VAL.

Different platforms vary slightly: some use volume, some use time, some use different row sizes. As a result, VAH values can differ by a tick or two between charting packages. That is normal, and it is why consistency in the tool you use matters more than the exact print.

How traders use VAH

The prior day VAH is a common reference level. A market that opens above it is described as opening out of value to the upside. A market that opens inside the value area is described as opening within value. These are descriptions of location, and what the market does next is the real information.

A well-known heuristic, often called the 80 percent rule, says that if the market opens outside the prior value area, re-enters it and accepts there for a sustained period, it frequently travels to the opposite edge. It is a rule of thumb, not a statistical law, and traders disagree about how often it works.

Others watch VAH as a place to judge acceptance and rejection. If price pushes above VAH and holds there, that suggests acceptance of higher prices. If it pokes above and falls back inside, that suggests rejection. The distinction is explored in the Academy page on acceptance versus rejection.

Reading the open relative to VAH

There are three simple starting positions. If the market opens above the prior VAH, it is out of value to the upside, and the first question is whether it holds there. If it opens between the POC and VAH, it is inside the upper half of value and the question is whether it pushes through the edge. If it opens below the POC, VAH is far overhead and may only matter later in the session.

In each case the more useful observation is not the starting position but the behavior near VAH: whether the market spends time above it, how much volume appears at the edge, and whether pullbacks hold above it. Those clues separate acceptance from a probe that fails.

How VAH differs from the prior high

The prior day high is the single most extreme print. VAH is the boundary of the zone containing most of the trading. The two can be far apart on days with a long upper tail, and close together on days that end near their highs. For levels, the high shows how far the market reached, while VAH shows where it actually did business. Many traders track both, treating the high as the extreme and VAH as the working boundary of value.

Worked example

Common mistakes

• Treating VAH as resistance. It is a statistical boundary, not a barrier.
• Comparing VAH values from two platforms that calculate the value area differently.
• Applying the 80 percent rule mechanically without considering context, such as news or a gap.
• Forgetting that VAH changes every session, so a stale level from last week is not the same reference.

How it connects to ES, NQ, SPY and QQQ

ES, NQ, SPY and QQQ each have their own value areas. Most traders build the value area on futures because they have the deepest, longest-trading data, then translate it to ETF terms by dividing by about 10 for SPY and about 41 for QQQ.

LiquidityLevels briefings often cite the prior-session VAH in futures terms with its approximate SPY or QQQ equivalent so an options trader can see the level in the instrument they actually trade.

Frequently asked questions