Intraday Intensity Index: Where the Close Sits and What Volume Says

A stock jumps early, trades near its high for an hour, then slides all afternoon and finishes just a rupee above the low. The day’s candle may still be green if it opened lower. But anyone who watched the session knows sellers won that day. The intraday intensity index is one of the oldest attempts to put a number on exactly that feeling: where did the close land inside the day’s range, and how much volume stood behind it?

It’s a small formula. It also sits quietly inside two better-known indicators, the Accumulation/Distribution Line and Chaikin Money Flow. Understand this one piece and both of those suddenly make a lot more sense.

What the intraday intensity index measures

Investopedia credits the indicator to Dave Bostian and describes it as a volume-based measure that combines a security’s latest close, high and low with its volume. The idea is simple. A close near the top of the day’s range suggests buyers were in control into the finish. A close near the bottom suggests sellers were. Volume decides how much that day should count.

Notice what it ignores: the previous day’s close. The indicator doesn’t care whether the stock gapped up or down overnight. It only looks inside today’s bar. That one design choice is the source of both its usefulness and its biggest weakness, and we’ll come back to it.

The formula, step by step

Break it into two parts. First, a ratio that tells you where the close sits in the range:

Close location ratio = (2 × Close − High − Low) ÷ (High − Low)

Then weight it by volume:

Intraday intensity = Close location ratio × Volume

If the numerator looks unfamiliar, rewrite it. (2 × Close − High − Low) is the same thing as (Close − Low) − (High − Close). That’s the exact form StockCharts’ ChartSchool uses for its Money Flow Multiplier, which it then multiplies by the period’s volume to get Money Flow Volume. Same arithmetic, different name.

A quick word on notation. You’ll sometimes see this formula typeset with volume in the denominator. Go with the multiplied version. When ChartSchool builds Chaikin Money Flow from these values, it sums the volume-weighted figures and then divides by total volume, and that only gives a bounded ratio if volume was multiplied in the first place.

How the ratio behaves

According to ChartSchool, the multiplier swings between +1 and −1. It is +1 when the close equals the high, −1 when the close equals the low, positive when the close is in the upper half of the range and negative in the lower half. A close bang in the middle gives zero, so that day’s volume effectively doesn’t count at all.

That last point matters more than it seems. On a day when the stock closes at the midpoint, a huge volume number contributes nothing. The indicator only “spends” volume when the close leans clearly one way.

The intraday intensity index doesn’t ask whether the stock went up. It asks who was winning when the bell rang, and how many shares voted.

A worked example with hypothetical numbers

Let’s take a made-up stock over five sessions. These figures are purely illustrative and don’t belong to any real company.

Walk through Day 1. The range is 520 − 500 = 20. The numerator is (2 × 516) − 520 − 500 = 1,032 − 1,020 = 12. So the ratio is 12 ÷ 20 = 0.60, and multiplying by 8,00,000 shares gives +4,80,000.

Day 3 is the interesting one. The stock made the highest high of the week at ₹530 but closed at ₹517, near the bottom of a ₹15 range. Numerator: 1,034 − 1,045 = −11. Ratio: −11 ÷ 15 ≈ −0.73. And it happened on the heaviest volume of the five days, 14 lakh shares, so the day contributes about −10.27 lakh.

Now add it all up. The five intraday intensity values sum to roughly −1,22,087. Total volume over the five days is 49,00,000. Divide one by the other and you get about −0.025.

Here’s what that tells us. The stock closed the week at ₹526, ten rupees above Day 1’s close of ₹516. A pure price chart says “up week”. But the two heaviest sessions both closed weak, and the strong closes came on lighter volume. The volume-weighted reading is slightly negative. That doesn’t mean sell. It means the rally had less conviction behind it than the closing price suggests, and that is exactly the kind of quiet disagreement this indicator exists to surface.

From one day to a usable signal

A single day’s intraday intensity is noisy. Very few traders look at it raw. There are two common ways to turn it into something you can read on a chart.

Running total: the Accumulation/Distribution Line

Keep adding each day’s value to a running total and you get the Accumulation/Distribution Line. ChartSchool notes that Marc Chaikin built it this way and originally called it the Cumulative Money Flow Line. The direction of the line is what matters, not its absolute level, since the starting point is arbitrary.

Rolling ratio: Chaikin Money Flow

Instead of an endless running total, sum the values over a fixed window and divide by total volume over the same window. That’s Chaikin Money Flow, and our five-day calculation above was a miniature version of it. ChartSchool says the look-back is typically 20 or 21 days, that the result moves between −1 and +1, and that in practice it usually stays between −0.50 and +0.50. Investopedia’s own write-up shows the 21-period version built directly from the intraday intensity values.

The normalised form is far more practical for comparing stocks. A large-cap with crores of shares changing hands and a small-cap trading a few lakh shares can’t be compared on raw intraday intensity. Divide by volume and both land on the same −1 to +1 scale.

How traders read the intraday intensity index

The readings themselves are easy. Positive means closes have been leaning toward the highs with volume behind them, which ChartSchool describes as buying pressure. Negative means the opposite. A cross from negative to positive in the normalised version suggests the balance is shifting.

Where it earns its place is in comparison with price.

• Confirmation. Price making higher highs while the cumulative line also rises tells you the move has volume at the close behind it. ChartSchool treats this as the straightforward use: an uptrend in the indicator reinforces an uptrend in price.
• Divergence. Price at a new high while the line fails to follow is the classic warning. ChartSchool calls this a bearish divergence and says it can foreshadow a reversal. The reverse, price at new lows with the line turning up, is the bullish version.
• Context around levels. Investopedia notes that traders often use it alongside Bollinger Bands or other envelopes, and around support and resistance. A test of resistance on strong closes and heavy volume reads very differently from a test where every attempt fades into the close.

A practical habit: when a stock you hold breaks out, look at the close location on the breakout day itself. A breakout candle that closes in the bottom third of its range, on big volume, has already shown you that sellers were waiting up there. You can see that on the price chart with practice, but the indicator makes it impossible to ignore.

A breakout that closes near its low on heavy volume isn’t a clean breakout. It’s a fight that the bulls didn’t finish.

The gap problem

Because the indicator only looks inside today’s bar, overnight gaps vanish from its view. ChartSchool gives a real example of this with the Accumulation/Distribution Line: a stock gapped down sharply and closed lower, but because it closed near the top of the day’s range, the line went up.

Let’s put numbers on it with another hypothetical. Our stock closes at ₹500. Bad news overnight, and it opens around ₹470. It trades between ₹465 and ₹482 and finishes at ₹480 on 20 lakh shares. That’s a 4% loss on the day. But the close location ratio is (960 − 947) ÷ 17 ≈ +0.76, and the day contributes about +15.29 lakh of positive intensity.

An indicator like On-Balance Volume would do the opposite here. ChartSchool explains that OBV adds a day’s full volume when the close is up and subtracts it when the close is down, so it would knock off all 20 lakh shares.

Which one is right? Both, in a sense. The intraday intensity index is telling you buyers stepped in after the gap and pushed the stock off its lows. OBV is telling you the stock still lost money for anyone who held overnight. Gaps tend to show up around results and big overnight news. So on those days and big news days, treat intraday intensity readings with extra care, and check what the stock did relative to the previous close before reading anything into a “positive” day.

Where it fits with other volume tools

If you’ve read our piece on the Balance of Power indicator, you’ll notice a family resemblance. Both care about where the close sits relative to the session. The difference is that intraday intensity weights the result by volume, so a quiet day barely moves it and a heavy day moves it a lot.

The Money Flow Index is built differently, and our guide walks through its arithmetic. Pairing a close-location tool with one that compares each session against the previous one gives you two separate views of the same volume.

For a broader map of how these tools fit together, our guide to technical analysis for Indian stocks is a good starting point.

Limits to keep in mind

ChartSchool is blunt about this family of indicators: they sit at least two steps away from price, they ignore period-to-period changes, and sometimes they simply don’t work. That’s worth taking at face value.

A few specific traps for Indian traders:

• Thin stocks. In illiquid small-caps, a few large orders near the close can swing the close location sharply. The volume weighting then exaggerates what may just be one participant.
• Circuit-limit days. If a stock opens and stays locked at its upper or lower circuit, the high and low can be identical. The range is zero, the formula divides by zero, and most software will either skip the day or record zero. Know how your charting platform handles it.
• Doji-like days. When the range is tiny, a one-tick difference in the close swings the ratio a lot. A small range on low volume is mostly noise.

None of this makes the indicator useless. It just means the intraday intensity index works best as a second opinion on a price setup you already like, not as a trigger on its own.

A simple way to start using it

Pick three or four stocks you follow closely. Add a 20-day Chaikin Money Flow below the price chart, since that’s the normalised version of the intraday intensity index. For a month, just watch. Note the days where price and the indicator disagree, and see what happened over the next week or two.

You’ll quickly find that most disagreements resolve in favour of price. A few won’t. Those few, where heavy volume kept closing at the wrong end of the range while the price chart looked fine, are the ones that make the indicator worth keeping on your screen.

Disclaimer: This article is for educational purposes only and is not investment advice. The stock prices and volumes used in the examples are hypothetical. Please do your own research or consult a SEBI-registered investment adviser before making investment decisions.