Candlesticks + A/D Line: Reading Accumulation

Volume weighted by where the close sat

By: 42Fibonacci
Updated: 6 Nov 2026
Read time: 8–10 min

The Accumulation/Distribution (A/D) line is Chaikin's running total of volume, weighted by where each close sat in its day's range: near the high adds, near the low subtracts. Unlike OBV, it counts a day that closes below the day before but near its own high as buying. Read its direction and agreement with price, never its level; it ignores gaps.

At a glance

Type: Context framework
What it adds: Whether volume has been landing on closes near the high or near the low
Built from: Where each close sits in its range, times volume
Read it for: Direction, swings and agreement with price, never the level
Common misconception: A rising A/D line ≠ price is about to rise

What Is the Accumulation/Distribution Line

The Accumulation/Distribution line (A/D line, or ADL) is a volume indicator developed by Marc Chaikin, who first called it the Cumulative Money Flow Line. It answers one question:

Has the volume been landing on closes near the high, or near the low?

Accumulation means buying that builds a position over time. Distribution means selling that unwinds one. A/D tries to show which has been happening by looking at two things every day: where the close finished inside the day’s range, and how many shares traded. A close near the high on heavy volume pushes the line up. A close near the low on heavy volume pulls it down.

It is a running total, so it shows the sum of all those days, not any one of them. If you are new to volume itself, start with Candlesticks + Volume; this page assumes you know what a volume bar shows.

Note

Two indicators share the name. Larry Williams published a different one, usually called Williams Accumulation/Distribution. It uses the previous close twice: to decide whether the day counts as up or down, and to measure the day’s move from a true low or true high that reaches back to the previous close across any gap. So unlike Chaikin’s line, it does see gaps. Most platforms compute it without volume, though some add it. Charting platforms label the two inconsistently, so check which one you have loaded. This page is about Chaikin’s.

How the A/D Line Is Built

The line comes from three steps, each built on the one before:

Step	How it’s calculated	What it tells you
Money flow multiplier	((Close − Low) − (High − Close)) ÷ (High − Low)	Where the close sat in the day’s range, from −1 to +1
Money flow volume	Multiplier × the day’s volume	How much of the day’s volume counts as buying or selling
A/D line	Yesterday’s A/D + today’s money flow volume	The running total of every day so far

The multiplier is the heart of it. Some platforms call it the Close Location Value (CLV). A close exactly at the high scores +1, so all of the day’s volume is added. A close exactly at the low scores −1, so all of it is subtracted. A close in the middle of the range scores 0 and adds nothing, however heavy the volume.

Take a Hammer. The day before closed at $50.40. Today the stock opens at $50.30, sells off to $48.40, and buyers push it back to close at $50.20, just under the day’s high of $50.40. One million shares trade.

The close is $1.80 above the low and $0.20 below the high, in a $2.00 range. The multiplier is (1.80 − 0.20) ÷ 2.00 = +0.80, so 800,000 shares are added to the A/D line. The stock closed lower than the day before, yet A/D counts the day as mostly buying. That is what the long lower wick says too: sellers had control early, and buyers had it by the close.

Note

Two relatives you may see. Chaikin also built two indicators from the same money flow volume. Chaikin Money Flow adds it up over a fixed window (20 days is the common default) and divides by that window’s total volume, so it swings around zero instead of running on forever. The Chaikin Oscillator is the difference between a 3-day and a 10-day exponential moving average of the A/D line, a momentum read of A/D itself. Neither is covered further here.

A/D vs OBV: Where the Close Sat, Not Which Way It Moved

On-Balance Volume (OBV) is the other common running total of volume. It asks a simpler question: did the stock close higher or lower than the day before? On an up close it adds the whole day’s volume; on a down close it subtracts the whole day’s volume.

For the Hammer above, the two disagree. OBV sees a close 20 cents lower and subtracts all one million shares. A/D sees a close near the high and adds 800,000. Same day, same volume, opposite answers.

That difference is why A/D matters for bullish reversal candles. A Hammer often closes below the day before, yet near its own high. At the end of a decline, a run of days like that can lift A/D while OBV is still falling:

A/D and OBV on the same barsIllustrative

In the shaded seven sessions, every close is a little lower than the day before, but each one sits near the top of its range, above a long lower wick. OBV only asks whether the close was up or down, so it subtracts all of each day’s volume and keeps falling until the price low. The A/D line asks where the close sat in the day’s range, so it counts more than half of that volume as buying. Its low comes the day before the shaded run, and it rises through all seven days while price is still falling.

Neither line is right and the other wrong. OBV tells you price is still slipping from close to close. A/D tells you that inside each day, buyers have been winning the last part of the session. When they disagree like this, that disagreement is the information.

Days like these are the exception, though. On most days a stock that closes up also closes in the upper part of its range, and the two lines move together. That is why 42Fibonacci does not compute A/D: the two carry nearly the same information, so any volume-flow reading on the site is built on OBV alone.

Read the Direction, Not the Number

The A/D line has no meaningful level. Its value depends on the first day of data your platform loaded, so the same stock can show a positive reading on one chart and a negative one on another. It is counted in shares, so it can’t be compared between stocks either. A reading of 4 million says nothing on its own.

What you read is its shape: whether it is rising or falling, whether its swings are making higher lows or lower lows, and whether it is moving the same way as price.

Three Ways to Read A/D

Agreement: A/D moves with price
When price makes higher highs and higher lows and A/D does too, volume has been landing on strong closes and the uptrend has buying behind it. A falling A/D under a falling price backs the decline the same way. Agreement adds weight to the trend you already see; it does not predict the next move.
Bullish divergence: price makes a lower low, A/D does not
Divergence means price and A/D disagree. Price falls to a new low, but A/D holds above its last low or turns up. Sellers moved price lower, yet closes have been finishing nearer the highs. It is a warning that the decline is losing its selling, not a buy signal: it can last for weeks before price turns, and some never do.
Accumulation into support: A/D flat or rising while price falls to a level
Price drifts down into a level that held before, such as the bottom of a trading range or a rising moving average, while A/D goes sideways or creeps up. Buyers appear to be absorbing the selling at that level. It describes what is happening, not what will happen; the level still has to hold.

Tip

Read divergence on clear swings, not on a wiggle. Compare one obvious price low with the next, and the A/D readings at those same two days.

Using A/D with Bullish Reversal Candles

A candlestick pattern tells you where and when buyers pushed back. A/D tells you whether volume has been leaning their way for longer than one day. Use them together in three steps:

Start with the candle and its level
A bullish reversal candle after a decline, at a level that matters. Without that, A/D has nothing to back.
Look at A/D over the weeks before the candle
Is it still falling with price, flat, or already making a higher low while price made a lower one? Flat or rising into the candle means buying was showing up before the pattern printed.
Watch the confirmation day
A later close above the pattern's high, often the next session, confirms it. If that close sits near the day's high on solid volume, it lifts A/D again. A confirmation close in the bottom half of its range drags A/D down even if price closed higher.

Warning

The candle moves A/D by itself. A Hammer closes near its high, and because of how the formula works, that alone adds to A/D. An uptick in A/D on the Hammer’s own day is the candle’s shape counted a second time, not separate evidence. What adds something is A/D turning before the candle, or rising again on the days after it.

For example, a Hammer forms at a prior swing low after a three-week decline. Over the last week, price kept closing a little lower, but A/D has been rising, because each of those days closed near its high. The candle and the volume read agree, and A/D gives you a reason to watch for the confirmation close.

Now take a Bullish Engulfing where A/D has fallen steeply for a month and the engulfing day gives only a small uptick. Most of the volume has been landing on weak closes. The candle may still work, but the volume read does not back it yet.

Multi-day patterns such as the Morning Star are read the same way: check where each candle closed in its own range, because each one moves A/D on its own day.

What A/D Can't Do

It doesn’t see gaps. The multiplier uses only the day’s own high, low and close. It never looks at the previous close, so a gap is invisible to it. Say a stock closes at $50.00, then gaps down to open at $46.00, trades between $45.50 and $47.00, and closes at $46.90 on 2 million shares. Price lost $3.10, over 6%. But the close sat near the top of the day’s range, so the multiplier is about +0.87 and A/D adds roughly 1.7 million shares as buying. OBV, which compares closes, subtracts all 2 million. After a gap, check what price actually did before you trust the A/D reading.

It ignores how far price moved. A/D is built from where each close sat in its range, not from the size of the move, so it can drift away from price for long stretches, and its signals sometimes simply fail. Price comes first; A/D is context for it.

It can’t call the turn. A rising A/D says closes have been finishing near the highs. It does not say when price will follow, or that it will. A candlestick pattern and its confirmation do the timing.

It can’t say who was buying. The name suggests large investors quietly building positions, but the line only sees where the close landed. A close near the high on heavy volume looks the same whoever made it.

Worked example

A stock has fallen for four weeks into a level that held twice last year. All that time the A/D line has moved sideways. Today a Hammer prints at the level, and A/D jumps. Someone says: 'A/D just turned up. Volume confirms the Hammer. Buy now.'

What's wrong with this reasoning?

The approach

Today's jump is the Hammer itself. A Hammer closes near its high, so by how the formula works it adds most of the day's volume to A/D; that uptick is the candle's shape counted a second time, not separate evidence. What adds something is A/D turning before the candle or rising after the confirmation. Here, A/D holding flat while price fell for four weeks is the real read: buying may have been absorbing the selling at the level. Check that none of those sessions gapped down, since a gap-down day that closes near its high still lifts A/D. Then wait for a close above the Hammer's high, often the next session, ideally near that day's high so A/D rises again.

Common A/D Mistakes

Mistake	Instead
Reading the level A/D is at minus 20 million. That stock is under heavy distribution.	The level depends on where the data starts and can't be compared between stocks. Read the direction and the swings, and compare them with price.
Trusting A/D across a gap The stock fell 6% on a gap down, but A/D went up. Smart money was buying.	A/D never sees the gap. A day that opened far lower and closed near its high still reads as buying. Judge the gap from price; that day's A/D step only says where the close sat after the gap.
Treating divergence as a reversal call Bullish divergence on A/D. The bottom is in.	Divergence says closes have been finishing stronger than price suggests. Declines can carry on through it. Wait for a bullish reversal candle at a level and its confirmation.

Key takeaways

A/D adds each day's volume weighted by where the close sat in the day's range: +1 at the high, −1 at the low, 0 in the middle
Unlike OBV, it credits where the close landed, so a day that closes below the day before but near its own high, like many Hammers, counts mostly as buying
The level means nothing; read the direction, the swings and whether A/D agrees with price
Bullish divergence (price lower low, A/D higher low) warns that selling is fading; it is not a trigger
A reversal candle lifts A/D on its own day, so the useful read is A/D turning before the candle or after it
A/D ignores gaps: a gap down that closes near its high still reads as buying
Use A/D as context behind a candlestick pattern, never on its own

Frequently Asked Questions

What is the Accumulation/Distribution line?

The Accumulation/Distribution (A/D) line is a volume indicator developed by Marc Chaikin. Each day it adds or subtracts part of the day's volume depending on where the close sat in the day's range: a close near the high adds most of it, a close near the low subtracts most of it. The running total shows whether volume has been landing on strong closes or weak ones.

How is the A/D line calculated?

In three steps. The money flow multiplier is ((close − low) − (high − close)) ÷ (high − low), which runs from −1 at the low to +1 at the high. Multiply it by the day's volume to get money flow volume. Add that to yesterday's A/D value to get today's.

What is the difference between A/D and OBV?

OBV adds the whole day's volume when the close is higher than the day before and subtracts it when the close is lower. A/D ignores the previous close and weights volume by where the close sat in the day's own range. A day that closes below the day before but near its own high, like many Hammers, lowers OBV but raises A/D.

Is a rising A/D line bullish?

It says volume has been landing on closes near the highs, which is buying pressure, but it does not say price will rise or when. Read it with price: A/D rising along with price backs the uptrend, and A/D making a higher low while price makes a lower low is a bullish divergence.

What does A/D divergence mean?

Divergence is when price and the A/D line disagree. Bullish divergence: price makes a lower low while A/D makes a higher low, so closes have been finishing stronger than the price trend suggests. Bearish divergence is the mirror at a high. Divergence can last for weeks, and the trend can continue through it, so let a candlestick pattern and its confirmation do the timing.

Does the value of the A/D line matter?

No. Its value depends on the first day of data your platform loaded, so the same stock can read positive on one chart and negative on another, and it is counted in shares, so it cannot be compared between stocks. Read its direction, its swings and whether it agrees with price.

Why can the A/D line rise when a stock gaps down?

The multiplier only uses the day's own high, low and close and never looks at the previous close, so gaps are invisible to it. A stock that opens on a gap down, loses 6% on the day and closes near the top of that day's range adds to A/D as if it were a buying day. After a gap, judge the move from price first.

How do I use A/D with a Hammer or other bullish reversal candle?

Check A/D over the weeks before the candle. Flat or rising A/D while price made its last lower lows means buying was already showing up. Don't count the candle's own uptick: a Hammer closes near its high, so it lifts A/D because of how the formula works. Then wait for confirmation: a later close above the pattern's high, often the next session, ideally near that day's own high.

Is the A/D line the same as Chaikin Money Flow?

No, but they share a step. Both are built from money flow volume. The A/D line is a running total that never resets. Chaikin Money Flow adds money flow volume over a fixed window, commonly 20 days, and divides by that window’s total volume, so it moves around zero. The Chaikin Oscillator is a third relative: the difference between a 3-day and a 10-day exponential moving average of the A/D line.

Is Williams Accumulation/Distribution the same indicator?

No. Larry Williams' Accumulation/Distribution uses the previous close twice: to decide whether the day counts as up or down, and to measure the day's move from a true low or true high that reaches back to the previous close across any gap. So unlike Chaikin's line, it does see gaps. Most platforms compute it without volume, though some add it. Because the names are close and platforms label them inconsistently, check which one you have loaded.

The Bottom Line

The A/D line doesn’t make a candlestick pattern work. It tells you whether volume has been landing on strong closes or weak ones, which a close-to-close measure like OBV can’t show.

So when you check A/D behind a bullish reversal candle, ask one question: “Was buying showing up in the closes before this candle?” A/D rising while price made its last lower lows says yes. A/D still falling steeply into the candle says not yet. And after a gap, look at price first.

This is one of seventeen context guides in this series: Candlesticks + Moving Averages for trend structure, Candlesticks + RSI for how stretched a move is, Candlesticks + MACD for momentum, Candlesticks + ADX for trend strength, Candlesticks + Volume for conviction, Candlesticks + On-Balance Volume for volume flow, Candlesticks + Volume Spread Analysis for reading each bar’s effort and result, Candlesticks + Volume Profile for the prices where volume traded, Candlesticks + Anchored VWAP for the average price paid since a turn, Candlesticks + Fibonacci for retracement levels, Candlesticks + ATR for volatility, Candlesticks + Bollinger Bands for volatility bands around an average, Candlesticks + Multi-Timeframe Analysis for the weekly trend, Candlesticks + 52-Week High/Low for where price sits in its yearly range, Candlesticks + Trend Channels for where in the trend price sits, and Candlesticks + Trading Ranges for sideways markets. New to candles? Start with the candlestick basics guide.

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