What is the Accelerator Oscillator formula?

AC is AO minus the five-bar SMA of AO. Standard AO is the five-bar SMA of median price minus its 34-bar SMA. Median price is (high + low) / 2. The AO smoothing window includes the current bar.

How is AC different from the Awesome Oscillator?

AO compares two price averages. AC compares AO with its own recent average. AC can be negative while AO is positive, as bar 7 of the worked example shows. AC is also different from the single-bar change in AO.

Can an Accelerator Oscillator bar be green below zero?

Yes. Green describes a rise in AC, while a negative reading places AO below its average. In the example, AC rises from −1.2 to −0.6 and remains negative. Assigning colors from the sign alone gives the wrong result.

Does AC predict the next price reversal?

No guaranteed reversal follows from AC. It measures a difference between filtered historical and current values. Changes can occur without a profitable price move, and the indicator alone does not define a complete trading strategy.

Why do my AC colors differ from another TradingView script?

Check calculation inputs first, then the color rule and confirmation timing. Some scripts assign equal values to red or carry a previous color; this example uses gray. A developing bar can also change color before its close.

TradingView indicator guide

Accelerator Oscillator on TradingView: formula and limits

The Accelerator Oscillator (AC) subtracts the five-bar simple moving average of the Awesome Oscillator (AO) from AO itself. With the standard inputs, AO is the 5-bar SMA of median price minus its 34-bar SMA. AC therefore measures AO relative to its recent average. A green AC column means AC rose from the previous bar; it can still be below zero. A positive AC reading can also be falling. Check value, change and bar confirmation separately when reproducing the indicator in TradingView.

Draft an AC indicator

Calculate the AO baseline, then its deviation

Bill Williams Accelerator Oscillator adds a second calculation to AO. Use median price P = (high + low) / 2, calculate AO = SMA(P, 5) − SMA(P, 34), then AC = AO − SMA(AO, 5). The last average includes the current AO observation. These are price-unit differences, with no fixed upper or lower bound.

Calling AC acceleration is a description of this filtered momentum calculation. It is not a literal second difference of price or proof that a price reversal will follow.
The formula uses historical and current inputs. A developing bar can change its high, low and resulting AC before the close.

Measurement	Comparison	What zero means
AO	Fast price average minus slow price average	The two price averages match.
AC	AO minus its own recent average	AO equals its recent average.
AC change	Current AC minus preceding AC	AC is unchanged, even if nonzero.

Recalculate a hypothetical sequence bar by bar

Assume these AO values have already been calculated: 1, 2, 3, 4, 5, 5, 4, 3, 3.5, 4. This fixture isolates the AC stage; it is not market data or a reconstruction of the earlier 34 price bars. Each row lists the five AO observations used in that row's average.

Bar 6: AO stays at 5, but its average rises to 3.8. AC remains positive at 1.2 and turns red because 1.2 is below 2.0. No increase in AO occurred.
Bar 7: AC crosses below zero even though AO remains positive at 4. The two zero lines answer different questions.
Bar 9: AC = 3.5 − 4.1 = −0.6. It is green because −0.6 is higher than −1.2, even though AO remains below its average.
Bar 10: AC crosses above zero after the first green column. A color change and a zero crossing need not occur on the same bar.

Bar	Five AO values	AO average	AC	Change / color
5	1, 2, 3, 4, 5	3.0	2.0	No prior AC / gray
6	2, 3, 4, 5, 5	3.8	1.2	−0.8 / red
7	3, 4, 5, 5, 4	4.2	−0.2	−1.4 / red
8	4, 5, 5, 4, 3	4.2	−1.2	−1.0 / red
9	5, 5, 4, 3, 3.5	4.1	−0.6	+0.6 / green
10	5, 4, 3, 3.5, 4	3.9	0.1	+0.7 / green

Read the sign and color as separate observations

The TradingView community implementation linked below compares each AC value with its predecessor. It assigns red to ties; this page uses gray instead so an unchanged observation is visible. That is a declared display choice, not a different AC formula. Check the source of any script you compare.

A smaller negative magnitude is a rising value: −0.6 is higher than −1.2. Coloring by absolute magnitude would reverse the intended comparison below zero.
MetaQuotes describes AC color sequences and does not treat a zero crossing alone as a trade signal. Neither a color pair nor a zero crossing specifies exits, position size or execution costs.

AC position	AC movement	Interpretation
Above zero	Rising / green	AO is above its average and the gap is increasing.
Above zero	Falling / red	AO is above its average but the gap is narrowing.
Below zero	Rising / green	AO is below its average but the gap is narrowing.
Below zero	Falling / red	AO is below its average and the gap is widening.

Inspect the calculation in Pine Script v6

Paste this indicator into TradingView Pine Editor and add it to a standard candle chart. It uses chart-timeframe median prices, exposes AO, its average and AC change in the Data Window, and contains no trading orders. Keep completed-bars mode enabled for comparisons with historical bars. Disable it only to inspect the developing value.

At default lengths, 34 continuous valid price bars produce the first AO. Five AO observations produce the first AC on bar 38; bar 39 supplies its first change comparison. Do not replace unavailable history with zero.
At each completed timestamp, subtract the Data Window AO SMA from AO and compare the result with AC. Then subtract the preceding AC to verify the color.
With completed-bars mode enabled, the current realtime column is absent until the closing update. Calculations still run on every update; only the displayed values are gated.
An AO smoothing length of 1 makes AC identically zero wherever AO exists. This is a useful boundary check, not a useful momentum setting.

Calculation example with explicit tie and confirmation policies. Syntax validation does not establish trading performance or parity with every community script.pine

//@version=6
indicator("AC calculation audit", overlay = false, precision = 4)
fastLength = input.int(5, "Fast SMA bars", minval = 1)
slowLength = input.int(34, "Slow SMA bars", minval = 2)
signalLength = input.int(5, "AO smoothing bars", minval = 1)
confirmedOnly = input.bool(true, "Show completed bars only")
if fastLength >= slowLength
    runtime.error("Fast SMA length must be less than slow SMA length.")
ao = ta.sma(hl2, fastLength) - ta.sma(hl2, slowLength)
aoAverage = ta.sma(ao, signalLength)
ac = ao - aoAverage
acChange = ac - ac[1]
canShow = not confirmedOnly or barstate.isconfirmed
acColor = na(acChange) ? color.gray : acChange > 0 ? color.green : acChange < 0 ? color.red : color.gray
plot(canShow ? ac : na, "AC", color = acColor, style = plot.style_columns)
hline(0, "Zero", color = color.gray)
plot(canShow ? ao : na, "AO", display = display.data_window)
plot(canShow ? aoAverage : na, "AO SMA", display = display.data_window)
plot(canShow ? acChange : na, "AC change", display = display.data_window)

Diagnose differences before treating them as signals

A matching name is insufficient to establish matching calculations. Record the chart symbol, feed, session, timeframe, candle type, source and all three lengths. Compare completed timestamps and intermediate values before comparing column colors.

Raw AC amplitudes cannot be compared directly across differently priced instruments. A reading of 2 uses the chart's price units, not a universal strength scale.
AC can alternate around zero in uneven price sequences. Earlier changes in a filtered series do not guarantee earlier profitable entries.

Failure case	Why it matters	Check
Using close instead of median price	Changes both AO averages and every later AC value.	Compare hl2 before checking smoothing.
Using AO − AO[1]	Measures one-bar change, not deviation from a five-bar average.	Bar 6 has AO change 0 but AC 1.2.
Coloring AC > 0 green	Confuses level with change.	Bar 6 must be red; bar 9 must be green.
Comparing an open bar with a closed bar	The open bar's high and low may still change.	Match timestamps and confirmation policy.
Treating repeated flips as independent evidence	The same rolling observations contribute to adjacent AC values.	Examine the price context and evaluate explicit rules separately.

Give Pineify an auditable AC specification

Use the Pine Script AI Coding Agent to draft or explain changes to this calculation. Specify median price, the 5/34/5 lengths, chart timeframe, completed-bar confirmation and the gray tie policy. Ask it to retain the AO, AO average and AC change diagnostic outputs so each result can be checked.

Include the supplied AO fixture and expected AC values: 2.0, 1.2, −0.2, −1.2, −0.6, 0.1. Ask for an explanation of why bar 6 is red and bar 9 is green.
If adding alerts, specify whether the event is a first rising column, a sequence of rising columns or a zero crossing, and when it becomes confirmed.
Review generated source and validate syntax, then compare values on TradingView. Define strategy entry, exits, sizing and costs only after the indicator calculation matches.

Where Pineify fits

Pine Script AI Coding Agent

Draft or explain an Accelerator Oscillator with explicit inputs, confirmation timing and diagnostic values for bar-by-bar review.

Draft an AC indicator

Related resources

TradingView indicator guides Awesome Oscillator calculation and signals Accelerator Oscillator screener Bar-close alert frequency

Frequently asked questions

Educational information, not investment advice. The numerical sequence is hypothetical and is not a backtest. Indicator colors, zero crossings and syntax validation do not guarantee trading returns.

Sources and verification

Last verified: 2026-10-17

Published by Pineify. Pineify is an independent product and is not affiliated with TradingView. Sources support the technical explanations; examples do not establish trading performance.