Fair Value Gap vs Order Block
Michael Whitman
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Trading since 2017, full-time since 2020
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Published 2026-09-08
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Updated
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Reviewed
A fair value gap is the band from candle one's high up to a higher candle-three low, or the bearish mirror. The order block is a single candle: the last one to close against a move that then broke structure. The gap starts where candle one ends, so the two sit side by side.
These two are often drawn on the same move and described as the same area. The geometry says otherwise. A bullish gap’s band starts at candle one’s high, and an order block is a candle, so when candle one is the block the gap sits right above it. Counting how often candle one actually qualifies is the useful part.
What each one is
Here a fair value gap is measured from candle one’s edge. In the bullish case the band starts at candle one’s high and ends at candle three’s low. The bearish mirror is on the fair value gap page.
An order block is the final candle that closed against a move which then broke structure. For a bullish one, that is the last down candle before an advance that closes past a swing high. Order block covers the definition and its conditions.
Both come from the smart money concepts vocabulary, and both are described as places large orders were left behind. That story is not visible in price data for either.
Where they differ
How they relate on the chart. When candle one is the block candle, the gap starts at the block’s high. Adjacent, never nested: no part of a bullish gap can lie inside candle one’s range.
What each needs. The gap needs three candles. The order block needs an opposing candle, a swing that was marked earlier, and a close beyond it.
How wide each is. The gap is the space between two wicks. The order block’s zone is candle one’s body, with the stop below its wick. On IWM the band was about as wide as that body and narrower than the whole candle.
How often each qualifies. Gaps are frequent. A move that both leaves a gap and turns its candle one into an order block was uncommon.
Which one to use: Fair Value Gap or Order Block?
Choose the gap when two people must end up drawing the same area, because the rule leaves nothing to choose.
Use the order block when a structure break has already printed and the candle before the move really closed against it. Otherwise there is no block, whatever the move looked like.
When both are present, treat them as two areas from one move. The block sits below a bullish gap, so they give a stop a different distance, not a second piece of evidence.
Was candle one an order block?
The test. For every gap on IWM, ask two questions. Did candle one close against the move (down for a bullish gap, up for a bearish one)? And was candle two or candle three a structure break in the gap’s direction, using five-bar swings? An order block in the full sense needs both.
Opposing candle one: 351 of 1,194 bullish gaps (29.40%). Across all 6,627 sessions, 48.56% closed down, so candle one of a bullish gap was less likely than an ordinary session to be a down candle (Fisher exact test, p below 0.001). Bearish gaps match: candle one closed up in 32.30%, against 51.00% of all sessions.
A structure break: 230 bullish gaps (19.26%) and 170 bearish (19.61%). Both conditions together: 67 bullish gaps (5.61%) and 45 bearish (5.19%), 112 in all over 26 years.
One move that had both
Candle one. On 4 May 2026 IWM opened at $278.70 and closed at $277.88, a down candle, with a high of $280.79.
The break. On 5 May it opened at $280.13 and closed at $282.56, above the swing high of $279.79 set on 21 April: a break of structure.
Candle three. On 6 May the low was $283.36, above candle one’s high. The gap ran from $280.79 to $283.36, starting exactly where the order block candle ended. A stop under the gap and a stop under the block’s wick, where the order block page puts it, were $4.69 apart, the whole of candle one’s range.
The original data
The sample. 6,627 IWM daily bars from Yahoo Finance, 26 May 2000 to 2 October 2026 (opens, highs, lows and closes). 2,061 gaps: 1,194 bullish and 867 bearish. Structure uses the five-bar swing rule from break of structure, counting any break in the gap’s direction.
The width check. The band was a median 0.426 times candle one’s range, and wider than candle one in 360 of 2,061 gaps (17.47%). Against candle one’s body, the order block’s zone, it was a median 0.980 times as wide.
The file. Every gap with candle one’s open and close, whether it opposed the move, and whether the move broke structure is in the IWM gap and block file.
What is left out. “Last opposing candle” here means candle one only; a looser search further back would find more blocks. Nothing measures what price did after either area.
When it fails
The failure is calling the gap and the block one zone and counting it twice. The move that leaves a gap is what makes candle one look like a block, so seeing both feels like agreement. On IWM most gaps had no opposing candle one and no break at all; where both appeared, they came from one move. Treating that as two confirmations doubles the confidence on a single observation.
The second failure is calling any candle before a gap a block. Most were not opposing candles.
A third is skipping the structure break. Without it the block definition is gone.
A fourth is placing the stop inside the block when the plan used the gap. The distances differ.
And a fifth is drawing the block after the move. Then the candle is chosen to fit.
Related
Fair value gap has the band rule. Order block has the candle rule and its break condition. And smart money concepts is the framework both names come from.
Mark the gap and the block as two areas next to each other, not one on top of the other. The block is candle one, and the gap starts at its edge. If you want both before acting, expect to wait: on IWM the full combination appeared only a few times a year.
— Michael Whitman
This page is educational, not financial advice. Test every idea on your own charts before risking money.