FairValueGaps.comCheat sheet
Glossary

Gap size

Gap size is the distance from the top of a fair value gap to its bottom, in price or in pips.

By Michael H.. Last updated . Corrections log

Definition

Gap size is the distance from the top of a fair value gap to its bottom, in price or in pips.

A bullish gap runs from the high of candle 1 up to the low of candle 3. A bearish gap runs from the high of candle 3 up to the low of candle 1. Size is the top minus the bottom.

Size is only comparable on the same instrument, or after it is turned into pips.

On a real chart

XAUUSD15 minute2 bullish 4 bearish ยท 6 gaps by the rule
3980.004000.004020.0006:0008:0010:0012:0014:0016:00123456
  1. 1Bearish4013.64 to 4014.76formed 08:15 UTCTraded through at 08:15 UTC
  2. 2Bullish4019.16 to 4020.95formed 09:00 UTCTraded through at 13:45 UTC
  3. 3Bearish4008.84 to 4015.99formed 14:30 UTCNot revisited by 18:00 UTC
  4. 4Bearish4001.38 to 4007.13formed 14:45 UTCRe-entered at 14:45 UTC, not traded through
  5. 5Bullish3999.26 to 4001.34formed 16:15 UTCTraded through at 16:30 UTC
  6. 6Bearish3997.16 to 3998.82formed 17:30 UTCTraded through at 17:45 UTC
XAUUSD, 23 October 2026, 06:00 to 18:00 UTC. Real candles: Dukascopy 15-minute candles, read 2026-10-25. Fair value gap by the three-candle wick rule, no minimum size. Each box runs from its gap until a later candle trades through its far edge, or to the end of the chart.

Gold (XAUUSD), 23 October 2026, 15 minute candles, 06:00 to 18:00 UTC. The rule finds 6 gaps in this window. A bearish gap whose third candle opens at 14:15 UTC runs from 4008.84 to 4015.99, a size of 7.15 in price. By the end of the chart price had not traded back into it, so it is open.

The window was chosen because it shows the term clearly. It is one chart, and it says nothing about what the next gap will do.

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