Tool 07
Overnight Gap Calculator
Gap size, fill target, gap % vs prior range — classify gap type and bias
🌙
- 1Enter the Prior Day Close — yesterday's RTH settlement price.
- 2Enter Today's Open — first traded price of today's regular session (not overnight).
- 3Enter the Prior Day Range (High − Low) to classify the gap as micro, small, medium, large, or extreme.
- 4Gap Fill Target = prior close. 50% Fill Level = mid-gap, useful as a partial target.
- 5Read the verdict for statistical bias on whether the gap will fill or follow through.
💡 Gap <10% of prior range → high fill probability, fade the open. Gap >50% of range → imbalanced day, trade with the gap direction.
Dollar Value
—
per contract
% of Prior Range
—
prior day range
Gap Fill Target
—
= prior close