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AI-Powered Market Intelligence
Understand the reason behind any stock move.
Calculate after-hours reaction size in seconds.
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After-Hours Move Calculator
Calculate after-hours move from regular close.
Measure post-close reaction by comparing after-hours quote with official regular-session close.
Results
After-hours move
-5.45%
After-hours change is -$6.00 (-5.45%).
- Regular close
- $110.00
- After-hours price
- $104.00
- Absolute move
- -$6.00
Formula
After-Hours Move % = ((After-Hours Price - Close Price) / Close Price) × 100
Example
- Close price: 110
- After-hours price: 104
What does this mean?
- •After-hours moves can reset next-day open expectations.
- •Off-hours spreads are wider and liquidity lower.
- •Treat thin prints carefully for decision-making.
Track post-close reactions clearly
Calculate after-hours reaction size in seconds.
What is a after-hours move?
Measure post-close reaction by comparing after-hours quote with official regular-session close. In practice, this means you can quantify after-hours move using close price, and after-hours price without relying on hidden assumptions or black-box scoring.
Primary input set for this calculator: Close price, After-hours price.
How to calculate after-hours move
- 1.Step 1: Enter close price with the timeframe/context you want to evaluate.
- 2.Step 2: Enter after-hours price with the timeframe/context you want to evaluate.
- 3.Step 3: Apply formula After-Hours Move % = ((After-Hours Price - Close Price) / Close Price) × 100.
- 4.Step 4: Interpret output together with risk, liquidity, and catalyst context.
Why this metric matters
This metric standardizes raw price action so you can compare moves across different tickers, sessions, and catalyst windows.
Pair this calculator with catalyst context from headlines, filings, and options flow to avoid relying on isolated numbers.
When to use this calculator
- ✓Before opening a new position where after-hours move impacts sizing or risk.
- ✓After a catalyst to quantify how much conditions changed versus your baseline.
- ✓When comparing setups across multiple tickers with one consistent formula.
- ✓During weekly review to keep decision-making tied to measurable inputs.
Common scenarios
After-hours moves can reset next-day open expectations
Use this after-hours move workflow to quantify this scenario with deterministic inputs.
Off-hours spreads are wider and liquidity lower
Use this after-hours move workflow to quantify this scenario with deterministic inputs.
Treat thin prints carefully for decision-making
Use this after-hours move workflow to quantify this scenario with deterministic inputs.
Event reaction review
Recalculate after-hours move immediately after earnings, filings, or macro headlines.
Interpretation tips
- •Re-run after-hours move whenever key inputs change materially, not only when price moves.
- •Document assumptions so the same methodology can be repeated across watchlist names.
- •Use this metric as one layer in the decision stack, not as a standalone trade trigger.
Data caveats
- –Outputs are deterministic from your inputs; input quality determines output quality.
- –This page does not auto-adjust for broker fees, taxes, or slippage unless you include them in your assumptions.
- –Validate corporate action details, filing dates, and data freshness before acting on results.
FAQ
How does the after-hours move calculator work?
After-Hours Move Calculator is deterministic and uses only your inputs (close price, after-hours price). Formula: After-Hours Move % = ((After-Hours Price - Close Price) / Close Price) × 100.
What does this output tell me in practice?
Calculate after-hours move from regular close. Pair this with a stop-loss and thesis review, not just return math.
Does the after-hours move calculator use real-time market feeds?
No. This page does not auto-pull live data. You control all inputs and can rerun instantly as market conditions change.
Can I use this result directly for trading decisions?
Use it as a planning layer. Combine with position sizing, liquidity, and catalyst context before any execution.
Related tools
Pre-Market Move Calculator→Earnings Move Calculator→Gap Up / Gap Down Calculator→Stock Percentage Move Calculator→
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