Expert Review: This calculator logic and SEO analysis were reviewed by David Chen, CFA, ensuring accuracy and comprehensive coverage of the Compatibility Index model.
Welcome to the **big 3 compatibility calculator**. This tool helps you assess the synergy between two people based on the combined numerical scores derived from their Sun, Moon, and Rising (Ascendant) placements. Enter any three values to calculate the fourth (the Compatibility Index) or enter the Index and two scores to solve for the missing score.
Big 3 Compatibility Calculator
Calculated Compatibility Index (F):
Calculation Details
Enter your values and click ‘Calculate’ to see the detailed steps.
Big 3 Compatibility Calculator Formula
Where:
- F = Final Compatibility Index
- Q = Sun Sign Score
- P = Moon Sign Score
- V = Rising Sign Score
Variables Explained
- Sun Sign Score (Q): Represents the core identity and ego compatibility, rated from 0 to 100 based on the signs’ element and modality.
- Moon Sign Score (P): Represents emotional security and inner world alignment, rated from 0 to 100 based on their nurturing styles.
- Rising Sign Score (V): Represents first impressions, physical compatibility, and how they approach the world together, rated from 0 to 100.
- Compatibility Index (F): The final calculated score, indicating overall synergy.
What is Big 3 Compatibility?
The “Big 3” in astrology refers to the Sun sign, Moon sign, and Rising sign (Ascendant). These three placements are considered the most crucial in defining an individual’s personality, emotional landscape, and outward presentation. The Compatibility Index model aggregates numerical scores assigned to the synastry (inter-aspects) between two individuals’ Big 3 placements, providing a quantitative measure of their potential relationship harmony.
This calculator uses a simplified, additive model where $F = Q + P + V$. A higher index indicates stronger core compatibility across identity (Sun), emotion (Moon), and approach (Rising). While compatibility is complex and multifaceted, this index serves as a valuable starting point for understanding foundational relationship dynamics. The maximum index is theoretically 300.
How to Calculate the Compatibility Index (Example)
Let’s find the Final Index (F) when Q=75, P=60, and V=45.
- Identify Variables: Sun Score (Q) = 75, Moon Score (P) = 60, Rising Score (V) = 45. The missing variable is F.
- Apply the Formula: Use the equation $F = Q + P + V$.
- Substitute Values: $F = 75 + 60 + 45$.
- Calculate the Result: $F = 180$.
- Conclusion: The calculated Compatibility Index is 180.
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Frequently Asked Questions (FAQ)
What is the maximum possible score for the Compatibility Index?
Since each input score (Q, P, V) is capped at 100 in this model, the maximum possible Compatibility Index (F) is $100 + 100 + 100 = 300$.
Can I use this calculator to solve for a missing score?
Yes. If you know the final Compatibility Index (F) and any two of the three input scores (Q, P, or V), you can leave the remaining score blank, and the calculator will solve for it using simple algebra (e.g., $Q = F – P – V$).
Are negative scores possible?
For input scores (Q, P, V), negative values should not be entered as they represent compatibility ratings (0-100). However, if you attempt to solve for a missing score (e.g., Q) and the resulting value is negative (meaning $P + V > F$), the calculator will identify this as an invalid/non-physical result.
Is this a professional compatibility assessment?
This calculator provides a quantitative index based on a specific numerical model. It should be used for informational and recreational purposes and not as a substitute for professional relationship or astrological consultation.