Zodiac Friendship Compatibility Calculator measures friendship harmony using zodiac aspects, planetary dignity, and 11th house synastry. Results show emotional connection, communication flow, trust strength, activity match, and future bonding potential in a structured, data-driven format.

Your Name Your Zodiac Sign

Friend’s Name Friend’s Zodiac Sign

–%

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— & —

01 Friendship Core

Friendship Index —

–%

Raw—

Aspect—

Total weighted platonic score.

Astro Geometry ANGLE

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Aspect—

Type—

Geometric relationship.

Planetary Dignity LORDS

—

P1—

P2—

Ruler friendship status.

02 Friend A Profile

Social Archetype VIBE

—

Mode—

Trait—

Approach to social groups.

Ruling Energy GUIDE

—

Planet—

Focus—

Cosmic influence.

Friendship Role TYPE

—

Style—

Need—

Your archetype in a duo.

03 Friend B Profile

Social Archetype VIBE

—

Mode—

Trait—

Approach to social groups.

Ruling Energy GUIDE

—

Planet—

Focus—

Cosmic influence.

Friendship Role TYPE

—

Style—

Need—

Their archetype in a duo.

04 Friendship Mechanics

Comm. Sync TALK

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Mercury—

Depth—

Verbal connection quality.

Trust Factor BOND

–%

Stability—

Saturn—

Emotional reliability.

Social Battery DO

—

Level—

Pref—

Energy expenditure match.

05 Guidance

Ideal Activity FUN

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Vibe—

Focus—

Best bonding scenario.

Conflict Risk WARN

—

Trigger—

Risk—

Potential friction point.

Long-Term Bond FUTURE

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Growth—

11th House—

Friendship longevity.

The Zodiac Friendship Compatibility Calculator is a web-based application designed to quantify the astrological compatibility between two individuals using a predefined algorithm based on zodiac sign properties. It accepts two specific inputs—the zodiac signs of two individuals—and processes them through a multi-step logic engine. The tool converts these categorical inputs into a numerical “Friendship Index” (percentage), a text-based “Verdict,” and a series of secondary metrics that break down the interaction into specific mechanical components, such as communication speed, emotional trust, and social energy.

The core function of the Zodiac Friendship Compatibility Calculator is to map astrological relationships (aspects, planetary rulers, and elements) into weighted scores. It generates a visual report including a radar chart and a detailed data grid, providing a mathematical representation of the theoretical interaction between the selected signs.

Inputs Used by the Zodiac Friendship Compatibility Calculator

The calculator operates using four input fields, two of which are used for display purposes and two of which act as the primary variables for the calculation logic.

Person 1 Name & Person 2 Name:
- Type: Text String.
- Function: These inputs are strictly labeled identifiers. They are passed directly to the results display (e.g., the “Hero Names” section) and the exportable CSV file. They do not influence the mathematical scoring or the algorithmic logic.
Person 1 Zodiac Sign & Person 2 Zodiac Sign:
- Type: Dropdown Selection (Fixed Set).
- Values: The Zodiac Friendship Compatibility Calculator offers 12 specific options, ranging from Aries to Pisces.
- Associated Data: Each selection maps to a hardcoded data object containing fixed properties used in the formula:
  - Element (el): Fire, Earth, Air, Water.
  - Quality (q): Cardinal, Fixed, Mutable.
  - Ruler (rul): Planetary ruler (e.g., Mars, Venus).
  - Polarity (pol): Masculine (Mas) or Feminine (Fem).
  - Index (idx): An integer from 0 (Aries) to 11 (Pisces) used for geometric calculations.

How the Zodiac Friendship Compatibility Calculator Works

The calculation process executes in a linear sequence immediately upon user trigger. The internal algorithm follows this specific order:

1. Geometric Aspect Calculation

The Zodiac Friendship Compatibility Calculator first determines the geometric distance between the two selected signs using their Index (idx) values.

Step A: It calculates the absolute difference between the two indices.
Step B: It normalizes this difference to find the shortest distance on a 12-step circle (Result is between 0 and 6).
Step C: This distance is mapped to a specific astrological “Aspect” and a base angleScore:
- 0 (Conjunction): Score 100 (Unity).
- 1 (Semi-Sextile): Score 40 (Friction).
- 2 (Sextile): Score 90 (Flow).
- 3 (Square): Score 50 (Tension).
- 4 (Trine): Score 95 (Harmony).
- 5 (Quincunx): Score 45 (Adjustment).
- 6 (Opposition): Score 80 (Balance).

2. Planetary Ruler Dignity Analysis

The tool then evaluates the relationship between the ruling planets of the two signs using a fixed PLANET_FRIENDS lookup table.

Same Ruler: If both signs share a ruler (e.g., Taurus and Libra both ruled by Venus), the planetScore is set to 95.
Compatible Rulers: If the ruler of one sign appears in the friend list of the other (e.g., Mars is listed as a friend of the Sun), the planetScore is set to 85.
Neutral/Incompatible: If neither condition is met, the planetScore defaults to 60.

3. 11th House Synastry Check

The Zodiac Friendship Compatibility Calculator checks for “11th House” placement, which is technically associated with friendship. The formula calculates the index of the 11th sign from Person 1 ((idx + 10) % 12). If Person 2’s index matches this value (or vice versa), a flat 15-point bonus (houseBonus) is added to the calculation.

4. Final Weighted Scoring

The final “Friendship Index” is derived using a weighted sum formula:

$$Score = (AngleScore \times 0.6) + (PlanetScore \times 0.4) + HouseBonus$$

The result is rounded to the nearest integer and capped at a maximum of 100.

5. Verdict Assignment

The total score is compared against fixed thresholds to assign a text label:

90–100: Soul Bond
80–89: Best Friends
70–79: Solid Crew
60–69: Casual Pals
< 60 (or Hard Aspect): Frenemies (if specific geometric tension exists) or Complex.

Results and Metrics Explained

The Zodiac Friendship Compatibility Calculator outputs several specific metrics derived from the secondary properties of the input signs.

Core Metrics

Friendship Index: The primary weighted percentage indicating overall algorithmic compatibility.
Astro Geometry (Angle): The specific geometric relationship (e.g., Trine, Square) derived from the distance between signs.
Planetary Dignity: A status label (“Aligned” or “Distinct”) based on whether the planetScore exceeds 80.

Mechanical Metrics

Communication Sync: A score derived from Element and Quality compatibility.
- Inputs: Air element adds +2; Mutable quality adds +2; Harmonious aspects (0, 2, 4) add +3.
- Output: Maps to labels “Telepathic” (Score ≥ 6), “Chatty” (Score ≥ 4), or “Quiet” (Score ≤ 2).
Trust Factor: A base percentage reflecting stability.
- Calculation: Starts at 80%. Adds +10% if either sign is Fixed quality. Adds +10% if either sign is Earth element. Deducts 20% if the geometric distance creates a “Hard Aspect” (1, 3, or 5).
Social Battery: Compares the Polarity of the two signs. If both are Masculine or both are Feminine, the output is “Synced.” If they differ, the output is “Mixed.”

Radar Chart Dimensions

The Zodiac Friendship Compatibility Calculator plots five axes on a radar chart, each calculated independently:

Emotional: Weighted by Water elements and Trine/Conjunction aspects.
Intellectual: Weighted by Air elements and Sextile/Opposition aspects.
Fun: Weighted by Fire elements and Jupiter influence.
Trust: Weighted by Earth elements, Fixed qualities, and Saturn influence.
Spiritual: Weighted by 11th House placements and Neptune influence.

Interpreting the Calculation Output

The numerical output of the Zodiac Friendship Compatibility Calculator represents a summation of predefined astrological rules.

Higher Values (85–100%): Indicate that the inputs triggered high-value multipliers in the formula, such as Trine aspects (0.6 weight) or shared Planetary Rulers (0.4 weight).
Mid-Range Values (60–84%): Indicate a mix of high and low scoring factors. For example, an Opposition aspect provides a high geometric score (80), but if the planetary rulers are not linked in the lookup table, the planetary score defaults to 60, pulling the average down.
Lower Values (< 60%): Indicate that the inputs resulted in “Hard Aspects” (Square, Semi-Sextile, Quincunx) which return lower base angle scores (40–50), and lack specific planetary harmony or house bonuses to offset the deficit.

Assumptions and Calculation Limits

The Zodiac Friendship Compatibility Calculator operates under specific constraints enforced by the code:

Sun Sign Exclusivity: The tool calculates compatibility solely based on the Sun sign (Index 0–11). It does not account for Moon, Rising, or Venus signs, which are often used in full synastry charts.
Fixed Aspect Orbs: The calculator assumes exact whole-sign aspects. It does not calculate degrees within a sign. For example, any Aries and any Cancer are treated as exactly 90 degrees apart (Square), regardless of their specific birth dates.
Binary Polarity: The system uses a binary “Masculine/Feminine” polarity for Social Battery logic, which is a simplification of the active/receptive energy principle.
Score Capping: The logic explicitly caps the final score at 100. Even if a user has a Conjunction (100), Shared Ruler (95), and 11th House Bonus (+15), the displayed result will not exceed 100%.

Estimation Disclaimer

This tool provides a simulation of astrological compatibility based on a specific, finite set of algorithmic rules and fixed data points. The resulting percentages and labels are theoretical estimates generated by the code and do not guarantee the quality, longevity, or nature of any real-world human relationship.

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