Calendars & dates / Zodiac
Zodiac Compatibility Calculator
Choose two zodiac signs or birthdays to see their traditional aspect and a transparent score out of 100. Explore the compatibility chart, optionally compare Sun and Moon signs, and save a card with no birth dates.
Zodiac Compatibility Calculator: Shows the shortest distance between two signs and its traditional aspect, with TOEA's fixed score for that aspect. Trine scores 90, sextile 82, conjunction 75, opposition 68, semi-sextile 58, square 48 and quincunx 42. Elements and modalities add context without changing the score. With two birthdays, you can compare Sun–Sun, Moon–Moon and person 1's Sun with person 2's Moon, then see their plain average. The 12 by 12 chart uses the same scale. Compatibility by sign is a cultural and entertainment tradition; it makes no predictions and is not relationship advice. Runs 100% locally in your browser with zero server file uploads.
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- Astrology & fortune
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Two signs. One visible rule. Explore the traditional aspect between them, then see every pairing in the chart.
Leo + Sagittarius
Trine
Sun-sign aspect score on TOEA's scale; not a percentage or a probability.
A trine is the most harmonious aspect in this sign-based ranking. The signs share an element and its themes.
Two fire signs share themes of action, enthusiasm and initiative.
The signs have different modalities: Fixed and Mutable. Fixed signs are traditionally associated with persistence and continuity. Mutable signs are traditionally associated with adapting and changing direction.
Invite links include your sign, plus your first name only if you choose. Birthdays never appear in the link.
Share card
The card shows the two Sun signs and their aspect score. Birth dates and times are never included.
How this score is made
TOEA's scale for the traditional aspect ranking
Count the shortest distance around the twelve signs, from zero to six signs apart. That distance selects an aspect and the fixed score below. Elements and modalities explain the tradition; they do not adjust the score. The traditional readings are cultural interpretations; the numbers are TOEA's published scale, not ancient percentages.
| Aspect | Signs apart | Traditional reading | Score |
|---|---|---|---|
| Trine | 4 | Most harmonious | 90 |
| Sextile | 2 | Harmonious | 82 |
| Conjunction | 0 | Same sign | 75 |
| Opposition | 6 | Attraction of opposites | 68 |
| Semi-sextile | 1 | Neighbouring signs | 58 |
| Square | 3 | Tense | 48 |
| Quincunx | 5 | Awkward | 42 |
Compatibility chart
Each cell uses the same published scale. Person 1's row is highlighted; the outlined cell is your pairing. Scroll sideways to see all twelve signs.
| Person 1 / Person 2 | Aries | Taurus | Gemini | Cancer | Leo | Virgo | Libra | Scorpio | Sagittarius | Capricorn | Aquarius | Pisces |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Aries | 75 | 58 | 82 | 48 | 90 | 42 | 68 | 42 | 90 | 48 | 82 | 58 |
| Taurus | 58 | 75 | 58 | 82 | 48 | 90 | 42 | 68 | 42 | 90 | 48 | 82 |
| Gemini | 82 | 58 | 75 | 58 | 82 | 48 | 90 | 42 | 68 | 42 | 90 | 48 |
| Cancer | 48 | 82 | 58 | 75 | 58 | 82 | 48 | 90 | 42 | 68 | 42 | 90 |
| Leo | 90 | 48 | 82 | 58 | 75 | 58 | 82 | 48 | 90 | 42 | 68 | 42 |
| Virgo | 42 | 90 | 48 | 82 | 58 | 75 | 58 | 82 | 48 | 90 | 42 | 68 |
| Libra | 68 | 42 | 90 | 48 | 82 | 58 | 75 | 58 | 82 | 48 | 90 | 42 |
| Scorpio | 42 | 68 | 42 | 90 | 48 | 82 | 58 | 75 | 58 | 82 | 48 | 90 |
| Sagittarius | 90 | 42 | 68 | 42 | 90 | 48 | 82 | 58 | 75 | 58 | 82 | 48 |
| Capricorn | 48 | 90 | 42 | 68 | 42 | 90 | 48 | 82 | 58 | 75 | 58 | 82 |
| Aquarius | 82 | 48 | 90 | 42 | 68 | 42 | 90 | 48 | 82 | 58 | 75 | 58 |
| Pisces | 58 | 82 | 48 | 90 | 42 | 68 | 42 | 90 | 48 | 82 | 58 | 75 |
Compatibility by zodiac sign is a cultural and entertainment tradition. It makes no predictions and is not advice about relationships. A score does not measure a person's character or the quality of a relationship.
Names and birthdays are never sent for calculation. Invite links carry your sign and, only if you choose, your first name. Opening or sharing that link reveals those details. Names appear on the card only when you choose to include them.
The four elements and three modalities
Western astrological tradition groups Aries, Leo and Sagittarius as fire; Taurus, Virgo and Capricorn as earth; Gemini, Libra and Aquarius as air; and Cancer, Scorpio and Pisces as water. Fire and air are commonly considered complementary, as are earth and water.
The cardinal signs are Aries, Cancer, Libra and Capricorn; the fixed signs are Taurus, Leo, Scorpio and Aquarius; the mutable signs are Gemini, Virgo, Sagittarius and Pisces. Cardinal is associated with initiation, fixed with continuity and mutable with adaptation. These are traditional symbolic groupings, not measured personality traits.
The aspects between signs and TOEA's scale
The tropical zodiac has twelve equal signs. Their shortest separation gives conjunction at zero signs apart, semi-sextile at one, sextile at two, square at three, trine at four, quincunx at five and opposition at six. Tradition commonly reads trines and sextiles as harmonious, squares as tense, quincunxes as awkward and oppositions as a contrast or attraction of opposites.
TOEA's published scale translates this traditional ranking into scores out of 100: trine 90, sextile 82, conjunction 75, opposition 68, semi-sextile 58, square 48 and quincunx 42. These editorial numbers are not inherited ancient percentages or success rates. All interpretations use signs rather than exact planet-to-planet angles, and no other score adjustments are made.
Birthday boundaries and the Moon
Birthday mode uses the usual calendar boundaries shown in Star Sign Dates: Aries starts on 21 March, Taurus 20 April, Gemini 21 May, Cancer 21 June, Leo 23 July, Virgo 23 August, Libra 23 September, Scorpio 23 October, Sagittarius 22 November, Capricorn 22 December, Aquarius 20 January and Pisces 19 February. The actual Sun's entry varies by year and time, so cusp birthdays need a precise astronomical chart for certainty.
The Moon sign uses geocentric tropical ecliptic longitude calculated by Astronomy Engine, an MIT-licensed library. Without a birth time the calculation uses noon; the UTC offset defaults to zero and can be changed to the historical offset at the birthplace. Coordinates do not affect this geocentric calculation. The three deeper comparisons have equal weight, and the combined score is their plain average, displayed to at most two decimal places.
How to use it
- Choose each person's zodiac sign or enter their birthday.
- Compare the signs and read the aspect, element and modality notes.
- Explore the chart or save a share card; include optional names only if you choose.
Privacy & limitations
All calculations happen in your browser. Names, dates, times and results are not uploaded. Share cards never contain birth dates or times, and names are included only when you choose.
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Frequently asked questions
How does the compatibility score work?
The shortest distance around the twelve zodiac signs determines an aspect. TOEA's scale for the traditional aspect ranking assigns a fixed score: trine 90, sextile 82, conjunction 75, opposition 68, semi-sextile 58, square 48 and quincunx 42. The full table is shown above. There are no element bonuses, modality adjustments or random numbers. This score is not a probability or a measured percentage.
Are opposite zodiac signs compatible?
Tradition describes an opposition as the attraction of opposites. Opposite signs have complementary elements and the same modality, suggesting a contrast within a shared rhythm. The scale gives opposition 68. This is a traditional interpretation, not evidence that a relationship will succeed or fail.
Does the Moon sign matter?
In astrology, the Moon is commonly associated with feelings and familiar responses. Deeper mode shows Sun–Sun, Moon–Moon and person 1's Sun with person 2's Moon, with each aspect and score. Its combined score is the plain average of those three rows. Swapping people may change the ordered Sun–Moon row. Unknown birth times use noon, and the Moon may change signs during that day.
Is zodiac compatibility scientific?
No. Astrological compatibility is a cultural and entertainment tradition, not a scientific measure of a relationship. Astronomical Moon positions do not validate the interpretations or the scale. This tool makes no predictions and does not offer relationship advice.
Are my birthday and name private?
Your inputs stay in this browser and are not uploaded. The saved card contains only the two Sun-sign glyphs and names, their aspect and score. Personal names appear only if you choose to include them. Birth dates and times never appear on the card; sharing the card sends only the image to the service you select.
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