Zodiac Compatibility Calculator
Check the love compatibility of any two star signs, with strengths and clashes based on fire, earth, air and water.
- Free forever
- Instant results
- Private — runs in your browser
For entertainment only — astrology isn't a science, and nobody's love life should depend on it.
How to use the Zodiac Compatibility calculator
- Tap your star sign and your partner's (or crush's, or best friend's). Not sure? Enter a birthday and we'll pick the sign.
- Tap Check to get your compatibility percentage, what makes you click and what to watch out for.
- Share the card — the link opens straight to your result so friends can compare theirs.
Scores are built from the classic astrology rules: matching elements (fire, earth, air, water) score highest, complementary elements (fire + air, earth + water) come next, and the angle between the signs — trine, sextile, square or opposition — nudges the result up or down. Same signs in any order always give the same answer.
Frequently asked questions
Which zodiac signs are most compatible?
In traditional astrology, signs of the same element (for example Aries, Leo and Sagittarius — all fire) are considered the most harmonious, followed by complementary elements: fire with air, and earth with water. Opposite signs such as Leo and Aquarius are said to have a strong magnetic pull.
Are Leo and Aries compatible?
They are both fire signs, which astrology treats as a high-energy, highly compatible match: lots of passion and adventure, with the occasional clash of two big personalities. Pick Leo and Aries above to see the full breakdown.
How is zodiac compatibility calculated here?
Each pair is scored from three rules: the elements of the two signs, their modalities (cardinal, fixed or mutable) and their aspect, meaning how far apart they sit on the zodiac wheel. A tiny fixed adjustment per pair keeps similar pairs from tying. It is deterministic and purely for fun.
What is my zodiac sign by birthday?
Sun signs follow traditional date ranges (shown under the picker when you choose a sign), from Aries (21 March – 19 April) to Pisces (19 February – 20 March). If you were born on the day a sign changes, the exact cut-off can vary by a day depending on the year, so check both neighbouring signs.
Is zodiac compatibility real?
There is no scientific evidence that star signs predict personality or relationship success. Treat the result as a conversation starter — kindness, communication and shared values matter far more than any horoscope.