Moon Phase Soulmate

Enter two birthdays and see if your moon phases complete a full moon — the viral TikTok moon phase soulmate test. Free, no sign-up.

Enter your birthday to reveal the Moon phase you were born under — its shape, brightness, and personality. Add someone else's birthday and we'll overlap your two moons to see if they complete a full moon: the TikTok 'moon phase soulmate' test.

My birthday

Their birthday (optional)

How Moon compatibility works

The Moon runs a roughly 29.5-day cycle from new to full and back. We find the phase for each birthday, then overlap the two shapes. The closer they add up to a full moon, the higher your score — opposite phases complete each other, matching phases mirror each other.

FAQ

How is the Moon phase calculated?

From your birth date we compute the Moon's age within its 29.5-day cycle, then map it to one of the 8 phases and its illumination percentage. Time of day isn't needed for the phase.

Is this a real compatibility test?

No — it's the viral 'moon phase soulmate' trend, meant purely for fun. Treat it as a playful icebreaker, not relationship advice.

Do I need my birth time?

No. The phase changes slowly over a day, so your date alone is enough for the moon and the compatibility score.

About This Content

Moon Phase Soulmate is the free version of the viral TikTok test that reads two birthdays as two moons. Type in your birth date and instantly see the exact moon phase you were born under — new, crescent, quarter, gibbous, or full — with its illumination percentage and a fun personality read for that phase. It's the fastest moon phase by birthday lookup, no sign-up needed.

Add a partner's, friend's, or crush's birthday and we overlap your two moons. If your phases sit opposite each other and add up to a full moon, you score high — that's the whole idea behind moon phase soulmate: what one of you lacks, the other fills. Matching phases score as twin souls who simply get each other. Every pairing gives you a 0–100 compatibility score, a soulmate band, and a shareable card.

Curious what phase your birthday holds, or whether your moons complete each other? Search moon phase soulmate, moon phase compatibility, or moon phase by birthday and try any two dates you like. Enjoy it next to Waglebagle's other love tools — zodiac compatibility, birthstones, and name compatibility — all 100% free and just for fun.