Home · For two · Biorhythm Compatibility

biorhythms · changes every day

Biorhythm Compatibility: What Is Today Like for You Two?

The classic biorhythm model follows three cycles from the day of birth: physical (23 days), emotional (28) and intellectual (33). Two people are never static — their waves drift in and out of phase. Enter two birth dates and see today's sync plus the best shared day ahead.

free · no sign-up · calculated in your browser

Two birth dates — nothing else needed

You
Partner
Calculation settings — time, place, orbs, zodiac

Dimensions in the total score

Time and city unlock the eighth dimension — Ascendant × Sun. Search fills coordinates and timezone automatically; you can still adjust UTC manually.

Two dates are enough. A city adds the Ascendant; only the city search query goes to Open-Meteo, while birth dates and results stay in your browser.

Why this page is worth bookmarking

Everything birth-based about a couple is fixed — but the biorhythm overlay moves every day. Some mornings your emotional cycles peak together (long talks land softly); on others one of you is at the bottom of a wave while the other surfs. The meter above shows today's sync as a percentage and a small 14-day chart with the best shared day marked — a reason to check back tomorrow, and a kind way to plan the week.

An honest note

Biorhythms are a popular twentieth-century theory, not settled science — we show the mathematics openly and treat the result as a playful planning lens. Used kindly, it does one genuinely useful thing: it reminds you that a partner's off day is a wave, not a decision about you.

Continue exploring

for twoHarmony meterall seven dimensions at oncefor twoFor couplestests, questions and ritualstodayToday in the almanacmoon, card and one warm question

Frequently asked questions

How is biorhythm sync between two people calculated?

Each person's three sine cycles run from their birth date. Sync is how close the two waves are today: 100% means perfectly in phase, 50% means unrelated. The overall number weighs the emotional cycle most.

Why does our compatibility change every day here?

Because the cycles move. Six of the meter's seven dimensions are fixed at birth; the biorhythm bar and the “today” box are recalculated daily — that is what makes this page reusable.

Is biorhythm compatibility scientific?

No — it is a beloved pop model, and we say so. The arithmetic is transparent, the framing is playful, and the practical value is real: better-timed kindness.