Fun & Culture Calculators
Calendars, sky lore, numbers and oracles from around the world, calculated carefully and explained honestly. Every tool runs in your browser and shows its working.
For entertainment and self-reflection: This section covers traditions people have used for centuries to think about time, character and choices. Nothing on this page is a prediction, and it is not financial, medical, psychological or legal advice. Use it as a prompt for thought, not as a basis for decisions.
How we approach this section
8calc is mostly about money, health and everyday numbers. This section is different in subject but not in method. Where a tradition depends on something real, such as the position of the Moon, the date of the Chinese New Year or the Maya calendar count, we calculate it properly and check our results against authoritative sources such as NASA and JPL data. Where a tradition is symbolic, such as numerology, tarot or the I Ching, we explain exactly how the method works, where it comes from and what the evidence does and does not say. All meanings are written in our own words.
Not sure where to start? The moon phase calculator will show you the Moon on the night you were born, the Chinese zodiac calculator handles the tricky January and February birthdays correctly, and the Mayan and Aztec day sign calculator converts any date into the sacred 260-day count still kept by Maya daykeepers in Guatemala. If you enjoy numbers, the life path calculator shows every step of the arithmetic, including master numbers, so you can check it by hand.
Nothing here is a prediction or advice. These are tools for curiosity, conversation and reflection.
Sky and calendar
Calculators built on real astronomy: the Moon, the Sun and the planets, computed in your browser.
Moon Phase Calculator
Find the Moon phase for today, your birthday or any date from 1900 to 2100: phase name, percent lit, Moon age and the next full and new moons.
Zodiac Sign and Compatibility Calculator
Find your sun sign from your birth date, with exact cusp dates for your birth year, then compare two signs by element, mode and aspect.
Big Three and Birth Chart Calculator
Find your sun, moon and rising sign (the big three) plus Mercury to Saturn from your birth date, time and city, computed with a real ephemeris.
Venus and Mars Sign Calculator
Find your Venus sign and Mars sign from your birth date, with exact degrees, retrograde status and the dates each planet was in that sign.
Saturn Return Calculator
Find the exact dates of your first, second and third Saturn return from your birth date, including retrograde passes, using a NASA-checked ephemeris.
Mercury Retrograde Dates and Checker
Every Mercury retrograde from 2025 to 2028 with station times from NASA JPL data, plus a checker that tells you whether Mercury is retrograde on any date.
Calendars of the world
How other cultures count time, from the Chinese lunar new year to the Maya Long Count.
Chinese Zodiac Calculator
Find your Chinese zodiac animal and element from your exact birth date, using real Lunar New Year dates, then check compatibility with a partner.
Mayan and Aztec Day Sign Calculator
Find your Maya Tzolk'in day sign, Haab date and Long Count, plus the matching Aztec tonalpohualli sign, for any birth date, using the GMT correlation.
Birthstone and Birth Flower Finder
Find your birthstone and birth flower from your birth date or month: modern and traditional stones, Mohs hardness, flower meanings and gift tips.
Numbers and names
Numerology and number games, with every step of the arithmetic shown.
Life Path Number Calculator
Calculate your numerology life path number step by step, with master numbers 11, 22 and 33, karmic debt checks and your birthday number.
Personal Year Number Calculator
Find your numerology personal year, month and day numbers for any date, with the working shown and the theme of each year in the nine-year cycle.
Name Numerology Calculator
Turn a name into numerology numbers: expression (destiny), soul urge and personality, with the letter-by-letter working shown and a Chaldean comparison.
Angel Number Meanings Calculator
Look up any angel number, from 111 and 1111 to your own sequence: its digits, its numerology root and its traditional meaning, plus why we notice them.
Biorhythm Calculator
Chart the classic 23-, 28- and 33-day biorhythm cycles from your birth date, see today’s values and critical days, and learn what the research found.
Cards, coins and runes
Classic oracles and their real history, drawn with your browser’s random number generator.
Daily Tarot Card and Yes or No Tarot
Draw a daily tarot card or ask a yes-or-no question from a full 78-card deck, with plain-English upright and reversed meanings and a transparent yes/no rule.
Birth Card Calculator: Playing Card and Tarot
Find your playing-card birth card and planetary ruling card, plus your tarot birth cards and tarot year card, with every step of the arithmetic shown.
I Ching Hexagram Calculator (Three-Coin Method)
Cast an I Ching hexagram with the traditional three-coin method, or enter your own tosses. See the hexagram, changing lines and the hexagram it moves to.
Rune Casting: Elder Futhark Rune Draw
Draw one rune or a three-rune spread from the 24-rune Elder Futhark, with each rune’s sound, original meaning and modern reading, plus its real history.
Just for fun
Games that make no claims at all.
Privacy
Birth dates, names and questions you type into these tools are processed in your browser. They are not stored on our servers or sent anywhere.
Sources and corrections
Every page in this section ends with a list of the books, papers and data sets it relies on, from NASA’s JPL Horizons ephemeris and the Hong Kong Observatory’s lunar calendar tables to classic texts such as James Legge’s 1882 translation of the I Ching. Where traditions disagree, for example on how to treat a tarot total of 22 or which day starts the Chinese year, the page says which convention it follows and why. If you spot a mistake, please tell us through the contact page and we will check it and fix it.
Frequently asked questions
Are these calculators accurate?
The astronomy-based tools (moon phase, zodiac, birth chart, planets and Mercury retrograde) are checked against NASA and JPL data, and the calendar tools against published reference dates. The symbolic tools follow their traditional rules exactly and show their working.
Can any of these predict the future?
No. They are offered for entertainment and self-reflection. Please base real decisions on facts and, where needed, professional advice.
Is my information stored?
No. Every calculation runs in your browser and nothing you type is saved or sent anywhere.
Why does another site give a different answer?
Many traditions have competing methods, such as different ways of reducing numbers or different start dates for the Chinese year. Each page explains the method it uses so you can compare.
Who writes these pages?
They are written and reviewed for 8calc by Stanley King. See the About page for more about the site.
By Stanley King · About 8calc · Last reviewed October 2026