Methodology: how Numyra calculates every result
Each calculator follows a named, documented system. This page states the rules we apply, the sources behind them, and how we fix mistakes.
Principles
- Every result names the system it uses (Pythagorean numerology, tropical zodiac) and links back here.
- Where traditions disagree, we say so and describe both instead of picking one silently.
- Numerology and astrology are cultural practices, not sciences. We document how they work; we don’t claim they predict anything.
- The team are researchers and editors who study these historical systems. We hold no certifications in numerology or astrology and don’t claim any.
Date-based numbers
Life Path, Personal Year and Numerology Compatibility use the Gregorian birth date.
| Rule | What we do |
|---|---|
| Reduction order | Reduce month, day and year separately, add them, then reduce the total. We cross-check against the all-digits method and note when the two disagree. |
| Master numbers | 11, 22 and 33 are kept at every stage (month, day, year and total). No other numbers are treated as master numbers. |
| Validation | Real calendar dates only, from 1900 to the current year. February 29 is accepted only in leap years. |
| Testing | Checked against published worked examples, including every master-number path, leap days, and every month/day combination, before publishing. |
Name-based numbers
Destiny, Soul Urge, Personality and Name Numerology convert letters with the Pythagorean chart by default; Chaldean is available as an option and is always labelled. Accented letters are mapped to their base letter (é → E). Y counts as a vowel only when no other vowel appears in its syllable. See our methodology comparison.
Astrology calculations
We use the tropical zodiac and Placidus houses by default. Planet positions will come from the Swiss Ephemeris, which is based on NASA JPL development ephemerides. Birth times are converted to UTC with the IANA time zone database, including historical daylight saving rules. If you don’t know your birth time, we calculate for noon and hide house placements and the rising sign. (The Birth Chart calculator itself is still being built — this section documents the standard it will be held to.)
Your inputs stay on your device
- Numerology calculators run entirely in your browser. Birth dates and names are never sent to our servers or stored.
- Birth chart positions, once that calculator is live, will be computed from a bundled ephemeris in your browser.
- Share links carry only your result (for example
#lp=7), never your inputs, and they sit after the # so they are never sent to a server. - Ad and analytics scripts, once added, will load only after consent and will never receive calculator inputs.
Corrections policy
“Last reviewed” means a desk re-checked the page. A correction means something was wrong and we changed it. We record corrections separately so you can see exactly what changed. See our full editorial policy for how reader reports are triaged.
Change log
No corrections have been needed yet. When one is made, it will be listed here with the date, the page, and exactly what changed.
Sources
Ancient and primary sources
- Aristotle. Metaphysics, Book I, 985b–986a. Perseus Digital Library. On the Pythagorean view that numbers are the principles of things.
- Nicomachus of Gerasa. Introduction to Arithmetic, trans. M. L. D’Ooge. Macmillan, 1926. Internet Archive.
- Iamblichus. On the Pythagorean Way of Life, trans. J. Dillon and J. Hershbell. Scholars Press, 1991.
- Ptolemy, Claudius. Tetrabiblos, trans. F. E. Robbins. Loeb Classical Library, Harvard University Press, 1940. LacusCurtius.
- Manilius, Marcus. Astronomica. Composed 1st century CE — the earliest surviving source linking the four classical elements to the zodiac signs, a century before Ptolemy.
- Sefer Yetzirah (Book of Formation). Sefaria — foundational text of Hebrew Gematria, dated by scholars to the 3rd–6th centuries CE.
Modern numerology texts
- Balliett, L. Dow. The Philosophy of Numbers: Their Tone and Colors. 1908. Internet Archive.
- Cheiro (William John Warner). Cheiro’s Book of Numbers. 1926. Internet Archive.
Scholarship
- Burkert, Walter. Lore and Science in Ancient Pythagoreanism. Harvard University Press, 1972.
- Dudley, Underwood. Numerology: Or What Pythagoras Wrought. Mathematical Association of America, 1997.
- Rochberg, Francesca. The Heavenly Writing. Cambridge University Press, 2004.
- Campion, Nicholas. A History of Western Astrology, vols. I–II. Continuum, 2008–2009.
Reference and technical sources
- “Empedocles.” MacTutor History of Mathematics Archive, University of St Andrews.
- “What Is Gematria?” Chabad.org.
- Locker, Melissa. “NASA Elegantly Shuts Down Those New Zodiac Star Theories.” TIME, July 17, 2020.
Technical data
- Astrodienst. Swiss Ephemeris documentation (based on NASA JPL development ephemerides).
- IANA Time Zone Database (tz), including historical daylight saving rules.