---
title: "Numerology Calculator (Pythagorean and Chaldean)"
slug: "numerology-calculator"
canonical_url: "https://mahadasha.com/numerology-calculator"
type: "calculator"
description: "Compute every core numerology number from a name and a date of birth: Life Path, Birthday, Expression, Soul Urge, Personality, Naamank, Maturity, Balance, Karmic Lessons, Karmic Debts, Hidden Passion and Planes of Expression. Pythagorean and Chaldean are computed side by side and the response lists exactly where they diverge."
---

# Numerology Calculator (Pythagorean and Chaldean)

Compute every core numerology number from a name and a date of birth: Life Path, Birthday, Expression, Soul Urge, Personality, Naamank, Maturity, Balance, Karmic Lessons, Karmic Debts, Hidden Passion and Planes of Expression. Pythagorean and Chaldean are computed side by side and the response lists exactly where they diverge.

The Life Path uses component reduction (month, day and year reduced separately, then summed), not digit-string summing. Master numbers 11, 22 and 33 are held at core positions only. Chaldean never assigns a letter the value 9, so Karmic Lessons and Hidden Passion are computed in Pythagorean only.

## Inputs

- **birth_date** — date of birth (`YYYY-MM-DD`). **No time, place or timezone required.**
- **name_at_birth** *(optional)* — full name as given at birth, in Latin letters.
  Drives Expression, Soul Urge and Personality.
- **name_in_use** *(optional)* — the name used day to day. Drives the Naamank.
- **system** *(optional)* — `pythagorean`, `chaldean` or `both` (default `both`).
- **y_mode** *(optional)* — `heuristic` (default), `vowel` or `consonant`. Controls
  whether Y counts as a vowel, which moves Soul Urge and Personality but never Expression.

## Programmatic access (for AI agents)

This calculator is backed by a JSON API — agents should call it directly instead of the HTML form:

- **Endpoint:** `POST https://mahadasha.com/api/v1/numerology/core`
- **Auth:** JWT Bearer token — register at `https://mahadasha.com/api/v1/auth/register`
- **OpenAPI schema:** https://mahadasha.com/api/v1/openapi.json
- **API catalog:** https://mahadasha.com/.well-known/api-catalog
- **MCP server card:** https://mahadasha.com/.well-known/mcp/server-card.json

Refer to the OpenAPI schema above for the exact request body and response shape of `https://mahadasha.com/api/v1/numerology/core`.

> Human UI: [Numerology Calculator (Pythagorean and Chaldean)](https://mahadasha.com/numerology-calculator)