---
title: "Personal Year, Month and Day Calculator"
slug: "personal-year-calculator"
canonical_url: "https://mahadasha.com/personal-year-calculator"
type: "calculator"
description: "Compute the Personal Year, Personal Month and Personal Day cycles, the nine-year forecast strip, the four Pinnacles and Challenges with their age ranges, the three life periods, and the Essence from transiting name letters."
---

# Personal Year, Month and Day Calculator

Compute the Personal Year, Personal Month and Personal Day cycles, the nine-year forecast strip, the four Pinnacles and Challenges with their age ranges, the three life periods, and the Essence from transiting name letters.

The Personal Year runs with the calendar year and changes in January. A minority school rolls it on the birthday instead; the response carries a `convention` field so the choice is explicit. Master numbers are never preserved in cycles, so a Personal Year of 11 is a 2.

## 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/cycles`
- **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/cycles`.

> Human UI: [Personal Year, Month and Day Calculator](https://mahadasha.com/personal-year-calculator)