---
title: "Free birth chart calculator with interpretations"
description: "Calculate your natal chart: Sun, Moon, rising sign and every planet, with a chart wheel and plain-language interpretations."
url: "https://12horoscope.com/en/birth-chart"
markdown_url: "https://12horoscope.com/en/birth-chart.md"
lang: "en"
type: "birthChart"
site: "12horoscope.com"
license: "Free to quote and summarize with attribution and a link to the source page on 12horoscope.com."
citation: "12horoscope.com — Free birth chart calculator with interpretations — https://12horoscope.com/en/birth-chart"
alternates:
  en:
    url: "https://12horoscope.com/en/birth-chart"
    markdown_url: "https://12horoscope.com/en/birth-chart.md"
  vi:
    url: "https://12horoscope.com/vi/ban-do-sao"
    markdown_url: "https://12horoscope.com/vi/ban-do-sao.md"
  es:
    url: "https://12horoscope.com/es/carta-astral"
    markdown_url: "https://12horoscope.com/es/carta-astral.md"
  pt:
    url: "https://12horoscope.com/pt/mapa-astral"
    markdown_url: "https://12horoscope.com/pt/mapa-astral.md"
  fr:
    url: "https://12horoscope.com/fr/theme-astral"
    markdown_url: "https://12horoscope.com/fr/theme-astral.md"
  de:
    url: "https://12horoscope.com/de/geburtshoroskop"
    markdown_url: "https://12horoscope.com/de/geburtshoroskop.md"
  it:
    url: "https://12horoscope.com/it/tema-natale"
    markdown_url: "https://12horoscope.com/it/tema-natale.md"
  id:
    url: "https://12horoscope.com/id/peta-kelahiran"
    markdown_url: "https://12horoscope.com/id/peta-kelahiran.md"
  tr:
    url: "https://12horoscope.com/tr/dogum-haritasi"
    markdown_url: "https://12horoscope.com/tr/dogum-haritasi.md"
  hi:
    url: "https://12horoscope.com/hi/janm-kundali"
    markdown_url: "https://12horoscope.com/hi/janm-kundali.md"
---

# Free birth chart

Enter your birth date, time and place. We compute where every planet was at that moment and explain each placement.

This page is an interactive tool in the browser version. [Free birth chart](https://12horoscope.com/en/birth-chart)

Without a birth time we can't calculate your rising sign or houses, and the Moon's sign may be uncertain if it changed signs that day.

Your birth data is used only to calculate this chart. We don't store it.

## Planet positions

Positions are computed with astronomy-engine, an open-source astronomy library accurate to well under an arcminute for the planets. We use geocentric ecliptic longitudes of date — where each body appears from Earth — sampled at 12:00 UTC for daily readings.

Ingresses, retrograde stations, lunations, eclipses and exact aspects are found by searching the ephemeris and are timed to the minute.

## Tropical zodiac

We use the tropical zodiac, the standard in Western astrology: 0° Aries is the March equinox point. Sign dates on this site follow that system.

## Whole-sign houses from your Sun sign

A daily horoscope can't know your birth time, so we use whole-sign houses counted from your Sun sign: your own sign is your 1st house, the next sign is your 2nd, and so on. When the Moon is in the sign two after yours, it's in your 3rd house — the area of communication and short trips.

Your birth chart (from our birth chart tool) is more precise: with a birth time and place we calculate your actual rising sign.

## See also

- [How we write our horoscopes](https://12horoscope.com/en/methodology) · [Markdown](https://12horoscope.com/en/methodology.md)

---

## How this content is made

Planet positions are computed with astronomy-engine (geocentric, tropical zodiac, whole-sign houses counted from the Sun sign). Scores, lucky items and matches are calculated, not written. Readings are drafted by AI from that computed sky brief, checked automatically and edited by people. Astrology here is for reflection and entertainment, not medical, legal or financial advice. [Methodology](https://12horoscope.com/en/methodology).

- **License:** Free to quote and summarize with attribution and a link to the source page on 12horoscope.com.
- **Please cite as:** 12horoscope.com — Free birth chart calculator with interpretations — https://12horoscope.com/en/birth-chart
- If you quote or summarize this page, please link to the source page: https://12horoscope.com/en/birth-chart