Personal natal chart
Birth chart calculator with transparent evidence
Enter accurate birth details to calculate planetary placements, chart angles, houses and major aspects before interpretation begins.
Calculate your birth chart
Enter your birth date, exact time and birthplace to calculate a tropical chart preview with the Sun, Moon, rising sign and strongest major aspects.
Calculator input: Birth date, exact birth time and birthplace are required for a reliable rising sign and house calculation.
Result preview: The preview shows calculated tropical placements and major aspects. A full private reading adds houses, evidence and interpretation.
This interactive calculator runs in the browser after the page loads. Inputs are calculated for the request and are not saved by the public preview.
Information needed for an accurate chart
Use the birth date, the most accurate available birth time, and the city or coordinates of birth. The location establishes timezone and geographic inputs for house calculations.
When birth time is unknown, the tool can still calculate many planetary positions, but angle and house results should be treated cautiously.
What the result includes
A complete Western result can include the Sun, Moon, planets, Ascendant, Midheaven, house placements and major aspects with measured orbs.
ReadAstrology also preserves calculation evidence so an interpretation can be traced back to exact chart data.
Birth chart privacy
Birth profiles and calculated results are stored only for the authenticated user unless the user explicitly creates a privacy-filtered share.
Frequently asked questions
What is a birth chart?
A birth chart is a map of calculated planetary positions and chart angles for a specific birth date, time and place.
How accurate does the birth time need to be?
A time from a birth record is preferred. Even a small difference can change the Ascendant degree and house cusps.
Is a birth chart the same as a natal chart?
Yes. Birth chart and natal chart are commonly used for the same calculated chart.