Astrology Calculators — Astrology
Chart placements by birth date and time: birth chart, sun, moon, Mercury and Mars signs, and Mercury retrograde periods. Sign boundaries shift by a day between years, so exact birth time and location change the result.
All Astrology Calculators
Generate a basic natal birth chart showing planet positions in signs and houses.
Calculate your Mars sign for insights into your drive, ambition, and conflict style.
Find the dates of past and upcoming Mercury retrograde periods.
Calculate your Mercury sign for insights into your communication and thinking style.
Calculate your moon sign from birth date, time, and location for emotional astrology.
Calculate your rising sign (ascendant) from exact birth time and location.
Calculate when your Saturn return occurs — a major astrological transit around ages 29 and 58.
Calculate your Venus sign for insights into your love style and relationship patterns.
Check romantic and friendship compatibility between two zodiac signs.
Find your zodiac sun sign from your exact birth date including cusp dates.
About Astrology Calculators
Chart placements by birth date and time: birth chart, sun, moon, Mercury and Mars signs, and Mercury retrograde periods. Sign boundaries shift by a day between years, so exact birth time and location change the result.
Whether you need to solve a one-time problem or verify your own calculations, these free tools cover the most common astrology scenarios. All results are computed in your browser — no data is sent to any server.
What You Can Calculate
This section includes 10 tools: Birth Chart Calculator, Mars Sign Calculator, Mercury Retrograde Calculator, Mercury Sign Calculator, Moon Sign Calculator, Rising Sign (Ascendant) Calculator by Birth Time, Saturn Return Calculator, Venus Sign Calculator, and 2 more. Each calculator is free to use with no signup required.