Free tools
Astrology calculators that actually calculate
Some “calculators” on the internet are lookup tables in disguise. They ask for your birth date, match it against a fixed range, and hand back a sign. That works right up until your birthday falls near a cusp — which is exactly when people go looking for a calculator in the first place.
These compute the real positions of the planets for the birth details you provide, from astronomical data professional astrologers use. Every one of them is free, and none of them require an account.
Your Big 3 — and the full Big 6
Sun, Moon & Rising Calculator
The one most people want first. Enter your birth date, time and place and get your Sun, Moon and Rising, plus Mercury, Venus and Mars.
What it needs: Date, time and place
Plus Mars and Mercury, in the same tool
Venus Sign Calculator
How you love, what you chase, and how you think — the three personal planets that shape relationships. Computed from a real ephemeris; add your birth time on an ingress date.
What it needs: Date and place; time optional
Want all of it in one place?
A free ZodiScope account saves your birth details once and gives you your complete chart — all ten planets, twelve houses and the aspects between them — plus daily readings written against your own placements rather than your Sun sign alone.
Create a free accountKeep reading
- · What every placement in your chart means: the birth chart guide.
- · The twelve houses, explained: natal chart houses.
- · How you love, sign by sign: Venus sign meaning.
- · The sign behind your first impression: what is my rising sign?