Free Online Birth Chart Calculator
Free · No sign-up · No app to install — runs right in your browser
New to astrology? Explore the GuideEnter your birth date, time, and place to generate your natal chart wheel.
Why This Calculator
A Birth Chart That Explains Itself
Most chart calculators hand you a wheel full of symbols and leave you to figure it out. This one talks back: tap anything on your chart — a planet, a sign, a house — and it tells you, in plain English, what that placement means in your chart.
Tap It, Read It
Every point on the wheel is interactive. Tap your Moon and instantly read what your Moon sign and house say about your emotional life — no decoding tables, no hunting through ten other websites.
Written for First-Timers
Interpretations are short, concrete, and jargon-free — what the placement feels like in real life. When a placement hooks you, every reading links to a full beginner-friendly guide so you can go as deep as you like.
The Whole Sky at a Glance
Planets, signs, houses, and aspect lines on one clean wheel, plus a placement table for quick reference. Prefer a different lens? Switch between Whole Sign, Placidus, and Alcabitius house systems anytime.
Birth Chart Questions, Answered
What is a birth chart?
A birth chart (or natal chart) is a map of where the Sun, Moon, and planets were in the sky at the exact moment and place you were born. Astrology reads each placement — planet, sign, and house — as a symbolic layer of your personality, needs, and life themes. Start with your Sun (core identity), Moon (emotional life), and Ascendant (outward style).
What if I don’t know my exact birth time?
You can still generate a chart — your Sun, Moon (usually), and planetary signs don’t depend on the hour. What does change without a birth time: your Ascendant, houses, and angles, which rotate roughly every two hours. If you can, check your birth certificate or ask family; otherwise use 12:00 noon and treat house placements as approximate.
Which house system should I choose?
Alcabitius — this calculator’s default — is the quadrant system of medieval classical practice, and a solid choice whether you’re new or experienced. Placidus is the modern default you’ll see on most websites and reads almost identically in practice. Whole Sign is the oldest tradition (Hellenistic), with each house spanning exactly one sign — but Hellenistic practice pairs it with its own techniques like triplicity lords, so we’d save it for when you go deeper into that school. Switching takes one tap and recalculates instantly.
What if a planet sits right on a house cusp?
Classical practice has a rule for this: in quadrant systems (Alcabitius, Placidus), a planet within about 5 degrees before the next house cusp is read as already belonging to that next house — its influence has crossed over even though the boundary line hasn’t. Our wheel draws strict boundaries, so apply the rule yourself: if a planet hugs the end of a house, read it in the following one. In Whole Sign houses the rule isn’t used, since houses and signs share the same borders.
What’s the difference between my Sun, Moon, and Rising sign?
Your Sun sign is your core identity — the “what” of your personality. Your Moon sign is your emotional nature — how you feel and what you need to feel safe. Your Rising sign (Ascendant) is the style you meet the world with — the first impression you give. All three together explain why two people with the same Sun sign can feel completely different.
How accurate is this calculator?
Planetary positions are computed by a professional ephemeris engine from your exact birth date, time, and place; time zones and historical daylight-saving rules are resolved automatically from your birth city. The same computation powers our paid readings. The calculator itself is free, with no sign-up required.
Do I need to download an astrology app to see my birth chart?
No — this calculator runs entirely in your browser, on any phone or computer, with nothing to install and no account to create. You get the same full natal chart that astrology apps generate: planets, houses, aspects, and tap-to-read interpretations. Unlike most apps, there are no push notifications, no subscription, and your birth data isn’t locked inside an app profile.
Is there a free alternative to astrology apps?
Yes — a browser-based chart calculator like this one is the simplest free alternative to astrology apps. Popular apps usually require an account and keep advanced readings behind a subscription; here the complete chart wheel, all placements, and plain-English interpretations are free with no sign-up. If you later want more depth, the chart links into a full written guide for every placement.