Natal chart calculator
Enter a birth moment and a birthplace, and get the planets in signs and houses, the Ascendant and Midheaven, the twelve Placidus cusps and the major aspects — with the conventions used printed underneath.
Free, no account. Birth data goes only to this site's own endpoint; the chart is not stored and never enters the URL.
Three steps
Enter the exact moment
Date, clock time and the UTC offset in force that day. An unknown hour still gives correct planets but wrong houses, because the Ascendant moves a full sign roughly every two hours.
Enter the birthplace
Latitude and longitude decide the Ascendant and the Placidus cusps. A preset city fills both in; the coordinate fields exist for births that happened elsewhere.
Check the result against the rules
The chart lists the ephemeris, zodiac, house system, true-solar-time shift and orbs it used. If another site disagrees, compare those five lines first — nine out of ten differences start there.
What each block tells you
The same four blocks answer different questions. Reading them in this order keeps a chart from turning into a list of labels.
Ascendant and MidheavenThe two angles the twelve houses hang on.
The Ascendant is the degree rising on the eastern horizon at birth; the Midheaven is the degree culminating overhead. They set the frame the houses are laid out from, which is why they are printed before anything else.
Ascendant and Midheaven →Twelve cuspsUneven in Placidus, because they follow rising time.
Each cusp is the starting degree of a house. Placidus divides the sky by how long a degree takes to rise, so houses are uneven: near the equator they are close to equal, and beyond the polar circles the system has no solution at all — which is why this page refuses to cast a chart there instead of falling back silently.
Twelve cusps →Planets in signs and housesSign and house are independent coordinates.
The sign says where on the ecliptic a planet sits; the house says which area of life the chart assigns it to. The two are independent: a planet can share a sign with another and still fall in the next house.
Planets in signs and houses →Major aspectsA fixed angle, with an orb of tolerance.
An aspect is a fixed angle between two planets — 0°, 60°, 90°, 120°, 180°. The orb is how far the actual angle sits from that ideal; the smaller the orb, the tighter the aspect. Orbs are a convention rather than a measurement, so this page prints the ones it used.
Major aspects →
FAQ
Why does another site give me a different Ascendant?
Usually one of three things: a different house system, a different UTC offset (daylight saving is the classic), or a true-solar-time correction this page has switched off. The conventions block under the chart lists all five inputs, so the difference is usually visible in one line.
Can I cast a chart without a birth time?
The planets will be right to within a fraction of a degree, but the Ascendant and the twelve cusps will not be, and neither will any planet's house. This page asks for a time because it prints houses; an untimed chart would be a different page.
Which zodiac do you use?
Tropical — measured from the vernal equinox, the convention used in most Western practice. A sidereal (Lahiri or Fagan-Bradley) chart would shift every longitude by roughly 24°, so the two are not interchangeable.
Why is Chiron missing?
Chiron's orbit needs a dedicated ephemeris file that a pure TypeScript engine cannot reproduce at usable precision. Rather than print a plausible-looking number, the chart lists it under "Not computed".
Is the birth data stored?
No. It is sent to this site's own endpoint for the calculation and discarded; nothing is written to a database or a log, and the data never appears in the URL, so it cannot be shared by copying a link.