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EsperOwl
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Free tool

Free natal chart calculator

Enter a date, a time and a place of birth. You get the wheel, every planetary placement with its sign, degree and house, the house cusps and angles, and a full aspect grid with orbs — not a paragraph of generic description.

Birth details

Optional. Labels the chart, and is never sent anywhere.

We will use noon and mark the houses and angles as unreliable, because without a time they are.

Start typing a city, then pick it from the list.

Positions are computed with the Swiss Ephemeris. Astrology is not a science, and nothing here is medical, legal or financial advice.

Natal chart questions

Can I get a birth chart without knowing my birth time?
Yes, with a real caveat. Tick “I do not know the birth time” and the chart is cast for noon: every planet except the Moon will be in the right sign and close to the right degree, and the Moon will be within about seven degrees. The houses, the Ascendant and the Midheaven will not be reliable, because those rotate through the whole zodiac in twenty-four hours. We mark them rather than hiding it.
How accurate does the birth time need to be?
Four minutes of clock time moves the Ascendant by roughly one degree. If your time is right to the nearest five minutes, the signs on your house cusps are almost certainly correct. If it has been rounded to the nearest hour, treat a cusp near the edge of a sign as unsettled.
Which house system does this calculator use?
Placidus by default, because it is what most English-language astrology assumes and what most books are written against. Whole Sign, Koch, Equal, Campanus, Regiomontanus, Porphyry and Topocentric are all in the dropdown. The planets never move between systems — only the house boundaries do.
Do I need an account or an email address?
No. The chart is calculated and rendered for you and nothing is stored. Signing in is only worth it if you want a chart library that follows you into the apps.
Does this work for southern-hemisphere or high-latitude births?
The southern hemisphere is handled normally. Above roughly 66° north or south, Placidus and Koch are mathematically undefined for part of the year — if you were born inside the Arctic or Antarctic circle, use Whole Sign or Equal, which are defined everywhere.

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