♆ Free Neptune Sign Calculator
Umbriel's free Neptune sign calculator finds your natal Neptune (the planet astrologers read for imagination, longing and what dissolves: where the edges blur), with its sign, exact degree and house, from your birth date, time and place.
Free, no account, no email. Runs in your browser.
14160+ people cast their chart here in the last 30 days.
No account, no email. Neptune is worked out from the planet's own orbit, to within a few arcseconds.
MODERNA modern technique: twentieth-century astrology.
- What you'll needBirth date (time and place for the house)
- What you getYour Neptune sign and exact degree, the house it falls in, whether it was retrograde, and every aspect it makes
- CostFree, no account required
What a Neptune sign is
Neptune was found on 23 September 1846 at Berlin, after its pull on Uranus had been worked out on paper. Your Neptune sign is where it stood at your birth. Astrologers read it for imagination, longing, idealism and the things that will not stay sharp: where you dream, and where you are inclined to see what you hope to see.
Deeper.a one-breath read
Neptune takes about 165 years to go round the Sun and spends roughly fourteen years in each sign, so a whole generation shares one. It was in Capricorn from 1984, settled into Aquarius in 1998, Pisces in 2012 and Aries in 2026. It turns retrograde each year, and near a border it can step over the line and back for a few months before it settles, so a birth in 1998, 2011, 2012, 2025 or 2026 needs the exact day.
The house and the degree are what make a Neptune personal, and the house needs a birth time and place.
How Umbriel computes it
Deeper.a one-breath read
Umbriel computes Neptune from the VSOP87 series for its orbit, for the moment of your birth, and converts it to a longitude seen from Earth. Umbriel's own check against NASA's JPL ephemeris, 1910 to 2044, finds it within a few arcseconds, and it puts Neptune's final entry into Pisces on 3 February 2012, within a quarter of an hour of the time printed in a published ingress table. Near a sign edge Umbriel says so and names both signs. The house needs your birth time and place; without a time, Umbriel gives the sign and leaves the house out.
What's in your result
Deeper.a one-breath read
- Sign and degreeWhere Neptune stood at your birth, with a plain warning if it sits within a degree of the next sign.
- The house it falls inThe part of life where the dreaming tends to show up. This is the part that needs your birth time.
- Retrograde or directWhether Neptune was moving backwards at your birth.
- Uranus and Pluto beside itThe other two generational planets, one tap away in the same chart.
- Your whole chartThe Sun, Moon and Rising sign on the same page.
Don’t know your birth time?
Deeper.a cup-of-tea read
Know it roughly? Give the time and say where it came from (a certificate, a parent’s memory, or something rough like “early morning”), and your chart tells you what could change within that window.
Don’t know it at all? Umbriel does not fill the gap with a guess. Tick “I don’t know the time at all” and it checks your whole birthday, hour by hour, then tells you two things: which placements are the same whatever time you were born, as exact as they would be if you knew the minute, and which are down to two signs, both named, so you know what a parent’s memory would settle.
The Ascendant, the Midheaven and the houses are left out rather than approximated. A birth time is the one thing they cannot be computed without, and an approximate Rising sign that looks exact is worse than no Rising sign at all.
Common questions
What does my Neptune sign mean?
Modern astrology reads Neptune for imagination, idealism, longing and what is hard to pin down. A Neptune in Capricorn is often read as a dream of structure and order, a Neptune in Aquarius as a dream of a better collective. Best held as a question to think with, not a verdict.
How long does Neptune stay in a sign?
About fourteen years, because it takes about 165 years to go round the Sun. Near a border its retrograde loop can take it back over the line for a few months, so a birth in that window needs the exact date.
Which signs has Neptune been in?
Capricorn from 1984, then it settled into Aquarius in 1998, Pisces in 2012 and Aries in 2026. In 1998, 2011 and 2025 it stepped over a border and back for a few months while retrograde.
Can I find my Neptune sign without a birth time?
Yes. Neptune moves a very small fraction of a degree a day, so the date settles the sign unless it sat right on an edge. What you cannot get without a time is the house, and Umbriel leaves it out rather than guessing.
How accurate is Neptune here?
Within a few arcseconds in Umbriel's own check against NASA's JPL ephemeris (1910 to 2044). Near a sign edge, Umbriel names both signs.
Is this Neptune sign calculator free?
Yes: sign, degree, house and retrograde status, with no account and no email, calculated in your own browser.
What if I don’t know my birth time?
Umbriel checks your whole birthday hour by hour and separates what is certain from what is not. Placements that are the same whatever time you were born are shown as exact. Placements that changed sign during the day are shown as two named signs, so you know what a parent's memory would settle. The Ascendant, Midheaven and houses are left out rather than approximated. They cannot be computed without a time, and an approximate Rising sign that looks exact is worse than none.
Do I need an account or an email address?
No. There is no sign-up, no email capture and no free trial. Enter your details and the result is drawn in your own browser.
Go deeper
Every one of these is a page in its own right — written out, not generated on the fly.
Related free tools
Next doorPluto Sign CalculatorUmbriel's free Pluto sign calculator finds your natal Pluto (its sign, exact degree and house) from your birth date, time and place.Prints in the head of this page, all public domain except where stated: Four signs of the zodiac: Pisces (the fish), Libra (the scales), Scorpio (the scorpion) and Taurus (the bull). Gouache painting by a Persian artist, [between 1800 and 1899?], Wellcome Collection; Urania's Mirror, Sidney Hall, 1825, Library of Congress via Wikimedia Commons; Johannes Hevelius, Machina coelestis, Danzig, 1673, Observatoire de Paris copy via Gallica (BnF). Ground: Albrecht Dürer, Melencolia I, 1514, printed mirrored and faint.
Further down the page: Diana Presiding over Navigation and Fishing, from Seven Planetary Gods, Jan Saenredam, 1596, Art Institute of Chicago. The next-door print comes from that page's own head. The pointing hand: a pointing hand, after a medieval manuscript margin (line art by Jerimee).
Umbriel offers every system here as a set of prompts to think with, never as a statement of fact about who you are. Take what's useful, leave the rest.