Free grand cross calculator

Do you have a grand cross? And how tight is yours?

About 14 in 100 charts have a grand cross at the orbs usually allowed. A tight one is rare, and about 1 in 660 has every side within 1°. Enter your birth details and we'll check yours.

This is just one shape. Your whole chart shows you your birth chart drawn out, your Sun, Moon and rising sign, and the one shape in your chart that is most worth a closer look.

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Here is the same check for the other shapes. You can open any of them to see yours in detail.

If you'd like a reading, the options are at the bottom of this page.

Would you like to look closer?

A reading is created from the whole of your chart, not just one shape. Your birth details are already here, so the form below takes you straight to a secure payment page.

It arrives in a private learning portal, with a chat function you can ask about it. If you are not sure what a reading looks like, you are welcome to read three chapters from a real one, which is my own.

Your reading · ~~usually £90~~ £60 special offer An in-depth reading of every part of your chart and how they work together, chapter by chapter, with diagrams drawn from your chart. It includes the areas of your life, such as home, work, money and partnership. The full unlock · £180 Your reading tells you what your chart holds, and this takes you into it. It is your reading, the areas of your life included, with what's live for you now added. The planets have kept moving since you were born, and as each one passes over a place in your chart, that part of you tends to come to the front for a while. This looks at the next six months and shows which parts of your chart are being reached, how closely, and when. As each date arrives, you can check it against your own life. It comes with a practice companion: guided practices drawn from your own reading. If you have already paid for a reading, what you paid is taken off the £180. This one is made to order, so there's nothing to pay now and I'll reply by email.

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You'll be taken to a secure Stripe page to pay £60 by card. Your reading is delivered within 7 days of my starting it, and you can cancel for a full refund within 14 days of paying, until I start. The terms cover cancelling and refunds.

If you'd like to ask me something first, you're welcome to get in touch.

What is a grand cross?

Four points in a chart sit a square (90°) apart around the wheel, making two oppositions that cross at right angles. The four usually fall in signs of the same modality, cardinal, fixed or mutable, and the grand cross is named after it.

Four parts of you pull against one another in two crossing lines, so wherever you push, you push against something. Astrologers call this a grand cross. It's less common than a T-square, and it's stronger: it's two T-squares locked together, with no easy way out.

It tends to feel like sustained effort, and people with a tight one often say they've felt tired for longer than they can remember. It also tends to build unusual strength, the kind that comes from carrying weight for a long time. The work is rarely to resolve it. It's usually to stop spending energy on trying, and to notice how much you already hold steady.

How common is a grand cross?

Here's how often it turns up, and how quickly that falls as the sides get tighter, measured across 100,000 random birth charts from 1930 to 2025:

Grand cross	Charts with one
Any grand cross, at the orbs usually allowed	14 in 100
Every side within 2°	about 1 in 120
Every side within 1°	about 1 in 660
Every side within half a degree	about 1 in 3,200

We count the planets, the Moon's nodes, Chiron, the Part of Fortune, the Vertex and the angles. The tighter the sides, the less common it gets, which is what the figure in your result measures.

Questions

Is a grand cross rare?

It's less common than most shapes, but not rare at the usual orbs. Measured across 100,000 random charts, about 14 in 100 have one. A tight one is rare, though, and about 1 in 660 has one with every side within 1°.

How is a grand cross different from a T-square?

A T-square has three points, which are an opposition with both ends square to a third. A grand cross fills in the missing fourth point, so there are two oppositions crossing at right angles and no open side for the pressure to go.

What does "1 in X charts have one this strong" mean?

We scored a million random charts the same way as yours and counted how many have a grand cross at least as tight, and the figure is that share. Below about 1 in 20 we use a word instead of a number, because a figure that small doesn't tell you much.

What if I don't know my birth time?

The calculator still works, but a grand cross that involves your Moon or your rising sign can't be placed, because both move too far in a day. If that's possible for your chart, it tells you it can't be sure, rather than saying no.