Free house system calculator

Which houses are your planets really in?

If you've made your chart on two websites and found your planets in different houses, nothing is wrong with your chart. The sites are using different house systems. We'll show you three of them side by side, which of your planets keep the same house in all three, and what you can rely on for the ones that don't.

This is only where your planets fall. 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.

See your whole chart

Also in your chart

Here are the shapes your planets make with one another. 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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What is a house system?

The twelve houses divide a chart into areas of life, and each planet falls in one of them. This calculator compares three systems: Placidus, Equal and Whole Sign.

A house system is a way of dividing your chart into twelve areas of life. There are several, and they all start from your rising sign, but they draw the lines in between in different places. So the same planet can be in one house on one website and in the next house on another, and neither site has made a mistake.

What every system shares is the frame the houses hang on: the horizon, and the line that runs from the top of the chart to the bottom. Those two lines are the same whichever system you use, and they cut the chart into four quarters. Where the three systems agree on a house, you can take that house as settled. Where they don't, the quarter is the part you can rely on.

How often do the three systems agree?

Measured across 100,000 random birth charts from 1930 to 2025, counting how many of the ten planets, the Sun to Pluto, fall in the same house in Placidus, Equal and Whole Sign:

Planets that keep the same house	Charts
None of the ten	15 in 100
One to three	32 in 100
Four to six	29 in 100
Seven to nine	22 in 100
All ten	3 in 100

In about 97 in 100 charts at least one planet changes house. Where you were born matters: among charts born more than 45° from the equator, which includes Britain and northern Europe, no planet keeps its house in about 21 in 100, against about 13 in 100 for charts born within 25° of the equator. Your result is compared with charts born at a latitude like yours.

Questions

Why are my planets in different houses on different websites?

It's because the two sites are using different house systems. Every system starts from your rising sign, but each one draws the lines between the houses in its own way, so a planet near a line can fall on either side of it. Your planets haven't moved, and neither site has made a mistake.

Which house system is the right one?

None of them is wrong. They are three ways of dividing the space between lines that every system agrees on. Some people read more than one side by side. In our readings we name a house only where Placidus, Equal and Whole Sign all agree, and otherwise we work from the quarter of the chart a planet is in and how close it sits to one of the four angles.

What are the quarters?

The horizon divides your chart into the half above and the half below. The line from the top of the chart to the bottom divides it into the rising side and the setting side. Together they make four quarters. Those two lines are worked out the same way in every house system, so the quarter a planet sits in doesn't depend on which system you choose.

Why do the systems disagree more in some charts than in others?

The biggest reason is how far into its sign your rising sign falls. Whole Sign starts each house at the beginning of a sign, and Equal starts each house at the exact degree of your Ascendant. With an Ascendant in the first few degrees of its sign the two almost coincide, and with one in the last few degrees they are almost a whole house apart. Placidus also changes with how far from the equator you were born.

What if I don't know my birth time?

Houses can't be worked out without one. Your rising sign moves about one degree every four minutes, and every house is counted from it, so even a rounded time can move a planet across a line. If your time is approximate, treat any planet close to a house boundary as undecided.