# SCIENTIFIC VASTU PRINCIPLE | AAYADI (DIMENSION) | An Architect Explains

After the Selection of Site, it is advisable to apply Vastu principles and tips to the design of the building. This will ensure a proportionate, aesthetic and beautiful building with the right measurements. The Vastu principle ‘Aayadi – dimensions’ prescribes six formulae to work out the right dimensions (length, breadth and height) of a building.

Explained here is the Vastu Principle – Aayadi or dimension. The Vastu principle – Aayadi is one of the five Vastu Principles which are a guide for designing and planning proportionate, aesthetic and beautiful buildings with the right measurements. Since Vastu is a science, it is based on logic and reasoning.  As an Architect, I have explained this principle from a scientific view point.

###### WHAT DOES THE VASTU SHASTRA PRINCIPLE, AAYADI MEAN?

Though the science of Vastu follows generic rules for the design of spaces, a specific set of six formulae called Aayadi are used to work out the Length, Breadth, perimeter, area and the height of the building. Here, the length and breadth mean the outer measurements of the foundation seen above the ground. The height of the building is considered to be from the bottom of the base to the topmost point of the building. Like the other Vaastu principles, it was necessary that one follows the Aayadi formulae strictly in order to experience positive effects within the building. In fact even today, Aayadi is the only aspect of Vaastu Shastra that is followed in many parts of India.

Aayadi constitutes six formulae Aaya, Vyaya, Yoni, Raksha, Vara and Tithi which are explained below. The remainder obtained by using these formulae determines whether it is a gain or loss. If it is a gain, then the structure is proportionate and stable and the dimensions are right. However if it is a loss, then  it means the dimensions are not right and should be suitably corrected.

1. Yoni is the remainder of  Breadth x 3 divided by 8
2. Vyaaya is the remainder of  Breadth x 9 divided by 10
3. Aaya is the remainder of  Length x 8 divided by 12
4. Raksha is the remainder of  Length x 8 divided by 27
5. Vara is the remainder of  Height x 9 divided by 7
6. Tithi is the remainder of  Height x 9 divided by 30

###### HOW DOES ONE FIX/CHECK THE DIMENSIONS OF A BUILDING USING THE AAYADI FORMULAE?

One can use the Aayadi formulae to check whether the length, breadth and height of the proposed building are in proportion. Accordingly, the dimensions of the length, breadth or height can be corrected.

BREADTH: The Yoni and Vyaya formulae are used for fixing the breadth of the building. If the  remainder obtained in the Yoni formula is an odd number, then it is good whereas if it is even, then it is considered bad Yoni. 1, 3, 5 and 7 remainders are considered good Yoni and associated with the directions East, South, West and North, respectively. Therefore depending on the direction the building faces, the corresponding Yoni should be used to fix the breadth of the building/rooms. Also, the Yoni of the first floor should  be the same as the Yoni of the ground floor. When an old house is being renovated, then a new Yoni different from the Yoni of the old house should be used for the renovated house.

LENGTH: Aaya, Vyaya and Raksha formuale are used to fix the Length of the building/rooms. Aaya also known as ‘Aadhayam’, means income and ‘Vyaya’ means loss or expenditure. Therefore, the Aaya should always be greater than the Vyaya.  Using the Aayadi formulae it has been concluded that for the Aaya to be more than the Vyaya the length of rooms/building should preferrably be 1.5 times the breadth or at least 1.375 times the width. This is why we find that sites are generally not square but rectangular with a Length 1.375  – 1.5 times the Breadth. For example: Sites have dimensions of 40 x 60, 30 x 40 and 50 x 80.

ORIENTATION: The Yoni formula defining the breadth measurement is useful for buildings that are not oriented to the cardinal directions. Vastu Shastra clearly emphasizes the importance of orienting the buildings to the four cardinal directions (North, East, South or West). As far as possible, buildings should not be oriented to the intermediate directions. But in rare situations, if the site faces an intermediate direction, the 1 Yoni should be used for fixing the breadth of the building.

The Scientific Reasoning- The ancients were aware of the power of monsoon winds and other energies (physical and metaphysical) on structures. Scientifically, it was seen that if the 4 faces of the buildings were oriented towards the cardinal directions, they could withstand the impact of these energies and also benefit from them. In fact most religious buildings, palaces, cities, villages and roads of ancient India and many other parts of the world have been found to face the cardinal directions. Examples: the Giza and Great pyramids of Egypt are all oriented to the North. So if it was  not possible to orient a building to the cardinal directions, it was important that the dimensions of the building should be such that it can withstand the forces of nature. This is where the Yoni (Breadth) calculation was useful.

HEIGHT: The height of the building can be fixed using the Vara and Tithi formulae. The height of the first floor should not be more than that of the Ground floor. For arriving at the right height of a building, the ‘Proportion’ should also be considered. This has already been explained in the post Vastu Principle Maana Proportion.

###### WHY WAS IT NECESSARY TO FIX DIMENSIONS ACCORDING TO AAYADI IN VASTU SHASTRA?

The Scientific Explanation: One reason was  that, in those days the units of measurement were not uniform in different regions. The units of measurement were Angula (3/4 of an inch) and Hasta ( 18 inches) so that 1 Hasta equals 24 Angulas. However the value of Hasta and Angula were different in different regions. Therefore, by using the Aayadi formulae for fixing the dimensions of a building, the risk of creating disproportionate spaces was eliminated.

Another reason was that these formulae were formulated in order to make it easy for the Architect to create rooms with the right sizes for the correct fit of tiles on roof purlins and roof purlins on rafters and rafters on the walls of the rooms, since in olden days, most houses had tiled roofs with wooden rafters and  purlins.

Typically in any wooden roof construction, the inclined roof rafters rest on the lintels/walls/under-purlins and are typically spaced at 18″ or 24″ centre to center or closer. Horizontal roof-purlins are placed on top of the rafters,to which both the top roof tiles and the decorative ceiling tiles are fixed.  Since the whole roof system is visible from the inside of the house, care is taken to have neat joints and decorative rafters, purlins and ceiling tiles. So for such precision work it was ideal that the room dimensions be in multiples of the rafter /purlin/tile spacing.

This post about the ‘Vastu Shastra principle | Aayadi – Dimensions‘, explains the six formulae used for fixing the dimensions of  a building. The dimensions, Length x Breadth x Height, are related to the form/shape of the building. Read about the different forms of buildings in the post, “Vastu Shastra principle | Chanda – Aesthetics”, here:

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### 22 thoughts on “SCIENTIFIC VASTU PRINCIPLE | AAYADI (DIMENSION) | An Architect Explains”

• November 17, 2010 at 4:01 am

how to calculate the pereferable height for a home L = 1751cm & W = 1525 cm
Hi Anish,
You can read the detailed explanation given by a vastu expert Mr Pradeep Mannil in the comments section of this post.

• May 18, 2011 at 12:50 am

In the ayadhi the calculation of yoni aaya and vyaya is clear but the rest is not given properly can you give an illustration for the same.
Hi Jayan
You can read the detailed explanation given by a vastu expert Mr Pradeep Mannil in the comments section of this post.

• June 11, 2011 at 1:13 am

What is the method to arrive the remainders of length and breadth resply?

• June 21, 2011 at 8:06 am

we planned to construct company we planned to 30 feet X 100 feet by asbestos sheetplease guide me what will be height lenght and breath
Hi Ramamurthy,
I have attempted to find a scientific explanation for the reason the ancients followed aayadi formulae, in Vastu Shastra. But I do not personally follow these rules in my designs as they are not practical and I do not understand them. So I will not be able to help you. But if there is any vastu expert on this forum, you are welcome to give your opinion. One such expert Mr Pradeep Mannil has explained in detail in the comments section of this post.

• March 22, 2012 at 3:50 am

Hi,

We are constructing one house.Hw to consider the vasthu width and lenght?we saw the vasthu size in website in

feet.should we consider full building size or only room sizes as per vasthu sizes.what about portico.is it included in the vasthu size?we are under assumption that over all building size (without portico) should be as per vasthu size.is it correct?our overall building length comes to roughly 50 feet.but no good points for this size.otherwise if we consider only room size for vasthu, we can fix our Hall room size at 33 then good points on this size.
pls advise me.vasthu will be considered for room wise or full building wise?
S.Suresh.(08904078438)
Hi Suresh,
I have attempted to find a scientific explanation for the reason the ancients followed aayadi formulae, in Vastu Shastra. But I do not personally follow these rules in my designs as they are not practical and I do not understand them. So I will not be able to help you. But if there is any vastu expert on this forum, you are welcome to give your opinion. One such expert Mr Pradeep Mannil has explained in detail in the comments section of this post.

• May 17, 2012 at 12:07 am

hi what should be the bed room size length and breadth according to vastu
Hi Jatinder,
As a thumb of rule, the length to breadth ratio of a space/room should ideally be 1.375 to 1.5 for it to be efficient.

• August 17, 2013 at 10:58 pm

The measurement of North to south is 13 sq feet and the measurement of East to west is 15 sq feet .pl tell me the result is it good or Bad.
Hi Ramesh Babu,
Please refer to the detailed explanation given by a vastu expert Mr Pradeep Mannil in the comments section of this post.

• October 31, 2013 at 1:29 am

one example :for calculating yoni , same example can be used for other ayyadi calculations too.
perimeter of the house : lenght : 1554 cms , width: 1338

so perimeter is 2(1554+1338)=5784 convert this to hasta by dividing the same by 72
(24 angulas are one hasta, 1 angula = 3 cms, therefore, 1 hasta = 72 cm)
which equals = 80.33 and in dwjayoni

to know the yoni multiply the perimeter by 3 and divide by 8,
So 80.33 x 3 = 241 hastha
when 241 is divided by 8, the reminder is 1 so the perimeter is dwajayoni which can be useful for all directions
if your house faces east yoni of 5 or 1 can be used
if your house faces west only yoni of 1 should be used
if your house faces south yoni 7 should be used
if your house faces north yoni of 3 should be used

yoni changes as per direction . they are the reminders when you mulitply the perimeter by 3 and divide by 8 you get the yoni. avoid yoni 2 4 8 which is bad.
Thank you for the detailed explanation. I am sure many of my readers will be benefited by these calculations.

• December 4, 2013 at 3:44 am

i have PLOT OF east-west(18 foot) and north-south (45 foot) i request you for best aya in this area to construst new residential house in south side is road. my rashi is kanya nakshtra is uttara i choice dwajaya (15*39) aya. in aya incluing walls of two sides or not ex: in 15 foot including wall or excluing wall please you tell me.
I am not sure if the rashi or nakshatra is taken into account in Vastu Shastra because a house is inhabited by many members of a family with different nakshatras. But for detailed information on aayadi calculation, please refer to the explanation given by Mr Pradeep Mannil in the comments section of this post.

• January 30, 2014 at 12:34 pm

i have the following room size
3415*3905
3025*2900
3750*2800

i have the option to change the size of the room and can reduce the size of 1st and last room and enlarge or reduce the middle one please advice
Hi Amit,
Please refer to the detailed explanation given by a vastu expert Mr Pradeep Mannil in the comments section of this post.

• September 5, 2014 at 4:34 am

My site east20*narth 30.
How to calculate aaya,
Hi Raghavendra,
You can read the detailed explanation given by a vastu expert Mr Pradeep Mannil in the comments section of this post.

• December 29, 2014 at 3:26 am

Is the square rooms auspicious. I have designed rooms measuring 14 feet x 14 feet in my house and one room of 12 feet x 12 feet. The plot on which construction is to take place is east facing. Pradeep Mannil’s explanation is just for calculating yoni.
What is dwjayoni?
Why two formulaes for each length, breadth and height? which to follow?
What about the remainders in the other formulaes? (Vyaaya is the remainder of Breadth x 9 divided by 10)
Harjeet Mann
Hi Harjeet,
It is recommended to have square or rectangular rooms in Vastu Shastra. But as an architect, I prefer using rectangular modules in the design of houses as they are more proportionate and better used. I do not know dwjayoni – it must be the same as yoni. In this post, I have attempted to find a scientific explanation for the reason the ancients followed aayadi formulae, in Vastu Shastra. But I do not personally follow these rules in my designs as they are not practical and I do not understand them. So I will not be able to help you.

• December 30, 2014 at 2:26 am

We r planning to construct a home. Our site dimensions is east facing 26feet and south facing is 27feet. I want to know that aaya of our site
Hi Sunitha,
You can read the detailed explanation given by a vastu expert Mr Pradeep Mannil in the comments section of this post.

• March 17, 2015 at 2:57 am

@sunitha,
Hi,
Aayam and vyayam is claculated for the house . not for the plot.

• March 17, 2015 at 11:14 pm

Hi,
For those who need auspicious perimeter, aaya vyya, age please use the vasthu calculator from the given link below. it can be used to find the perimter of the plot, house and rooms.
Please note when say remiander 1 (dwajayoni) it can be used for all directions.
3 is for south facing house . The facing of the house is calculated towards the courtyard. So in the measurements calculations which show south is for a house exactly facing north.
the link is given below. the excel file can be downloaded and can be used for finding the auspicious perimeters.
Regards
Thanks Pradeep for the info. All of you who have doubts regarding calculations, refer to this.

• April 5, 2015 at 6:01 am

Namaste,
if in the north-east side, we leave some area for car parking under the same pillars, shouid that area be included in calculating the aaya? Plz help
Hi Krishna,
In calculating Aaya, consider the outer dimensions of the foundation of the building. You do not need to consider the porch area unless there is a foundation under the porch which is connected to the main building.

• October 6, 2015 at 3:31 am

Sir,

Is this dimensions are to be measured in outer surface of building including the tiles / after surface finishing?
(or) Is this dimensions are to be measure at the foundation / Columns at the start of construction?
Hi Srinivasu,
The dimensions mentioned here are with respect to the foundation and structure. Not with finishing.

• December 28, 2015 at 6:35 am

Hi,
I have a west facing house (inclined 13degree towards southwest). The existing perimeter of the house is 4962 cm. now I want to construct another floor on top of it. As per the calculation of Pradeep mannil the yoni should be 1. Can correct the perimeter to 5016 cm from existing 4962 cm. expecting reply.
Thanks
Sujith( my birth star is revathi)
Hi Sujith,
Since you seem to be keen on going by exact dimensions and yoni etc, it is better you consult a vastu expert on this matter. I am only interested in interpreting Vastu Shastra as a science and not as something to be followed exactly out of superstitious fear.

• June 24, 2016 at 7:34 am

Sir,
If I will send a rough plan(by mail) of my house can you correct its dimensions as per vastu ?
Thanks, K.R.Vasudevan.
Hi Vasudevan,
I am not a vastu specialist and I do not comment on the vastu aspects of a plan.

• July 29, 2016 at 8:55 am