Wisdom
Ayadi Calculations
Vãstushãstra stands tall and apart.
Ayadi calculations are a set of Vastu calculations which are made to check the energic suitability of the plot and its relationship with the owner.
• नक्षत्रः (Nakshatra)
• आयः (Aaya – Income Factor)
• व्ययः (Vyaya Expense Factor)
• योनिः (Yoni – Category of the Plot)
• अंशः (Amsha)
• आयुः (Aayu)
• वर्णः (Varna)
• वारः (Vaar)
Ayadi Number of a Plot
Ayadi Number is the perimeter of the property in the given Vastu unit and is the basis of Ayadi calculations. For residential and industrial projects Hasta is the unit which is used which is 0.8382 m in length. For example, a plot whose Perimeter is 80 metres will have Ayadi number 96.
(Hasta which is rounded off to 96 Hasta).
Nakshatra Calculation
The Nakshatra compatibility determines the ruling Nakshatra star of the land and its relationship with the owner’s Nakshatra. The Nakshatra of the land is calculated by the perimeter of the plot.
Aya and Vyaya Calculations
The Aya calculation determines the Income Factor of the land. The Vyaya calculation determines the Expense Factor of the Land. The Income Factor should be greater than the Expenditure Factor.
Yoni Calculation
Yoni means a class or a category. Vastushastra defines eight categories or yonis, and all measurable size belong to one of these eight categories.
The Brahmasthaan  the Central point  always pulsates with cosmic energy and creates a flow of energy in the plot which begins to flow towards the edge of the plot. The flow of energy towards the cardinal directions constitutes four categories, and its flow towards the corner directions constitute the other four categories.
Dhwaja Category (Flow towards East)
Simha Category (Flow towards South)
Vrishabh Category (Flow towards West)
Gaja Category (Flow towards North)
Dhoomra Category (Flow towards SouthEast)
Shwaan Category (Flow towards SouthWest)
Khar Category (Flow towards NorthWest)
Kaak Category (Flow towards NorthEast)
Of these Dhwaja, Simha, Vrishabh and Gaja yonis are auspicious. Plots and houses with dimensions which conform to these yonis enhance financial fortunes, good health, victory and success in competition, and overall prosperity.
Dhoomra, Shwan, Khar and Kaak yonis are best avoided as they are believed to enhance problems like ill health, bad fortunes, loss of money, failure in career, shattered happiness, fractured relationships etc.
Amsa Calculation
The Amsam calculation determines the nature of the land. There are eight Amsam which are described by Maya in his treatise Mayamatam.
1. तस्कर  Thief
2. भुक्ति  Enjoyment
3. शक्ति  Strength
4. धन  Riches
5. नृप  Kingship
6. षण्ड – Enunch, powerless
7. अभय  Fearless
8. विपत Troubles
9. समृद्धि  Prosperity
As the name suggests plots with Amsa of Bhukti, Shakti, Dhan, Nrupa, Abhaya and Samriddhi are good.
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Ayu Calculation
Ayu calculations are made in two ways:

To determine the lifespan of a building or a plot, or the period upto which things will remain harmonious amongst the inhabitants in that property. The Ayadi number is multiplied by 27 and divided by 100, and the remainder indicates the Ayu.

The other is a much more calculation. It indicates the creative or productive quotient of a property. This process has been described in Manushyala Chandrika where the text describes 5 categories of Ayu.
1. बालत्व Childhood
2. कौमार्य Adoloscence
3. यौवन Youth
4. वृद्ध Old age
5. निधन Decease
Varna
Varna calculation indicates the psychological impact of space and the type of activity which it would support.
The first category supports intellectual activities and is suitable for schools, colleges, universities, libraries, centres of advance learning and research activities.
The second category supports all types of administrative activities and is suitable for buildings which house administrative, judicial, parliamentary, governing activities.
The third category supports all types of commercial activities and are suitable for stock exchanges, shopping malls, showrooms, commercial offices.
The fourth category supports all service, support and labour related activities and are suitable for production units and factories, service centres, call centres, agro activities, transportrelated activities.
Vaar
The Vaar calculation determines further compatibility with the owner.
To calculate the Vaar of the property its Ayadi number is multiplied by 9 and then divided by 7. The remainder is Vaar. There are seven Vaar categories which are named after the weekdays, starting from 1 being Sunday and ending with 7 being Saturday. Of these 2,4,5,6,7 are acceptable, 1 and 3 are avoided (Sunday and Tuesday) because they indicate a strong tendency of incidents of fire in the property.