Aaya (Income) Calculation — Perimeter×8÷12
The Aaya calculation is the income/gain component of the Ayadi Shadvarga system.
Local term: आय गणना — परिधि×8÷12 (Āya Gaṇanā — Paridhi×8÷12)
Modern Vastu practice recognises the Aaya calculation as a proportional constraint system — by forcing the perimeter to yield specific modular remainders, the formula effectively selects from a family of dimensional ratios that centuries of empirical construction have validated. Contemporary architects apply the calculation using metric-to-Hasta conversion tables, and some Vastu software tools automate the entire process, flagging perimeters that yield malefic-sign remainders and suggesting Angula-level adjustments.
Source: Contemporary Vastu compilations; Architectural proportion theory; Modern Vastu Ganita software manuals
Unique: Modern Vastu software automates the Aaya calculation — the architect enters external dimensions in metres, the tool converts to Hasta, computes the perimeter x 8 / 12 remainder, and maps it to the zodiac. Some firms include the Aaya Rashi in a printed Vastu Certificate as proof of numerological compliance, making the ancient calculation accessible to clients unfamiliar with traditional mathematics.
The Rule in Modern Vastu
Ideal
Apply the Aaya calculation (perimeter in Hasta x 8 / 12) to the building's external perimeter using metric-to-Hasta conversion, verifying that the remainder maps to a fire sign (Aries=1, Leo=5, Sagittarius=9) for maximum prosperity alignment.
Acceptable
Simplified Aaya check using approximate metric conversion is acceptable as a minimum modern standard — the critical requirement is that the remainder avoids malefic signs (Scorpio=8, Capricorn=10).
Prohibited
Ignoring the Aaya calculation entirely when it can be automated at zero cost is considered professional negligence in modern Vastu practice — the income-number is too commercially significant to leave to chance.
Sub-Rules
- Aaya calculation (perimeter x 8 / 12) has been performed and the remainder documented before construction▲ Major
- Aaya remainder falls on a fire sign (Aries=1, Leo=5, Sagittarius=9) — the most auspicious income indicators▲ Major
- Aaya remainder falls on a malefic sign (Scorpio=8, Capricorn=10) or Aaya is less than Vyaya — inauspicious income configuration▼ Major
- No Aaya calculation was performed — the building's income-gain numerological status is unknown▼ Minor
The Aaya calculation is the income/gain component of the Ayadi Shadvarga system. By multiplying the building's external perimeter (in Hastas) by 8 and dividing by 12, the Sthapati determines which zodiac sign governs the dwelling's prosperity potential. Fire signs (Aries, Leo, Sagittarius) indicate the strongest income attraction, while malefic signs indicate financial stagnation. This is the single most important numerological check for wealth-oriented construction.
Common Violations
Aaya remainder maps to a malefic zodiac sign (Scorpio=8 or Capricorn=10) — income energy is blocked
Traditional consequence: The building's perimeter generates a gain-number aligned with zodiac signs associated with obstruction and loss. Classical texts describe such a dwelling as one where Lakshmi turns her face away — income opportunities arise but fail to materialise, and financial growth stagnates despite the occupant's efforts.
No Aaya calculation was performed — the building's income-gain numerological status is unknown
Traditional consequence: Without the Aaya reckoning, the building's dimensional relationship to the zodiac cycle of prosperity is left to chance. The Sthapati has no way to verify whether the perimeter favours gain or loss, and the structure may inadvertently carry a malefic Aaya remainder that silently undermines the occupant's financial wellbeing.
How Other Traditions Compare
Relative to Modern Vastu
The Varanasi Sthapati guilds maintained handwritten Aaya-phala (income-result) tables listing the twelve zodiac remainders with specific wealth predictions for each. Rajasthani Silawat masons inscribed the Aaya Rashi on the foundation stone — surviving inscriptions on Jaisalmer Havelis confirm fire-sign remainders, suggesting that dimensions were adjusted until the Aaya yielded Mesha, Simha, or Dhanus.
Peshwa-era Wadas in Pune's Kasba Peth show physical evidence of plinth micro-adjustments — the outer wall jogs inward by 2-3 cm at specific points, consistent with Aaya remainder correction. The Sutradhar guild of Satara maintained Aaya-phala tables calibrated to the Marathi Hasta, with fire-sign remainders marked in red ink as 'Shubha' (auspicious).
Tamil Sthapatis of the Vishwakarma community in Kumbakonam maintain palm-leaf Ganita-grantha with Aaya-phala tables computed to 1/8th Angula precision — the finest resolution in any Indian tradition. The Kamikagama uniquely prescribes different Aaya acceptability thresholds for temple versus residential construction: temples require fire signs exclusively, while dwellings may accept Rishaba (Taurus=2) or Kanni (Virgo=6).
Kakatiya guild record stones at Warangal's Thousand-Pillar Temple preserve Aaya remainder values carved in Telugu numerals — the oldest surviving physical evidence of the income calculation. Telugu Sthapatis use the Kishku-Hasta (24 Angulas) as the base unit, and the Aaya is called Dhana-Lekka (wealth-number) in the Kakatiya builder vocabulary, reflecting its commercial primacy.
Jain Basadis at Mudabidri contain inscribed Aaya remainder values in Halegannada numerals on pillar bases — the Sthapati recorded the fire-sign result as a permanent mathematical certificate of prosperity. Hoysala temple plinths at Belur and Halebidu show systematic 1-2 Angula offsets consistent with Aaya perimeter corrections to achieve Mesha (Aries) or Simha (Leo) remainders.
The Perumthachan lineage maintained handwritten Ganita-grantha with Aaya-phala tables calibrated to Kerala's Kishku-Kol measuring rod, listing prosperity predictions for each of the twelve zodiac remainders. The Manushyalaya Chandrika uniquely prescribes a verbal contract: the Thachan announces the Aaya Rashi, and the householder must say 'Shubham' (auspicious) before construction may proceed — a verbal acceptance of the income-number.
Solanki-era Havelis in Patan contain Aaya remainder values inscribed in Gujarati numerals on the courtyard foundation stone — fire-sign results are marked with a Swastika symbol as a prosperity seal. The Jain Sthapati tradition treats the Aaya as a Dhana-sankhya (wealth-number) and considers a fire-sign result a prerequisite for the Vastupujana ceremony.
Bengali Sutradhar guilds of Nabadwip maintained Aaya-phala tables calibrated to the Bengali Hasta (23 Angulas — shorter than the Kashi standard of 26), with fire-sign results marked in sindoor (vermillion) ink. The Ganaka announces the Aaya Rashi during Bhoomi Puja while the Purohit performs parallel Lakshmi-Mantra recitation — a dual mathematical-ritual prosperity invocation unique to Bengal.
The Jagannath Temple at Puri is traditionally cited as possessing the ideal Aaya — its external perimeter yields a fire-sign remainder, making it the supreme exemplar of income-attracting proportions. Kalinga Sthapatis use the Kishku-Mana (Odia measuring rod) as the base unit and call the Aaya the Dhana-ganita (wealth-calculation), reflecting its primacy in Odia commercial construction.
Punjabi Raj-Mistri guilds maintained Ganit-pothi with Aaya-phala tables calibrated to the Punjabi Gaz (yard measure, approximately 33 inches). The Sikh building tradition treats precise Aaya calculation as a form of Seva (service) — the Raj-Mistri serves the householder by ensuring that the building's income-number reflects Hukam. Golden Temple renovation records historically included Aaya verification.
Terms in Modern Vastu
Universal:
Remedies & Solutions
Automated Aaya calculation via Vastu software with metric-to-Hasta conversion — modern standard
Modern VastuPrinted Vastu Certificate including Aaya Rashi as part of compliance documentation
Modern VastuPerform the Aaya calculation (perimeter x 8 / 12) on the building's external perimeter. If the remainder maps to a malefic sign, adjust the outer plinth dimension by 1-2 Angulas (2-4 cm) to shift the remainder to a fire sign (1, 5, or 9).
If physical dimension adjustment is not feasible, perform a Guru (Jupiter) Graha Shanti Homa — a fire ritual specifically prescribed for strengthening the Aaya (income) energy of an existing structure whose remainder is inauspicious.
Consult a qualified Sthapati (traditional architect) for precise Aaya calculation using regional Hasta/Angula standards and zodiac remainder tables specific to the local tradition.
Remedies from other traditions
Foundation stone inscription of Aaya Rashi and remainder value — Varanasi Sthapati tradition
Vedic VastuGuru Graha Shanti Homa if Aaya remainder is inauspicious post-construction
Plinth micro-adjustment at outer wall to shift Aaya remainder — Maharashtrian Sutradhar technique
HemadpanthiLakshmi Puja at the main entrance if Aaya correction is performed post-construction
Classical Sources
“Let the Sthapati take the outer measure of the griha in Hasta and multiply by eight, then divide by twelve — the remainder reveals the Rashi of gain. If Mesha, Simha, or Dhanus be the result, the dwelling shall attract wealth as a lotus attracts bees; if Vrischika or Makara, the master shall know only loss.”
“The Aaya is the first among the six sacred reckonings — for what profit is a dwelling that repels prosperity? Multiply the bahya-paridhi by eight parts and divide by the twelve houses of the sky; the remainder is the Rashi of gain, and upon its nature hangs the fortune of all who dwell within.”
“Of the six measures that govern a dwelling's fate, the first to be reckoned is Aaya — the gain-number. The perimeter, taken in Kishku-Hasta, is to be eightfold multiplied and twelvefold divided; the residue declares whether Lakshmi shall enter or turn her face from the threshold.”
“Vishvakarma instructed: before the foundation trench is cut, let the architect reckon the gain-number from the outer girth of the structure — for a house whose Aaya falls upon an auspicious Rashi is as a vessel filled from above, but one whose remainder is ill-starred is as a pot cracked at the base, retaining nothing however much is poured.”
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