Longevity (Ayurdaya) Calculator
A free reference tool that lays out how the classical Vedic texts compute an ayus (life-span) estimate — showing the workings of each method, not a prediction.
Ayurdaya (ayus = life-span) is the classical Vedic framework for computing a longevity estimate from a birth chart. It is not one formula but a family of methods, and the texts — Brihat Parashara Hora Shastra chief among them — set out rules for which one to apply. Jagannatha Hora presents this as a scholarly reference tool: it shows how each method derives its figure from planetary positions and strengths, for an astrologer to study. It computes the classical method; it does not issue a verdict about any person.
Classical authors also group life-span into three broad bands — alpayu (short), madhyayu (middle) and purnayu (full) — and describe corrections that can move a chart between them. This calculator follows the same computational steps the texts lay down, showing Pindayu, Nisargayu and Amsayu side by side so the derivation is visible. Longevity in the tradition is read together with the eighth (Randhra) house and dasha timing, and those factors are surfaced here for context — always as workings to weigh, never as a forecast.
The three Ayurdaya methods
Classical texts describe three ways to compute an ayus estimate, each drawing on the chart differently. This calculator shows all three workings side by side for reference — it demonstrates the method, not an outcome for anyone.
| # | Method | How it computes the estimate |
|---|---|---|
| 1 | Pindayu | Sums the year-contributions assigned to each planet, scaled by its strength between exaltation and debilitation (a rule-of-three from the deep exaltation point). |
| 2 | Nisargayu | Starts from the fixed natural year-values the texts allot to each planet, then applies the same strength-based reductions. |
| 3 | Amsayu | Derives each contribution from the navamsa (amsa) position, with the classical exaltation and placement corrections applied. |
| Which method a chart uses | the stronger of Lagna, Sun or Moon decides | |
Per Brihat Parashara Hora Shastra, whichever of the Lagna, the Sun or the Moon is strongest selects Amsayu, Pindayu or Nisargayu respectively; where two are equal, the texts average their results. Jupiter and Saturn can raise or lower the class. These are method workings for an astrologer to weigh — never a forecast of anyone's life-span.
All three ayus methods
Pindayu, Nisargayu and Amsayu computed side by side, each with the strength-based reductions the classical texts prescribe.
The classical bands
See how the workings sit against the traditional alpayu, madhyayu and purnayu bands, including the Jupiter and Saturn class-corrections.
Read in full context
Longevity is studied alongside the Randhra (8th) house, its lord and the dasha sequence — the calculator surfaces all of them for reference.
Common questions
What is Ayurdaya?
Ayurdaya (from ayus, life-span) is the classical Vedic method for computing a longevity estimate from a birth chart. The texts describe several computational schools and rules for choosing between them; it is a reference calculation for astrologers to study, not a verdict.
What are Pindayu, Nisargayu and Amsayu?
They are the three principal ayus methods. Pindayu works from planetary year-contributions scaled by strength, Nisargayu from the fixed natural year-values, and Amsayu from navamsa positions. Each is a different way of computing the same kind of estimate.
Which house shows longevity in the classical method?
The texts read longevity chiefly from the eighth (Randhra) house and its lord, alongside the Lagna and planets such as Saturn. The calculator surfaces these factors so the workings can be examined in context.
Does this calculator predict how long someone will live?
No. It presents the classical computations — the three methods and the traditional short, middle and full bands — for astrologer reference only. It shows how the texts derive an estimate; it does not forecast a lifespan, an age, or any timing.