Shadbala is the classical measure of a planet's strength from six sources (position, direction, time, motion, natural strength and aspects) expressed in rupas against the minimum each planet needs. A planet at 1.0× or more is considered strong; below 0.75× it needs support.

Vimshopaka Bala is Parashara's second measure, scored out of 20 across the divisional charts. In each chart a planet earns points for the sign it occupies there (own sign or exaltation 20, a great friend's sign 18, a friend's 15, a neutral sign 10, an enemy's 7, a great enemy's 5), and the charts are weighted in four classical schemes: Shadvarga (6 charts), Saptavarga (7), Dashavarga (10) and Shodashavarga (16). A score above 15 is strong, below 10 weak. Tirth scores the Sun, Moon, Mars, Mercury, Jupiter, Venus and Saturn, as the text does.

Every tool uses the same chart and the same classical rules as your full Kundli report, so the results always agree with your reading.