Capital Gain = Sale Consideration − (Cost of Acquisition + Cost of Improvement)
(If Indexed Cost is provided, it replaces Cost of Acquisition + Improvement)
Equity STCG (approx.) ≈ Gain × 15% (+ 4% cess)
Equity LTCG (approx.) ≈ max(0, Gain − ₹1,00,000) × 10% (+ 4% cess)
Other STCG (approx.) ≈ Gain × Slab Rate% (+ cess as part of rate)
Other LTCG (approx.) ≈ Gain × 20% (+ 4% cess), assuming indexation where permitted
Real-life capital gains computation may also involve grandfathering provisions, special rates for certain securities, basic exemption adjustment for some residents, exemption sections (54, 54F, 54EC, etc.) and set‑off of carried forward losses. This calculator focuses on the core percentage logic for a quick, high-level estimate.