Why these calculators exist
Most Islamic finance questions need a scholar. A few need arithmetic — and those few are done badly almost everywhere. Inheritance shares get rounded until they no longer add to one. Zakat calculators hardcode a nisab that was accurate the month they were written. Neither shows you the rule it applied, so neither can be checked.
These pages take the opposite approach. Shares are kept as exact fractions, so two thirds plus a sixth plus a sixth is one and not 0.9999. The nisab is derived from a price you supply today. Every result names the rule it came from, every excluded heir names the relative who excluded them, and the working is on the page rather than hidden behind it.
What these calculators will not do
They will not give you a ruling. A calculator applies rules to the facts you type; it cannot see a disputed heir, an unborn child, a pension you cannot yet draw, or the question your own school answers differently. Every result here says so plainly rather than in small print, because an inheritance divided wrongly is not a mistake you get to take back.
They also will not take your data. Everything runs in your browser. Nothing you enter is sent anywhere, stored on a server, or logged — and the inheritance calculator does not even keep your entries in the browser, because who has died in a family is not a thing to leave sitting on a shared computer.