Half-Life Calculator
The Half-Life Calculator determines how much of a substance remains after a given time, based on its half-life — the time it takes for half the quantity to decay or be eliminated. Half-life applies to radioactive isotopes, medications in the body, environmental contaminants, and any exponential decay process.
Frequently Asked Questions
Half-life (t½) is the time required for exactly half of a substance to decay or be eliminated. After one half-life: 50% remains. After two: 25%. After three: 12.5%. It follows exponential decay.