Half-life is the time for half a substance to decay. If a 100 g sample has a 10-year half-life, 50 g remains after 10 years and 25 g after 20 years.
Half-life is the time for half a substance to decay. If a 100 g sample has a 10-year half-life, 50 g remains after 10 years and 25 g after 20 years. Our half life calculator is built on the same core half life formula radioactive decay calculator decay constant calculator and is trusted by students, professionals and everyday users who need a fast, accurate result. Because every calculation runs locally in your browser, there is no waiting, no sign-up and no limit on how often you use it.
The Exponential Decay Formula: N(t) = N₀ × (½)^(t / t₁/₂)
N(t) is the remaining quantity after time t, N₀ is initial quantity, and t₁/₂ is the substance half-life duration.
Carbon-14 Dating & Nuclear Medicine
Carbon-14 (half-life 5,730 years) is used by archaeologists to date ancient organic artifacts. Medical radioisotopes (e.g. Technetium-99m) diagnose organ health.
Pharmacological Drug Half-Life
In pharmacology, drug half-life determines how frequently medications must be dosed to maintain therapeutic blood plasma levels.
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