The half-life calculator results are accurate to the 16-th decimal and are usable in physics, chemistry, etc. Months are approximated to 30.5 days, years are approximated to 365.2421 days. Supported units are nanoseconds, milliseconds, seconds, minutes, hours, days, weeks, months, and years. Our versatile radioactive decay calculator supports many different time units and automatically converts them if the time unit you measure the time elapsed is different than the time unit you enter the half-time, decay constant or mean lifetime in. Calculate the remaining quantity of a radioactively decaying element given its initial quantity, its half-life (or decay constant, or mean lifetime), and the time it was decaying for.Calculate the initial quantity of a radioactive element, given its current quantity, its half-life (or decay constant, or mean lifetime) and the time it was decaying for.Calculate the half-life, decay constant and mean lifetime of an element if you have a sample for which you know the initial amount, the current amount, and the time passed between the two measurements.Time a sample if you know the current amount of radioactive matter in it, it's base (expected) amount and the half-life, decay constant or mean lifetime of the element you are measuring.Using the above multipurpose radioactive decay calculator you can: Half-Life, Decay Constant, and Mean Lifetime.
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