×
EVEN THE mini TOOLS CAN EMPOWER PEOPLE TO DO GREAT THINGS.

Half Life Calculator

Fill in any three to calculate the fourth value.
Quantity remains N(t):
Initial quantity N0:
Time t:
Half-life t1/2:
Result
Quantity remains N(t) 0.717936471873
Initial quantity N0 5
Time t 168
Half-life t1/2 60

   

About Half Life Calculator

The Half-Life Calculator is used to calculate the half-life in exponential decay.

FAQ

Half-life is the period of time it takes for a substance undergoing decay to decrease by half. It is usually used to describe quantities undergoing exponential decay (for example, radioactive decay) where the half-life is constant over the whole life of the decay, and is a characteristic unit (a natural unit of scale) for the exponential decay equation. However, a half-life can also be defined for non-exponential decay processes, although in these cases the half-life varies throughout the decay process.

The calculation of half-life used in this tool is based on the exponential decay equation.

An exponential decay process can be described by the following formula:

Exponential Decay Formula

where:
N(t) = the quantity that still remains and has not yet decayed after a time t
N0 = the initial quantity of the substance that will decay
t1/2 = the half-life of the decaying quantity

Related

×

Do us a favor and answer 3 quick questions

Thank you for participating in our survey. Your input will help us to improve our services.

Where exactly did you first hear about us?

What is your favorite tool on our site?

if Other, please specify:

How likely is it that you would recommend this tool to a friend?

NOT AT ALL LIKELYEXTREMELY LIKELY

Likely score: (1-10)