Enter the half-life into the calculator to determine the decay constant, also known as the decay rate.

## Decay Constant Formula

The following formula is used to calculate the decay constant.

λ = ln (2) / t_{1/2 }

- Where λ is the decay constant (s^-1)
- Where t
_{1/2}is the half-life (seconds)

## FAQ

**What is a decay constant?**

A decay constant is the proportionality between the total size of a number and the rate of decay. This is most often used in physics when analyzing elements that undergo radioactive decay.

## Decay Constant Example

How to calculate decay constant?

**First, determine the half life.**The half life is the total time it takes for the population or amount to diminish to 1/2 it’s original size.

**Next, calculate the decay constant.**Using the formula above, plug in the half life.

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