basic

Half-Life Calculator

Remaining quantity after a given time.

Compute the remaining quantity of a decaying substance after any number of half-lives.

Daniel Oh By Daniel Oh
Reviewed by Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

units of time
units of time

Results

Enter values and click Calculate to see results.
Was this helpful?

How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

N(t) = N₀ · (1/2)t / T½

In depth

Compute the remaining quantity of a decaying substance after any number of half-lives.