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Half-Life Calculator

Track how radioactive samples decay over time

Time Elapsed

0.00 units

Remaining Amount

100.00 units

Half-Lives Passed

0.00

Activity

6.93 /unit time

Adjust time with the slider below

Initial Amount (N₀)

Half-Life (T½)

Time Elapsed (t)

Calculation

Formula:

N (t) = N_{0} \cdot (\frac{1}{2})^{t / T_{1/2}}

Substitute:

N(0) = 100 · (0.5)^(0/10)

= 100 · (0.5)^(0.00)

Result:100.00