Fossil Age Calculator

Estimate fossil or sample age using radiocarbon (C-14), potassium-argon (K-Ar), or custom half-life decay calculations.

Dating Method

C-14 Remaining (%)

Or: C-14/C-12 Ratio (x10^-12)

Estimated Age

years

Half-Lives Elapsed

Decay Constant

Parent Isotope Left

Daughter Product

Geological Period

Radiometric Dating Formulas

Age = -ln(N/N0) / lambda

lambda = ln(2) / half-life

C-14 half-life = 5,730 years

K-40 half-life = 1.248 billion years

Decay rates.

Isotope decay.

Calculate age.

Percentage math.

Earthquake scale.

Erosion rates.