Fossil Age Estimator Calculator
Age range from stratigraphic layer and index fossils.
Inputs
Results
Radiometric age (years)
5,730
Stratigraphic age (years)1,000,000
Parent remaining (%)50
Half-lives elapsed1
D/P ratio1
Geologic era code0
How to Use This Calculator
- Select the Dating system: 0 for Carbon-14 (up to ~50,000 yr), 1 for K-Ar (millions of years), 2 for U-Pb or 3 for Rb-Sr (billions of years).
- Enter the measured Parent isotope amount and Daughter isotope amount in consistent relative units (e.g., ppm or counts).
- Set Sediment depth (m) and Sedimentation rate (m/kyr) for an independent stratigraphic age cross-check.
- Compare the Radiometric age and Stratigraphic age outputs — agreement between methods increases confidence.
- The Geologic era code and Percent parent remaining help place the sample in its geologic context.
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