// multi-utility computation suite · offline · instant · precise
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sci.radioactive-dating-decay Calculator
Calculates radiometric age from parent-daughter nuclide ratios: t = (1/λ) × ln(1 + D/P), where D is daughter atoms and P is parent atoms. U-Pb dating of zircons (t½ ²³⁸U = 4.47 Gyr) is accurate to ±0.1% — oldest dated minerals are Jack Hills zircons at 4.4 billion years.
Inputs
N Ratio
Reference formula or conversion factor shown for context.
T Half Ma
Reference formula or conversion factor shown for context.
Initial Ratio
Reference formula or conversion factor shown for context.
Results
calculated age (Ma)
The value at the specified point or condition.
decay constant λ (1/Ma)
Sample size or count used in the calculation.
age (years)
Reference formula or conversion factor shown for context.
t = (1/λ)·ln(1 + Nd/Np)
Sample size or count used in the calculation.
system
Reference formula or conversion factor shown for context.