Radioactive dating age calculator
The Radioactive dating age calculator computes radioactive dating age from the relation t = (t_half/ln2) ln(N0/N). It takes 3 inputs (half-life in yr, initial amount, remaining amount) and returns the age in yr. Because this is a pure mathematical or physical formula rather than a jurisdiction-specific rule, the result never changes over time: the same inputs always produce the same answer, so you can rely on it whether you are checking homework, sizing a design, or sanity-checking another tool. Enter your values in the fields below and the result updates instantly; you can also share a permalink that pre-fills the exact calculation, which is useful for teaching, reports, or collaboration. For example, with half-life = 5730 yr, initial amount = 100, remaining amount = 50, the age works out to 5730 yr, and the worked example further down the page shows every step so you can follow the arithmetic and reproduce it by hand. The method is the standard form documented by NIST Chemistry WebBook, and the figure above each result carries the date it was last verified. This tool is general information and is not a substitute for professional engineering, medical, financial, or scientific advice; always check critical results against the primary source and your own judgement.
With Half-life = 5730 yr, Initial amount = 100, Remaining amount = 50, the result is 5730 yr.
Applies to: any numeric inputs. Method source: NIST Chemistry WebBook, checked 2026-06-22.
The formula
t = (t_half/ln2) ln(N0/N)
Worked example
With Half-life = 5730 yr, Initial amount = 100, Remaining amount = 50:
- t = (t_half/ln2) ln(N0/N)
- Age = 5730 yr
This worked example is one of the automated golden-value tests this calculator must pass before it can publish.
What this assumes
- Inputs are real numbers in the units shown.
- The result is the exact value of t = (t_half/ln2) ln(N0/N); general information, not professional advice.
Frequently asked questions
What formula does this use?
t = (t_half/ln2) ln(N0/N), the standard form documented by NIST Chemistry WebBook.
Does the result ever change over time?
No. This is a pure formula with no external rate, so the same inputs always give the same result.
Official sources and verification
- Method: NIST Chemistry WebBook, checked 2026-06-22.
Reviewed by the CalculatorHub team, edited by James Graham, 2026-06-22. See our methodology. General information, not professional advice.