Half-Life Calculator
Calculate the remaining quantity of a radioactive substance after any number of half-lives, or find the half-life from decay data.
Half-Life Calculator
How to Use the Half-Life Calculator
The Half-Life Calculator makes it easy to get accurate results in seconds. Simply enter your values in the fields above and the result updates automatically. All calculations use industry-standard formulas.
Calculate the remaining quantity of a radioactive substance after any number of half-lives, or find the half-life from decay data.
Results are for informational and educational purposes only. For financial decisions, consult a qualified financial advisor. For health matters, consult a licensed healthcare provider.
Frequently Asked Questions
Half-life is the time it takes for half of a radioactive substance to decay. After 1 half-life: 50% remains. After 2: 25%. After 10: ~0.1%.
Related Calculators
Exponent Calculator
Calculate any base raised to any power, including negative and fractional exponents.
Log Calculator
Calculate logarithms in any base — log, ln, log2, and more.
Scientific Calculator
Full-featured scientific calculator with trig, log, and powers.