Half-Life Calculator
Calculate how much of a substance remains after decay.
Result
Results are estimates for general information only and are not professional advice.
Half-life decay
Half-life is the time for a quantity to reduce to half its value. Using N = N₀ × (½)^(t/half-life), this calculator finds how much remains after a given time — useful in physics, chemistry and medicine.
Frequently Asked Questions
What is the Half-Life Calculator?
Calculate how much of a substance remains after decay. It runs instantly in your browser and is completely free.
Is the Half-Life Calculator free and does it require signup?
Yes. Every calculator on Calculatis is 100% free with no registration, and the values you enter are never stored.
How accurate is the Half-Life Calculator?
It uses standard, widely-accepted formulas. Results are reliable estimates for general use and are not a substitute for professional advice.