Half-Life Calculator

Calculate how much of a substance remains after a given time, based on its half-life, using the exponential decay formula.

Inputs
Results
Remaining Quantity
25 g

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Formula

N(t) = N₀ × (1/2)^(t / half-life)

Learn How This Works

Everyday Physical Science Calculations Explained

Density, half-life, and pH explained with the formulas and real-world examples like carbon dating.

How Half-Life and Carbon Dating Actually Work

The exponential decay formula behind radioactive half-life, explained with the carbon dating example.

Frequently Asked Questions

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