# Rate of decay calculator

Use this decay calculator to easily calculate the time elapsed since the beginning of the decay, or calculate the original quantity, half-life (a.k.a. decay rate) or remaining quantity of a substance

## Free Online Radioactive Isotopes Decay Calculator

Exponential growth/decay formula x ( t) = x0 × (1 + r) t x (t) is the value at time t. x0 is the initial value at time t=0. r is the growth rate when r>0 or decay rate when r<0, in percent. t is the time

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## Exponential Growth Calculator

Exponential Decay Calculator - Solve exponential decay problems. Decay rate (r): Time (t): Final amount (P(t)): About Exponential Decay Calculator . The Exponential Decay Calculator is used