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Online Tools and Calculators > Math > Exponential Decay Calculator

Exponential Decay Calculator

Fill in any three to calculate the fourth value:
Initial amount (P0):
Decay rate (r):
Time (t):
Final amount (P(t)):

About Exponential Decay Calculator

The Exponential Decay Calculator is used to solve exponential decay problems. It will calculate any one of the values from the other three in the exponential decay model equation.

Exponential Decay Formula

The following is the exponential decay formula:

P(t) = P0e-rt

where:
P(t) = the amount of some quantity at time t
P0 = initial amount at time t = 0
r = the decay rate
t = time (number of periods)

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