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This free tool allows you to compute the final value after exponential growth or decay from an initial quantity, a signed percent rate per time unit, and elapsed time.
Initial value (x₀)
Quantity at time zero.
Rate of change (r)
Percent per one time unit below; negative for decay.
Elapsed time (t)
Elapsed time in the unit below (≥ 0).
Time unit
Same unit for both the rate and elapsed time.
Calculate
Reset
Enter x₀, r, and t, then click Calculate.
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