Geometric Series Online Calculator

Online calculator to calculate the sum of the terms in a geometric sequence.

If A1, A2, ... , An, ... is a geometric sequence with common ratio r, this calculator calculates the sum Sn given by

Sn = A1 + A2 + ... + An = a1(1-rn)/(1-r)

and the nth term an = a1 rn - 1

How to use the calculator

1 - Enter the first term A1 in the sequence, the common ratio r and n n the number of terms in the sum then press enter. A1 and r may be entered as an integer, a decimal or a fraction. n must be a positive integer.

 $A_1 =$ 2.1 , $r =$1/2 , $n=$10

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