An Online calculator to calculate the sum of the terms in a geometric sequence is presented.
If \( A_1, A_2, ... , A_n, ... \) is a geometric sequence with common ratio \( r \), this calculator calculates the sum Sn given by
\[ S_n = A_1 + A_2 + ... + A_n = a_1 \dfrac{1-r^n}{1-r} \]
and the nth term is given by \[ a_n = a_1 r^{n - 1} \]

Use of the Geometric Series calculator

1 - Enter the first term \( A_1 \) in the sequence, the common ratio \( r \) and \( n \) the number of terms in the sum then press enter. \( A_1 \) and \( r \) may be entered as integers, decimals or fractions. \( n \) must be a positive integer.