Geometric sequence calculator( Sum and nth term)

First term of the sequence:
Common ratio:
Enter n:
an Sn

In mathematics, a geometric progression, is a sequence of numbers where each term after the first is found by multiplying the previous one by a fixed number(The fixed number is non-zero number), it is also known as a geometric sequence.

The sequence 1, 2, 4, 8, 16, ... is a geometric progression, the common ratio is 2. the common ration may be negative, the sequence will switchs from positive to negative and back, like the sequence 1, -2, 4, -8, ..., the common ration is -2.

Geometric progression Formula:

an = [a1 r (n-1)]

sn = (a1(1−rn))(1−r)

Where, a1 - first term, n - number of term, r - common difference. provides you helpful and handy calculator resources.