Geometric Sequence Calculator

Find the nth term and sum of a geometric sequence.

Quick answer: Geometric Sequence Calculator: Find the nth term and sum of a geometric sequence. Everything runs in your browser, so nothing you enter is uploaded or stored.

First term

Common ratio

Term number

How to use Geometric Sequence Calculator

Enter your values in the fields.
The results update instantly as you type.
Note or copy the numbers you need.

Features

Instant results
Free, no signup
Runs in your browser, nothing is uploaded
Works on phone and desktop

Formula

a_n = a_1 x r^(n-1).

Worked example

First term 2, ratio 3: the 6th term is 486 and the sum is 728.

Frequently asked questions

What is the nth term formula?

a_n = a_1 x r^(n - 1).

What is the sum?

S_n = a_1 x (1 - r^n) / (1 - r).

Is the Geometric Sequence Calculator free?

Yes. It is free, needs no signup and works on any device.