Arithmetic Sequence Calculator

Find the nth term and the sum of an arithmetic sequence.

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

First term

Common difference

Term number

How to use Arithmetic 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 + (n - 1)d.

Worked example

First term 3, difference 4: the 10th term is 39 and the sum of ten terms is 210.

Frequently asked questions

What is the nth term formula?

a_n = a_1 + (n - 1) x d.

What is the sum formula?

S_n = n / 2 x (2 a_1 + (n - 1) d).

Is the Arithmetic Sequence Calculator free?

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