Arithmetic Sequence Calculator

Welcome to the most comprehensive online Arithmetic Sequence Calculator. In fact, we offer two arithmetic sequence calculators in one! Choose the first calculator if you have the first number and the common difference of a sequence. Choose the second calculator if you have the first three numbers of a sequence.

The first calculator below is appropriate when you have the first number and the common difference of a sequence, and you want to see the beginning of the sequence, the nth term (number) in the sequence, and the sum of all numbers up through the nth number in the sequence.

Note that you can enter positive or negative whole numbers (integers). Futhermore, we use the words "terms" and "numbers" interchangeably on this page.

With our second calculator below, you can enter the first three numbers (terms) of a sequence. We will determine if it is an arithmetic sequence and provide further information about it.

Here are some examples of arithmetic sequences that you may find interesting.

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