Arithmetic Progression Calculator

Enter the first term, the common difference and the number of terms to find the nth term and the sum of an arithmetic progression, with the working shown.

First term a

Common diff d

Terms n

nth term and sum

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How it works

nth term aₙ = a + (n-1)d. Sum Sₙ = n/2 [2a + (n-1)d].

Frequently Asked Questions

What is the common difference?

It is the fixed amount added to each term to get the next term, for example 3 in 2, 5, 8, 11.