# Arithmetic Series Online Calculator

Online calculator to calculate the sum of the first n terms and the nth term of an arithmetic sequence.

If A1, A2, ... , An, ... is an arithmetic sequence with common difference d, this calculator calculates the sum Sn given by

Sn = A1 + A2 + ... + An = (n/2)(A1 + An)
.

How to use the calculator

1 - Enter the first term A1 in the sequence, the common difference d and n the number of terms in the sum then press enter. An example is shown where a1 and d may entered as integers, decimals or fractions and n must be a positive integer.

 $A_1 =$ 2.1 , $d =$1/2 , $n=$10

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