Arithmetic Sequence Calculator
The nth term and the sum of an arithmetic sequence.
Result
nth term
29.00
Sum of n terms
155.00
How it works
aₙ = a₁ + (n−1)d, Sₙ = n/2 (2a₁ + (n−1)d)
In an arithmetic sequence each term adds a fixed difference. The nth term and the running sum both follow simple formulas.
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Frequently asked questions
What is the common difference?
The fixed amount added between consecutive terms — positive, negative or zero.
How is the sum found?
Multiply the number of terms by the average of the first and last term.
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