Number Sequence Calculator
Find the nth term and sum of an arithmetic sequence.
Result
Results are estimates for general information only and are not professional advice.
Arithmetic sequences
In an arithmetic sequence each term increases by a fixed amount d. The nth term is a₁ + (n−1)d and the sum of the first n terms is n/2 × (2a₁ + (n−1)d). This calculator computes both.
Frequently Asked Questions
What is the Number Sequence Calculator?
Find the nth term and sum of an arithmetic sequence. It runs instantly in your browser and is completely free to use.
What do I need to enter to use the Number Sequence Calculator?
The Number Sequence Calculator asks for the following values (3): First term (a₁), Common difference (d), Term number (n). Fill them in and the result appears immediately — the calculation runs on your own device, so nothing you type is sent to a server.
How accurate is the Number Sequence Calculator?
The Number Sequence Calculator uses standard, widely-accepted formulas, so its figures are reliable estimates for everyday planning. They are not a substitute for advice from a qualified professional.
Is the Number Sequence Calculator free, and do I need an account?
Yes. The Number Sequence Calculator — and every other calculator on Calculatis — is completely free, with no registration, no download and no limit on how often you use it.