About the Arithmetic Sequence Calculator
Find the nth term and the sum of an arithmetic sequence. This tool is free, works in your browser and needs no sign-up.
How to use the Arithmetic Sequence Calculator
Enter the first term, the common difference and the number of terms.
Formula used
nth term = a1 + (n − 1) × d. Sum = n ÷ 2 × (2 × a1 + (n − 1) × d).
Example
With First term 2, Common difference 3, Number of terms 10, the calculator shows: nth term = 29; Sum of terms = 155.
Frequently asked questions
Is the Arithmetic Sequence Calculator free to use?
Yes. It is completely free and you can use it as many times as you like.
How accurate is the Arithmetic Sequence Calculator?
The calculator uses standard formulas, so the maths is exact. Real life results can differ because of fees, taxes, rounding or personal factors, so treat the answer as an estimate.
Do you store the numbers I enter?
No. All calculations run in your browser. The values you type are not sent to our server.
Disclaimer: results are estimates for information only. They are not financial, medical or professional advice.