โ Math
Number Sequence Calculator
An arithmetic sequence adds the same difference at every step, while a geometric sequence multiplies by the same ratio. Recognising which one you are looking at is the key to predicting the next terms.
How it works
First term
Common difference or ratio
Term number (n)
Sequence type
Nth term
Sum of first n terms
Next term
Average of the series
Frequently asked questions
How do I use the Number Sequence Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.