Sequence Calculator
Arithmetic and geometric sequences — nth term and sum.
Term 10
48
Sum of first n
255
Common difference
5
First 5 terms
3, 8, 13, 18, 23
ShowHide the working
- 1aₙ = a₁ + (n−1)d = 3 + 9×5 = 48
- 2Sum = n/2 × (2a₁ + (n−1)d) = 255
Formula
arithmetic aₙ = a₁ + (n−1)d; geometric aₙ = a₁rⁿ⁻¹How it works
The nth term and running sum of an arithmetic or geometric sequence.
Example
The arithmetic sequence 3, 8, 13, … has a 10th term of 48 and sums to 255.
More in Math & Algebra
- Algebra Calculator
- Quadratic Equation Solver
- System of Equations Solver
- Graphing Calculator
- Matrix Calculator
- Vector Calculator
- GCD & LCM Calculator
- Prime Number Checker
- Factorial Calculator
- Permutation & Combination
- Logarithm Calculator
- Exponent Calculator
- Square Root Calculator
- Sequence Calculator
- Scientific Notation Converter
- Calculus Calculator
About the Sequence Calculator
Arithmetic and geometric sequences — nth term and sum. It sits in the Math & Algebra section of NWS Calc, a free collection of calculators that run entirely in your browser. There is no signup, no paywall and no tracking — open the page, enter your numbers, get an answer.
Frequently asked questions
- Is the Sequence Calculator free to use?
- Yes. Every calculator on NWS Calc is completely free, with no signup, no usage limits and no ads.
- Does my data leave my device?
- No. The Sequence Calculator runs entirely in your browser using JavaScript. Nothing you type is uploaded, logged or stored on a server.
- Can I use the Sequence Calculator on my phone?
- Yes. The page is fully responsive and works in any modern mobile or desktop browser — there is nothing to install.
- What else is in Math & Algebra?
- Equations, fractions, primes, roots, sequences and number theory. You can browse the full Math & Algebra category for related calculators.