Arithmetic Sequence Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the first term, common difference and term number.
- Press Calculate.
How it works
Each term adds a fixed difference. The nth term = first + (n − 1) × difference; the sum = n ÷ 2 × (first + last).
Worked example
2, 5, 8… (n=5). 5th term 14, sum 40.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.