Arithmetic Sequence Calculator

An arithmetic sequence is a list of numbers where consecutive terms differ by a constant value called the common difference (d). Examples include: 2, 5, 8, 11

The calculator uses the standard published formula for arithmetic sequence. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: nth term: aₙ = a₁ + (n−1) × d. Each step in the calculation is shown so you can verify the result manually.