Nth term and sum for arithmetic/geometric.. Sequence Calculator is a free online tool from the ToolsRift Math Calculators collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.
Choose arithmetic or geometric, enter the first term, the difference or ratio and n, and get the nth term and sum.
Arithmetic sequences add a constant difference each term; geometric sequences multiply by a constant ratio.
Arithmetic: aₙ = a₁ + (n−1)d; geometric: aₙ = a₁ × r^(n−1), using the first term and the common difference or ratio.
Yes — it returns the sum of the first n terms using the appropriate arithmetic or geometric sum formula.