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Fibonacci Generator

Generate Fibonacci numbers, their running total and the golden ratio between terms.

Generate a Fibonacci sequence

Last term: —
Ratio of the last two terms: —
Sum of the sequence: —
Terms stay exact up to F(78); the ratio approaches the golden ratio 1.618033988749895.

How to use the Fibonacci Generator

  1. Choose how many Fibonacci terms you need.
  2. Set the starting index to F(0) or F(1).
  3. Press Generate to list the sequence with its sum and ratio.

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Frequently Asked Questions

Common questions about the free online fibonacci generator.

Choose how many terms you need, set the starting index and press Generate to list the sequence with its running total.
Each term is the sum of the two before it. Starting from 0 and 1 the sequence runs 0, 1, 1, 2, 3, 5, 8, 13 and so on.
The ratio of consecutive Fibonacci terms approaches 1.6180339887, the golden ratio, and the panel shows the latest value.
JavaScript stores whole numbers exactly only up to about nine quadrillion, and Fibonacci terms pass that limit near F(79).
Yes. Switch the starting index to 1 if you want the sequence to begin 1, 1, 2, 3 instead of 0, 1, 1, 2.
They model rabbit populations, spiral leaf arrangements, pine cone scales and many other growth patterns in nature.
Yes. The panel adds every generated term and marks the total approximate once it grows beyond exact integer storage.
No. The whole sequence is built in your browser and nothing you type is sent to a server.

Last updated: October 10, 2026