Fibonacci calculator
Choose how many terms to generate the Fibonacci sequence.
Fibonacci calculator
Generate the Fibonacci sequence up to any number of terms and see their sum. Calculations use big integers, so even large terms stay exact (no rounding). It all runs in your browser.
What is the Fibonacci sequence?
Each number is the sum of the two before it, starting 0, 1: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34… The ratio between consecutive terms approaches the golden ratio (≈1.618). It appears in nature, art and computer science.
Frequently asked questions
Does it start at 0 or 1? Here the sequence starts at 0, 1 (the most common convention).
How many terms can it handle? Up to 100 terms, computed exactly with big integers.