Fibonacci Sequence Calculator
Generate the Fibonacci sequence up to any term, or jump straight to a specific term — exact values using arbitrary-precision arithmetic.
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F()—
Sequence
The Fibonacci Sequence, Exactly
Each term is the sum of the two before it (0, 1, 1, 2, 3, 5, 8, 13…). Enter how many terms you want listed, or ask directly for the Nth term. Values are computed with JavaScript's BigInt, so even very large terms (hundreds of digits) come out exact — no floating-point rounding.
Frequently Asked Questions
How large can N be?
Up to 1000 — well beyond where regular floating-point numbers would lose precision. BigInt keeps every digit exact.
Does the sequence start at 0 or 1?
This tool starts at F(0)=0, F(1)=1, matching the standard mathematical definition.
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Fibonacci Sequence Calculator