What number does the sequence start with?

The sequence starts with 0 and 1 (0, 1, 1, 2, 3, 5…).

Is precision kept for large terms?

Yes. BigInt is used, so even very large Fibonacci numbers are generated exactly.

Fibonacci Calculator

Enter how many terms you want and it instantly generates that many Fibonacci numbers from the start of the sequence.

Number of terms

Fibonacci sequence

0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89

About

In the Fibonacci sequence each number is the sum of the previous two (0, 1, 1, 2, 3, 5, 8…). This tool uses BigInt so even very large terms are exact — no rounding errors.

Calculation happens in your browser; your data is never sent out.

How to use

Enter the number of terms to generate (up to 1000).
The Fibonacci sequence is produced instantly.
Copy the result.

Frequently Asked Questions

What number does the sequence start with?: The sequence starts with 0 and 1 (0, 1, 1, 2, 3, 5…).
Is precision kept for large terms?: Yes. BigInt is used, so even very large Fibonacci numbers are generated exactly.

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