Fibonacci Number
MATHEMATICS
Fibonacci Number
Calculate an exact Fibonacci number.
UNDERSTAND YOUR RESULT
How it works
Calculate an exact Fibonacci number.
THE CALCULATIONF₀=0, F₁=1; Fₙ=Fₙ₋₁+Fₙ₋₂
Using this calculator
Enter index n (f0 = 0). F₀=0, F₁=1; Fₙ=Fₙ₋₁+Fₙ₋₂.
What to keep in mind
Finite real numbers unless a complex or exact-integer result is specified. Outputs are rounded for display. Matrix calculations use floating-point arithmetic.
Frequently asked questions
Are my entries saved?
No. Calculator inputs remain in the current page and are cleared when you reload or leave. The tools do not upload your entries.
Why are results rounded?
The display is rounded for readability. Calculations use unrounded intermediate values. An estimate should not be interpreted as an exact measurement.