Fibonacci Number
Calculate an exact Fibonacci number with F₀=0 and F₁=1.
Your numbers
Fibonacci number
Use consistent units. The result follows the assumptions you enter.
Scenario comparison
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Formula
Fₙ = Fₙ₋₁ + Fₙ₋₂
Calculate an exact Fibonacci number with F₀=0 and F₁=1.
Worked example
- Index n
- 20
- Fibonacci number
- 6765
- Next number
- 10946
Scope and limitations
Use consistent units. The result follows the assumptions you enter.
Inputs are checked for missing values and allowed ranges. A result outside the finite numeric range is not displayed. Rounding affects display, while the calculation uses the model’s numeric precision.
Check your units and assumptions before relying on a result. Changing a label does not convert a currency or physical unit.
Formula version: 2302d55046eb · Example checked: