Golden Spiral Calculator — Fibonacci Spiral Overlay
Calculate golden spiral overlay dimensions and focal point for your image frame.
Width in pixels
Height in pixels
How We Calculate This
The golden spiral is constructed from successive golden rectangles:
Spiral Construction
A golden rectangle (aspect ratio φ:1) is divided into a square and a smaller golden rectangle. This process repeats, creating successively smaller squares. Quarter-circle arcs through each square form the golden spiral.
Focal Point
Focal X = width / φ ≈ 61.8% from left
Focal Y = height / φ ≈ 61.8% from top
Each quarter turn, the spiral radius decreases by a factor of 1/φ, converging on the focal point.
Frequently Asked Questions
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Last updated: February 2026
All calculations are estimates based on standard optical and photographic formulas. Results may vary with specific equipment.