Tools you might need next
Calculate depth of field from aperture, focal length, sensor size, and subject distance. See near and far focus limits for sharp photos.
Calculate correct exposure with the exposure triangle. Set ISO, aperture, and shutter speed for balanced photos in any lighting situation.
Convert focal length between camera sensor sizes using crop factor. Find full-frame equivalent focal length for APS-C, MFT, and more.
A golden rectangle has sides in ratio 1:1.618. Given one dimension, multiply or divide by φ to find the other for a phi-proportioned crop.
Long side = short side × 1.618; short side = long side / 1.618Recursive golden rectangles produce spiral anchor points. These often sit near — but not identical to — rule-of-thirds intersections, giving compositional guides.
φ = (1 + √5) / 2 ≈ 1.6180339887Starting from image width and height, the calculator finds the largest inscribed golden rectangle or centered crop, reporting pixel coordinates for editing software.
Crop height = width / φ (landscape) or crop width = height / φ (portrait)Updated: July 2026
From 4000 × 3000 pixels, a 1:1.618 landscape crop yields roughly 4000 × 2472 px — a cinematic proportion for portfolio posts.
Place the subject's eye near the upper golden spiral intersection to draw viewer attention naturally through the frame.
For an 11-inch short side, the long side at φ is about 17.8 inches — order custom mats or frames to match.
Composition serves the story. If a square or panoramic crop fits the subject better, use it — phi is a guide, not a rule.
The Fibonacci spiral approximates φ. For cropping, use exact 1.618 proportions; spiral overlays are approximate visual guides in editing apps.
The golden ratio (φ ≈ 1.618) appears in art and nature as a proportion many viewers find pleasing. This calculator computes crop dimensions and overlay positions so you can frame subjects along golden-ratio lines and rectangles.