Golden Ratio Crop Calculator

It compares your image's current width-to-height ratio against phi (≈1.618): if your image is wider than that ratio, it keeps height fixed and trims width down to height × phi, and if it's narrower (taller) than golden, it keeps width fixed and trims height down to width ÷ phi. Either way, only the dimension that's 'excess' relative to phi gets reduced — the other stays exactly as you entered it.

The regular crop compares width-to-height against phi and generally produces a landscape-oriented result, while the portrait crop instead checks height-to-width against phi, so it targets a vertical-format output regardless of your original image's orientation. If you shot a landscape image but want a golden-ratio portrait crop for a print or story format, this is the output to use instead of the primary crop dimensions.

The rule of thirds grid places lines at exactly 1/3 and 2/3 of each dimension, evenly dividing the frame into equal thirds. The phi grid instead places lines at 1/phi and 1 − 1/phi of each dimension — roughly 38.2% and 61.8% — which sit closer to the edges of the frame than thirds lines do, giving a slightly different set of intersection points to align a subject against.

Not exactly — this calculator places it at the intersection of the phi grid's vertical and horizontal lines, which is a common and convenient approximation, but a true logarithmic golden spiral's origin point involves a more complex recursive construction than a single grid intersection. Treat the reported focal point as a practical compositional reference rather than a mathematically exact spiral origin.