Golden Ratio Calculator
Calculate golden ratio proportions and dimensions from a given length or width using this free phi calculator right in your browser.
Enter Values
Minimum 0
How to use this calculator
- Enter a known length.
- Read the longer (×φ) and shorter (÷φ) parts.
How it works
The golden ratio φ ≈ 1.618; multiplying or dividing by it gives the harmonious partner length.
Worked example
100. Longer 161.8, shorter 61.8.
Common mistakes
- Treating it as exact — φ is irrational, so results are rounded.
- Overusing it; good design isn't only proportions.
Frequently asked questions
What is the golden ratio?
Approximately 1.618 — divide a length by it, or multiply, to get proportions widely used in design, layout and typography.
How do designers use it?
Sizing headings against body text, setting column widths, or spacing elements so each part relates to the next by roughly 1.618.
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Cite this tool
Zerdly. (2026). Golden Ratio Calculator. Retrieved from https://www.zerdly.com/tools/golden-ratio-calculator/
Tip: Enter any known values to calculate the remaining results.
Designed to run locally in your browser. Tool inputs are not intentionally stored by Zerdly unless stated otherwise.