Golden ratio calculator
The golden ratio φ = (1 + √5) / 2 ≈ 1.618 appears throughout art, design, and nature. Two quantities a and b are in the golden ratio when (a + b) / a = a / b = φ.
Enter a length you already know, choose whether it is the longer or shorter segment, and the calculator returns the matching values — divide by φ to step down, multiply by φ to step up. Everything runs in your browser.