In math, two quantities are in the golden ratio if their ratio is the same as the ratio of their sum to the larger of the two quantities .i.e (A+B)/A = (A/B) = φ = 1.61803398875...

This calculator can be used to find the quantities instantly by knowing any one either A or B or even A+B

The golden ratio is also know by other names like the golden mean or golden section. Other uncommon names include extreme and mean ratio, medial section, divine proportion, divine section, golden proportion, golden cut, and golden number.