Ratio Calculator (Golden Ratio, Silver Ratio, etc.) / Tool

This tool calculates the golden ratio and the silver ratio. Enter one side, and the short and long sides will be calculated.

		Long side	Short/Long	Short side
Input
Silver ratio Yamato ratio	1.414	1.414	1	0.707
Golden ratio The first metallic ratio	1.618	1.618	1	0.618
Platinum ratio	1.732	1.732	1	0.577
Silver ratio The second metallic ratio	2.414	2.414	1	0.414
Bronze ratio The third metallic ratio	3.303	3.303	1	0.303

2020-04-04

How to use this tool

When a numerical value is entered, the “long side with the input value as the short side” and “short side with the input value as the long side” are automatically calculated.
Calculation results are rounded to the fourth decimal place.

Name	Approximate value of ratio	Summary
Silver ratio	`1:1.414`	Non-metallic ratio. Used for paper dimensions, etc. It is popular in Japan and is also called Yamato ratio.
Golden ratio	`1:1.618`	The first metallic ratio.
Platinum ratio	`1:1.732`	Non-metallic ratio. Equal to the ratio of half the length of the base of an equilateral triangle to the height of the equilateral triangle.
Silver ratio	`1:2.414`	The second metallic ratio.
Bronze ratio	`1:3.303`	The third metallic ratio.

What is the metallic ratio?

The metallic ratio is a ratio for which the following equation holds true and is considered to give a sense of stability and beauty.

1:{\dfrac {n+{\sqrt {n^{2}+4}}}{2}}

Golden Ratio

The golden ratio is the following ratio.

1:{\dfrac {1+{\sqrt {5}}}{2}}

Approximate value is 1:1.618, approximately 5:8 or 8:13.

${\dfrac {1+{\sqrt {5}}}{2}}$ is called the golden number and is represented by the Greek letter φ (phi).

φ={\dfrac {1+{\sqrt {5}}}{2}}=1.6180339877...

The golden ratio has long been used in buildings and works of art as a stable and beautiful ratio. Approximations also frequently appear in nature.

Artifacts: Parthenon, Mona Lisa, Thirty-six Views of Mt. Fuji, Apple’s logo, etc.
Nature: Nautilus shell spiral, sunflower seed spiral, typhoon and nebula vortex, etc.

Example of Golden Ratio Calculation

e.g. Calculate the short side when the long side is 100

Short side ＝ 100 ÷ ${\dfrac {1+{\sqrt {5}}}{2}}\approx$ 61.803

e.g. Calculate the long side when the short side is 100

Long side ＝ 100 × ${\dfrac {1+{\sqrt {5}}}{2}}\approx$ 161.803

The shape of the tool is a rectangle with the golden ratio of sides (golden rectangle). If the largest square is excluded from this golden rectangle, the remaining rectangle will again be in the ratio of the golden rectangle, thus creating a shape that is forever similar.

Silver Ratio

There are two types of silver ratios.

1. One of the precious metal ratios

{\textstyle 1:1+{\sqrt {2}}}

Approximate value is 1:2.414.

2. Yamato ratio

{\textstyle 1:{\sqrt {2}}}

Due to its $1:{\sqrt {2}}{}\equiv {}{\sqrt {2}}:2$ nature, it is used for paper dimensions, etc.

For some reason, Japanese people prefer the silver ratio (Yamato ratio) to the golden ratio, which has been used in buildings for a long time.
e.g. Horyu-ji and Five-storied Pagoda, Choju-Giga, Tokyo Sky Tree, Doraemon, etc.

Example of Silver Ratio Calculation

e.g. Calculate the short side when the long side is 100

Short side ＝ 100 ÷ ${\sqrt {2}}\approx$ 70.711

e.g. Calculate the long side when the short side is 100

Long side ＝ 100 × ${\sqrt {2}}\approx$ 141.421

The shape of this tool is a rectangle whose sides are all bisected by a silver ratio. This is the standard for paper such as A- and B-format.