Ratio Calculator

Enter values in the three fields below, then calculate the desired ratio.

Select the ratio you use most

  • 16:9
  • 16:10
  • 4:3
  • 3:2
  • 21:9
  • 2:3

Notice

When you enter three values for A : B = C : D, the remaining ratio value will be calculated.

If all four values are entered, calculation will not be possible.

Ratio Calculator (a:b = c:Result) Concept and Applications

The ratio calculator is a method of calculating a value (result) that maintains the same ratio as two given values (a, b).
This concept is used in various fields such as mathematics, finance, design, and marketing.

1. Mathematical Ratio

A ratio is a method of calculating a new value while maintaining the relationship between two values.

Example: 2:3 = 4:X

X = (4 × 3) ÷ 2 = 6

Applications: Solving proportion problems, unit conversion

2. Financial and Investment Ratios

In finance, assets, liabilities, and returns are converted and analyzed using the same ratio.

Example: 1:5 = 10:X (Investment:Return)

X = (10 × 5) ÷ 1 = 50

Applications: Price-to-Earnings Ratio (PER), Debt Ratio, Currency Conversion

3. Design and Art Ratios

In design, ratios are used to maintain proportions like the golden ratio when composing a layout or artwork.

Example: 1:1.618 = 10:X (Golden Ratio)

X = (10 × 1.618) ÷ 1 = 16.18

Applications: Golden Ratio, Screen Ratios (16:9, 4:3), Design Principles

4. Business and Marketing Ratios

In marketing, ratios are used to calculate performance metrics such as click-through rates and conversion rates.

Example: 2:5 = 20:X (Clicks:Conversions)

X = (20 × 5) ÷ 2 = 50

Applications: Conversion Rate, Click-Through Rate (CTR), Customer Retention Rate (CRR)