Ratio Calculator

Calculate

First Number (a)

Second Number (b)

Third Number (c)

Fourth Number (x)

Decimal Places

Results

Enter values and click calculate to see results

Understanding Ratios

Basic Concepts

Ratio compares two quantities
Written as a:b or a/b
Order matters (a:b ≠ b:a)
Both numbers must be non-zero

Proportions

Two equal ratios (a:b = c:d)
Cross multiply: ad = bc
Used to find missing values
Scale drawings and maps

Applications

Recipe scaling
Map scales
Financial ratios
Probability