Are these calculators really free?

Yes, all our calculators are completely free to use. No registration, no hidden fees, and no limitations on usage.

How accurate are the calculations?

Our calculators use standard mathematical formulas and are tested for accuracy. Results are precise and reliable for most practical applications.

Can I use these on mobile devices?

Absolutely! All our calculators are fully responsive and work perfectly on smartphones, tablets, and desktop computers.

Do you store my calculation data?

No, we don't store any of your input data. All calculations are performed locally in your browser for privacy and security.

How do you simplify a ratio?

Find the greatest common divisor of both values, then divide each side by that number.

How do I convert ratio to percentage?

For ratio a:b, use a/(a+b)*100 and b/(a+b)*100 to get percentage split.

Ratio Calculator - Multiple Calculators

Ratio Calculator

Calculate ratios, proportions, and scale factors.

Original Ratio

Enter two values to instantly simplify a ratio and convert it to decimal and percentage.

Width (W1)

Height (H1)

Your Results

Simplified

--:--

Ratio

--:--

As Decimal

Percentage split

--% / --%

Visual ratio

Scale to New Size

Enter a new width or a new height and keep the same proportion automatically.

New Width (W2)

New Height (H2)

New Width

New Height

Scale Factor

Enter either width or height - the other dimension will automatically calculate to maintain the original ratio

Ratio Calculator Hub

This page is your all-in-one ratio hub. Enter any two values and get instant outputs for:

simplified ratio
decimal ratio
percentage split
proportional scaling for width/height

If you need one specific task, use these focused tools:

How to simplify a ratio

To simplify a:b, divide both numbers by their greatest common divisor (GCD).

Example:

12:18
GCD is 6
simplified ratio is 2:3

Formula:

simplified = (a / gcd(a,b)) : (b / gcd(a,b))

Ratio to decimal and percentage

Given ratio a:b:

Decimal value of the ratio is a / b
Percentage split is:
- first part: a / (a + b) * 100
- second part: b / (a + b) * 100

Example for 3:2:

Decimal: 1.5
Percentage split: 60% / 40%

Scale ratio to new size

When you keep a proportion, one side controls the other.

New height: newWidth * originalHeight / originalWidth
New width: newHeight * originalWidth / originalHeight

That is useful for:

image resizing
video dimensions
print/layout scaling
UI and design work

Common ratio examples

16:9 (widescreen video)
4:3 (legacy display/photo)
3:2 (many camera sensors)
1:1 (square social format)

FAQ

What is the difference between ratio and fraction?

A ratio compares two quantities, while a fraction usually represents part of a whole. A ratio can be written as a fraction, but context matters.

Does order matter in a ratio?

Yes. 2:3 is not the same as 3:2.

Can I use decimals in a ratio?

Yes. This calculator accepts decimals and still returns simplified and converted outputs.

Can I copy the result?

Yes. Use the copy controls in the result cards to quickly paste into docs, design specs, or code.