Ratio of 1 to 2

Ratio of 1 to 2

A ratio of 1 to 2 can be written as 1 to 2, 1:2, or 1/2. Furthermore, 1 and 2 can be the quantity or measurement of anything, such as students, fruit, weights, heights, speed and so on.

A ratio of 1 to 2 simply means that for every 1 of something, there are 2 of something else, with a total of 3.

In the box below, you can enter a number in either box and we will calculate the other number to keep the ratio of 1 to 2. In other words, we will calculate the corresponding equivalent ratio of 1:2 for you.


To calculate the left side of the ratio, our calculator multiplies the right side by 1 and then divides the product by 2. To calculate the right side of the ratio, our calculator multiplies the left side by 2 and then divides the product by 1. Answers are rounded to two decimals if necessary.

Below is a list of equivalent ratios of 1:2 that we created using our 1:2 ratio calculator above.













We have also created a pie chart for you to put 1:2 ratio in perspective. To do so, we divided a pie into 3 pieces and then colored 1 pieces green and 2 pieces blue. The pie will look exactly the same using any equivalent ratio of 1:2.

1 to 2 pie ratio

The green part of the pie covers 33.33% and the blue part covers 66.67%. To calculate the percentages, we divided each side of the ratio by its total and then multiplied by 100, like this:

(1 / 3)×100 ≈ 33.33
(2 / 3)×100 ≈ 66.67

In fractional terms, 1/2 of the pie above is colored in green. This means that the ratio of 1 to 2 or 1:2 can also be expressed as a fraction, where the 1 to the left of the colon is the numerator and the 2 to the right of the colon is the denominator:

1:2 = 1/2

Ratio is often used when defining rectangles in width:height format. Width and height can be feet, inches, centimeters, or any other kind of length. With a ratio of 1 to 2, the width is 1 and the height is 2. Below is a picture of what a rectangle with a ratio of 1:2 looks like.

1 to 2 pie rectangle

Since the simplest form of the fraction 1/2 is 1/2, the simplest form of the ratio 1:2 is also 1:2.

Ratio Calculator
Need information about another ratio? Here you can submit another ratio for us to explain.


Ratio of 1 to 3
Go to the next ratio on our list that we have detailed information about.

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