Ratio of 2 to 1

Ratio of 2 to 1

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

A ratio of 2 to 1 simply means that for every 2 of something, there are 1 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 2 to 1. In other words, we will calculate the corresponding equivalent ratio of 2:1 for you.


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

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













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

2 to 1 pie ratio

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

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

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

2:1 = 2/1

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 2 to 1, the width is 2 and the height is 1. Below is a picture of what a rectangle with a ratio of 2:1 looks like.

2 to 1 pie rectangle

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

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


Ratio of 2 to 2
Go to the next ratio on our list that we have detailed information about.

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