Ratio of 3 to 7

Ratio of 3 to 7

A ratio of 3 to 7 can be written as 3 to 7, 3:7, or 3/7. Furthermore, 3 and 7 can be the quantity or measurement of anything, such as students, fruit, weights, heights, speed and so on.

A ratio of 3 to 7 simply means that for every 3 of something, there are 7 of something else, with a total of 10.

In the box below, you can enter a number in either box and we will calculate the other number to keep the ratio of 3 to 7. In other words, we will calculate the corresponding equivalent ratio of 3:7 for you.


To calculate the left side of the ratio, our calculator multiplies the right side by 3 and then divides the product by 7. To calculate the right side of the ratio, our calculator multiplies the left side by 7 and then divides the product by 3. Answers are rounded to two decimals if necessary.

Below is a list of equivalent ratios of 3:7 that we created using our 3:7 ratio calculator above.













We have also created a pie chart for you to put 3:7 ratio in perspective. To do so, we divided a pie into 10 pieces and then colored 3 pieces green and 7 pieces blue. The pie will look exactly the same using any equivalent ratio of 3:7.

3 to 7 pie ratio

The green part of the pie covers 30% and the blue part covers 70%. To calculate the percentages, we divided each side of the ratio by its total and then multiplied by 100, like this:

(3 / 10)×100 = 30
(7 / 10)×100 = 70

In fractional terms, 3/7 of the pie above is colored in green. This means that the ratio of 3 to 7 or 3:7 can also be expressed as a fraction, where the 3 to the left of the colon is the numerator and the 7 to the right of the colon is the denominator:

3:7 = 3/7

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 3 to 7, the width is 3 and the height is 7. Below is a picture of what a rectangle with a ratio of 3:7 looks like.

3 to 7 pie rectangle

Since the simplest form of the fraction 3/7 is 3/7, the simplest form of the ratio 3:7 is also 3:7.

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


Ratio of 3 to 8
Go to the next ratio on our list that we have detailed information about.

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