
A ratio of 70 to 80 can be written as 70 to 80, 70:80, or 70/80. Furthermore, 70 and 80 can be the quantity or measurement of anything, such as students, fruit, weights, heights, speed and so on.
A ratio of 70 to 80 simply means that for every 70 of something, there are 80 of something else, with a total of 150.
In the box below, you can enter a number in either box and we will calculate the other number to keep the ratio of 70 to 80. In other words, we will calculate the corresponding equivalent ratio of 70:80 for you.
To calculate the left side of the ratio, our calculator multiplies the right side by 70 and then divides the product by 80. To calculate the right side of the ratio, our calculator multiplies the left side by 80 and then divides the product by 70. Answers are rounded to two decimals if necessary.
Below is a list of equivalent ratios of 70:80 that we created using our 70:80 ratio calculator above.
7:8
14:16
21:24
28:32
35:40
42:48
49:56
56:64
63:72
70:80
77:88
84:96
We have also created a pie chart for you to put 70:80 ratio in perspective. To do so, we divided a pie into 150 pieces and then colored 70 pieces green and 80 pieces blue. The pie will look exactly the same using any equivalent ratio of 70:80.

The green part of the pie covers 46.67% and the blue part covers 53.33%. To calculate the percentages, we divided each side of the ratio by its total and then multiplied by 100, like this:
(70 / 150)×100 ≈ 46.67
(80 / 150)×100 ≈ 53.33
In fractional terms, 70/80 of the pie above is colored in green. This means that the ratio of 70 to 80 or 70:80 can also be expressed as a fraction, where the 70 to the left of the colon is the numerator and the 80 to the right of the colon is the denominator:
70:80 = 70/80
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 70 to 80, the width is 70 and the height is 80. Below is a picture of what a rectangle with a ratio of 70:80 looks like.

Since the simplest form of the fraction 70/80 is 7/8, the simplest form of the ratio 70:80 is also 7:8.
Ratio Calculator
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Ratio of 70 to 81
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