
A ratio of 39 to 40 can be written as 39 to 40, 39:40, or 39/40. Furthermore, 39 and 40 can be the quantity or measurement of anything, such as students, fruit, weights, heights, speed and so on.
A ratio of 39 to 40 simply means that for every 39 of something, there are 40 of something else, with a total of 79.
In the box below, you can enter a number in either box and we will calculate the other number to keep the ratio of 39 to 40. In other words, we will calculate the corresponding equivalent ratio of 39:40 for you.
To calculate the left side of the ratio, our calculator multiplies the right side by 39 and then divides the product by 40. To calculate the right side of the ratio, our calculator multiplies the left side by 40 and then divides the product by 39. Answers are rounded to two decimals if necessary.
Below is a list of equivalent ratios of 39:40 that we created using our 39:40 ratio calculator above.
39:40
78:80
117:120
156:160
195:200
234:240
273:280
312:320
351:360
390:400
429:440
468:480
We have also created a pie chart for you to put 39:40 ratio in perspective. To do so, we divided a pie into 79 pieces and then colored 39 pieces green and 40 pieces blue. The pie will look exactly the same using any equivalent ratio of 39:40.

The green part of the pie covers 49.37% and the blue part covers 50.63%. To calculate the percentages, we divided each side of the ratio by its total and then multiplied by 100, like this:
(39 / 79)×100 ≈ 49.37
(40 / 79)×100 ≈ 50.63
In fractional terms, 39/40 of the pie above is colored in green. This means that the ratio of 39 to 40 or 39:40 can also be expressed as a fraction, where the 39 to the left of the colon is the numerator and the 40 to the right of the colon is the denominator:
39:40 = 39/40
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 39 to 40, the width is 39 and the height is 40. Below is a picture of what a rectangle with a ratio of 39:40 looks like.

Since the simplest form of the fraction 39/40 is 39/40, the simplest form of the ratio 39:40 is also 39:40.
Ratio Calculator
Need information about another ratio? Here you can submit another ratio for us to explain.
Ratio of 39 to 41
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