Aspect Ratio Calculator

Enter every measurement Aspect Ratio Calculator asks for, then press Calculate. The result stays blank while you are still typing.

Press Calculate after the entries are in.

What Aspect Ratio is for

Aspect Ratio Calculator is the page to open when you need aspect ratio from measurements you already have. It belongs with the other tv & video calculators because that is the work this arithmetic supports. The diagonal of that screen is the TV screen size. Type the entries first. The result stays hidden until you press Calculate, so a half-finished form never flashes a number you might mistake for the answer.

A 16:9 screen is 16 units wide and 9 units tall. The diagonal is the size printed on the box.

How to fill in this calculator

Custom Resolution. Enter the value this part of the job needs. The choices include ---, SD Video (4:3), HD Video (16:9), PC Monitor (16:10), Ultrawide Monitor (21:9), ---.

The formula in plain language

To add fractions, convert them to a common denominator, add the numerators, and reduce. A mixed number is a whole plus a fraction. Multiply the whole by the denominator and add the numerator before you do arithmetic. A ratio a:b = c:d solves for the missing term by cross-multiplying. Long division splits a number into a whole quotient and a remainder.

A worked example

1/2 plus 1/3 is 5/6. The mixed number 2 1/4 is 9/4. If 2:3 equals 8:d, then d is 12. 100 divided by 6 is 16 with a remainder of 4, or 16.666....

Diagonal, aspect ratio, and viewing distance describe one screen. This aspect ratio result should match pixels per inch and projector screen size.

Mistakes that move the answer

A denominator of zero is not a fraction.
Reduce the answer if you are comparing it with a tape that is marked in sixteenths.

How to check the result

After Calculate shows the aspect ratio result, redo the last operation with a pencil using the rounded figures on the screen. Matching that check means the inputs were read correctly. If you edit a label or a sentence in this HTML file, reload the page. The form and this article both live in the file, so the edit is what visitors will read.