Free · Measurement and planning

Screen Width Height and Ratio

Relate screen rectangle width and height using a selected ratio preset or supplied dimensions.

Calculator inputs

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Enter the known values in the units shown. Results update as you type.
Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
Use the worked example to check the method. Reset restores the starting fields.

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

A width of 10 at 5:4 ratio gives a height of 8.

Width / height = aspect ratio.

Enter these known values and leave the other values blank.

Use positive width and height in matching units.
Ratio means width divided by height. It describes rectangle shape and does not change image resolution.
Results follow the stated ideal arithmetic model. Display rounding does not change the underlying calculation.
Supply sufficient known values and leave the desired quantity blank. Controls retain captured inverse branches and units.
Some retained ratio presets use rounded decimal constants, including 4:3. Exact integer-ratio geometry can differ slightly from these approximations.
If a retained lock prevents a reverse calculation, unlock the quantity you want to solve before supplying the known values.

Width / height = aspect ratio.

Available selectors convert the entered physical quantity. Use compatible units for all related quantities.

A missing input, invalid denominator or underdetermined relationship cannot provide a unique finite result.

Use exact-sign physical domains, exact discrete counts where applicable, and documented model bounds. Source arithmetic is preserved.