Rectangle Diagonal Calculator
Calculate the length of the diagonal of a rectangle or screen from its length and width using Pythagoras. Enter length and width to see diagonal…
8 of 8 free uses remaining today
Calculate the length of the diagonal of a rectangle or screen from its length and width using Pythagoras. Enter length and width to see diagonal when you calculate.
Worked example
Example calculated from the starting values. Enter your own values and press Calculate to get your result.
With the default inputs (length = 8, width = 6), the results are: diagonal 10.000.
Quick reference: length vs result
Reference table based on the example values; it is not your calculation result.
| Length | Diagonal |
|---|---|
| 4 | 7.211 |
| 8 | 10.000 |
| 16 | 17.088 |
| 40 | 40.447 |
| 80 | 80.225 |
| 160 | 160.112 |
Frequently asked questions
What formula does this calculator use?
Diagonal = sqrt(l^2+w^2). Variables: l = length, w = width.
What do I need to enter?
You need length, width. Results update as you type.
What is an example result?
With the default inputs (length = 8, width = 6), the results are: diagonal 10.000.
Related Tools
View allCircle Area Calculator
Calculate the area and circumference of a circle from its radius. Enter the radius in any unit and the results use the same unit squared for area.
Rectangle Area and Perimeter Calculator
Find the area and perimeter of a rectangle from its length and width. Use any consistent unit, and the area is returned in that unit squared.
Triangle Area Calculator
Calculate the area of a triangle from its base and perpendicular height. Enter both measurements in the same unit to get the area in that unit squared.
Pythagorean Theorem Calculator
Find the hypotenuse of a right-angled triangle from the two shorter sides. Enter sides a and b, and the calculator returns c using the formula a…