Quick, reliable geometric analysis for area, perimeter, and diagonals.
Area (A)
Perimeter (P)
Diagonal (d)
Disclaimer: Calculations are provided for informational and educational purposes. Verify actual values before starting construction or technical projects.
Step 01
Determine the straight-line measurement of the longer horizontal or vertical side of your rectangle.
Step 02
Measure the adjacent perpendicular side. Ensure both measurements share the same unit (inches, feet, meters, etc.).
Step 03
Type Side A and Side B into the designated fields. The engine calculates the results in real time.
Step 04
Check the resulting area, perimeter length, diagonal distance, and aspect ratio for your design or project.
| Shape | Area Formula | Internal Angles |
|---|---|---|
| Rectangle | a × b | 4 × 90° (360°) |
| Square | a² | 4 × 90° (360°) |
| Circle | π × r² | 360° Continuous |
Ensure both sides use matching units (e.g., both in meters or both in feet) to yield standard metric output.
Double check that corners form exact 90° right angles. Non-perpendicular boundaries require trigonometric formulas.
Measure both diagonal lines in real-world layouts. If both diagonals are equal, your corners are perfectly square.
A rectangle is a four-sided flat shape (quadrilateral) where every interior angle is a right angle (90 degrees). Opposite sides are equal in length and parallel to each other.
The diagonal splits the rectangle into two identical right-angled triangles. By using the Pythagorean theorem, the diagonal equals the square root of (Length² + Width²).
Yes! A square is a special type of rectangle where all four sides have equal length, yielding an aspect ratio of exactly 1:1.
Multiplying dimensions in different units (like feet by inches) produces incorrect areas. Always convert all sides to a single uniform unit before running calculations.