Quadrilateral Calculator

The most complete quadrilateral calculator for students, engineers, architects, and geometry enthusiasts. Solve any quadrilateral instantly - just enter what you know.
Whether you're studying for an exam, designing a space, or solving a geometry problem, Quadrilateral Calculator gives you instant, accurate results with beautiful live visualization.

FOUR FLEXIBLE INPUT MODES
Enter whatever you have - the app figures out the rest:

XY Coordinates - place 4 points on a canvas and drag them freely
Side Lengths - enter a, b, c, d to get perimeter and area instantly
Diagonals - enter p, q and the angle between them
Angles - enter any 3 angles and the 4th is auto-calculated

COMPLETE CALCULATIONS
Every result you need, computed automatically:
• Perimeter and Area
• Diagonal lengths p and q
• All 4 interior angles α, β, γ, δ
• Side lengths a, b, c, d
• Midpoints and slopes of each side
• Inradius and Circumradius (where applicable)
• Step-by-step solution with formulas

AUTO-IDENTIFIES SHAPE TYPE
The app automatically detects and labels your shape:
Square · Rectangle · Rhombus · Parallelogram · Trapezoid · Kite · Arbitrary Quadrilateral

LIVE INTERACTIVE CANVAS
Drag any vertex to reshape the quadrilateral in real time
Pinch to zoom and pan the canvas
Toggle diagonals, angle arcs, midpoints, and vertex labels
Snap-to-grid for precise positioning
Reset canvas with one tap

UNIT CONVERSION BUILT IN
Switch between cm, m, inches, and feet instantly. All results update automatically.

STEP-BY-STEP SOLUTIONS
See every formula used - great for learning and checking your work. Tap any result to copy it to your clipboard instantly.

RANDOM SHAPE GENERATOR
Generate random quadrilaterals for practice in any input mode. Perfect for students and teachers.

DARK MODE & ALL SCREEN SIZES
Fully supports Dark Mode, iPhone, and iPad. Clean, minimal interface designed for focus.

Perfect for: high school geometry, college math, architecture, engineering, land surveying, carpentry, tile laying, graphic design, and anyone who works with four-sided shapes.

Thanks for your support and do visit nitrio.com for more apps for your iOS devices.