Area Calculator
Calculate area for rooms, walls, patios, and landscape beds, then use that number in your tile, paint, mulch, or gravel estimate.
Last updated: March 23, 2026
Enter Shape Details
Units
Choose Shape
Measurements
Pick the shape that best matches the project section you are measuring. Rectangles work for most rooms, trapezoids help with tapered driveways, and triangles help with corner beds or angled wall runs.
Results
Calculation Steps
All Conversions
Good Next Uses
Use this area result before estimating tile, paint, mulch, gravel, flooring, or material volume.
How to Measure Project Area
1. Pick a shape
Match the shape to the section you are measuring. Treat each wall run, floor zone, bed, or pad as its own simple shape.
2. Enter dimensions
Measure each section in one unit system. Feet are usually best for US remodeling and landscape work, while meters help with larger metric jobs.
3. Check conversions
Check the converted outputs, then move to the calculator that fits your project instead of stopping at raw area.
Project Examples
Bedroom Floor
12 ft × 10 ft rectangle
Result: 120 sq ft
Use Flooring Calculator for planks, waste, and box counts.
Kitchen Backsplash Section
9 ft × 1.5 ft wall run
Result: 13.5 sq ft
Use Tile Calculator for tile boxes and grout planning.
Triangular Garden Bed
8 ft base × 5 ft height
Result: 20 sq ft
Use Mulch or Gravel Calculator after you set the material depth.
Tapered Driveway Section
6 ft + 10 ft bases × 4 ft height
Result: 32 sq ft
Use Gravel Calculator or a paving estimator once depth is set.
Angled Patio Cut-In
14 ft × 10 ft rectangle + 4 ft × 3 ft triangle
Result: 146 sq ft
Use Tile or Gravel Calculator once the finish material and depth are set.
What to Do With This Area
Rooms or floors
Flooring Calculator
Add plank coverage, waste, and box counts.
Walls or ceilings
Paint Calculator
Turn area into gallons and paint coats.
Wall tile sections
Tile Calculator
Convert area into tile quantity and grout.
Area vs Square Footage vs Volume
Measure section by section
Split real projects into simple sections instead of forcing everything into one rectangle. This works well for backsplashes, patios with returns, and tapered driveways.
Use area before material depth
Area gives you coverage. If the material is ordered by depth or volume, move to cubic feet, gravel, or mulch once the surface size is confirmed.
Choose square footage only when the job is mostly rectangular
If you are measuring simple rooms in feet, square footage is the shorter path. Use this page when shapes vary or you need metric and project routing in one place.
Area Formulas & Calculation Steps
Rectangle
A = l × w
Best for: bedrooms, backsplash runs, patios, and simple wall sections
Triangle
A = (b × h) ÷ 2
Best for: corner beds, angled sections, and gable-like wall areas
Circle
A = πr²
Best for: fire pit pads, round patios, and circular landscape rings
Trapezoid
A = ((a + b) × h) ÷ 2
Best for: tapered driveways, walkways, and angled yard sections
Parallelogram
A = b × h
Best for: slanted pads, offset feature walls, and layout sketches
Ellipse
A = πab
Best for: oval lawns, islands, and decorative pads
Sector
A = (θ ÷ 360) × πr²
Best for: curved patio slices and pie-shaped hardscape sections
Regular Polygon
A = n × s² ÷ (4 × tan(π ÷ n))
Best for: gazebo pads, hexagon patios, and decorative installations
Source: standard geometry formulas used in construction, drafting, and measurement references for common 2D project sections.
For irregular projects, calculate each section separately and combine the totals before moving into a tile, paint, mulch, gravel, or cubic-feet estimate.