Calculate the area of a circular sector from radius and angle, diameter and angle, arc length and radius, or a fraction of a circle. Estimate square feet, square inches, square yards, square meters, arc length, chord length, perimeter, waste, material quantity, and cost.
Radius and angle mode:
The calculator finds the full circle area, then multiplies by the angle divided by 360.
Diameter and angle mode:
The calculator divides the diameter by 2 to get the radius, then calculates the sector area.
Arc length and radius mode:
The calculator estimates sector area using arc length and radius, then calculates the central angle.
Fraction mode:
The calculator uses the percent of a circle to estimate sector area, angle, arc length, and perimeter.
A sector area calculator helps estimate wedge-shaped circular spaces for patios, pools, garden beds, fire pits, paver designs, landscaping, and construction layouts.
It can help calculate square footage, compare area units, estimate arc length, estimate material quantity, add waste, and estimate project cost.
Your result shows the sector area, central angle, radius, diameter, arc length, chord length, sector perimeter, area with extra waste, estimated pieces or units needed, and estimated cost.
Divide the central angle by 360, then multiply by the full circle area. The formula is Sector Area = (Angle ÷ 360) × π × Radius².
A sector is a wedge-shaped part of a circle formed by two radii and the arc between them.
Multiply the radius by the arc length, then divide by 2. The formula is Sector Area = 1/2 × Radius × Arc Length.
Add the two radius sides and the arc length. The formula is Sector Perimeter = 2 × Radius + Arc Length.
Yes. Curved and wedge-shaped layouts often create cuts and offcuts. For pavers, sod, landscaping fabric, tile, concrete, mulch fabric, or flooring, adding 5% to 15% extra is commonly helpful.