Areas and planar shape measurements.
Choose the geometry that matches measured boundaries and known exclusions.
Choose the matching calculation
Square Footage & Area Calculator
Calculate square footage or square metres for one room or several mixed shapes, with exclusions and a combined total.
Circle Area Calculator
Find the plan area inside a measured circular boundary.
Triangle Area Calculator
Measure a triangular surface using a base and its perpendicular height.
Trapezoid Area Calculator
Measure a surface with two parallel edges of different lengths.
Ellipse Area Calculator
Find the plan area of an oval from its two full axis lengths.
Circular Sector Area Calculator
Find the area of a circular wedge from its radius and centre angle.
Ring Area Calculator
Find the area between two concentric circular boundaries.
Polygon Area Calculator
Measure an irregular plan outline from ordered coordinate points.
Triangle from Three Sides Calculator
Find area and perimeter when you can measure three edges but cannot measure a perpendicular height.
Circular Segment Area Calculator
Measure the area cut off by a straight chord of a circular boundary.
Capsule Area Calculator
Measure a straight central strip with two semicircular ends.
Triangle from Two Sides and Angle Calculator
Find the third edge and area from two measured edges and their included angle.
Overlapping Rectangle Union Calculator
Measure the combined covered area of axis-aligned rectangular zones without counting overlaps twice.
Bearing and Distance Traverse Calculator
Convert a measured chain of bearings and distances into a closed-plan area and show the remaining closure gap.
Station and Offset Strip Area Calculator
Estimate a measured strip area from irregularly spaced stations and left and right offsets.
Rounded Rectangle Area Calculator
Measure a rectangular outline with four equal rounded corners.
Regular Polygon Area Calculator
Measure a regular polygon from its side count and circumradius.
Overlapping Circular Areas Calculator
Avoid double counting where two circular measured areas overlap.
Measure and check your assumptions
Choose a triangle measurement method
Which triangle inputs can be measured reliably for your boundary?
Check a rounded corner radius against the full outline
Can four rounded corners fit the measured rectangle?
Distinguish polygon apothem from centre-to-corner radius
Which centre dimension did you measure on a regular polygon?
Count the union of overlapping circular measured areas
Are two circular bed or surface areas sharing a region?
Count shared rectangular coverage once
Does summing measured zones count a shared portion more than once?
Keep the closing edge visible in a measured traverse
What does an area result mean when the final measured point misses the start?
Why averaging oval diameters is not an exact perimeter
Can an ellipse boundary be treated as a circle with average diameter?
Read inside face distance rather than inside corner radius for staves
Does the inside ring dimension end at a flat face or a vertex?
Weight each measured station interval separately
Why does averaging all offset widths give the wrong strip area?
Keep a gable wall triangle separate from a sloping roof face
Why should a roof slope length not be used as gable wall height?
Do not assume every curved opening has a semicircular head
What changes when the supplied arch rise is less than half its width?
Keep the estimate within scope
Use your measured geometry and already supplied product specifications. Counts and quantities do not select a construction system or establish code compliance.
Collect chosen results in a free browser material project. Alternative scenarios remain separate orders.