Area & Acreage · 27 free tools
Map Area, Land Area and Acreage Calculators
Area is the measurement people most often get wrong on a map, because it depends on the shape you trace and the projection behind the drawing. Start with the map area calculator to trace a boundary and read the enclosed area, use the acreage calculator when the answer should be in acres, and convert between units with the acres to hectares converter when the figure has to travel.
MapBench computes polygon area on the sphere rather than on the flattened screen, so a plot near the Arctic is not quietly understated the way a pixel-area measurement would understate it. What the geometry cannot know is where the legal parcel edge actually runs: fences, deed lines, easements and survey monuments are authoritative, and a drawn polygon is an estimate. Trace at a sensible zoom, compare with the deed area, and treat a large disagreement as a prompt to check the boundary rather than the units.
For the practical questions around land, use the farm, garden and fencing calculators for seed, soil, fence posts and irrigation. For circular ground, the radius hub covers circle area and radius-from-area conversions, and uploaded geometry can be measured with the GeoJSON area calculator instead of being drawn by hand.
Start with these
The three tools that answer the most common question in this cluster. Each page states its method, coverage and limits.
All area & acreage tools
Every tool in this cluster is linked from this page, so nothing here depends on a search box or a JavaScript menu to be reachable.
Map Area Calculator
PopularDraw a polygon and get area in m2, km2, acres, hectares.
WorldwideAcreage Map Calculator
PopularMeasure acres on a map by drawing the field or plot boundary.
WorldwideAcres to Hectares Converter
Convert acres into hectares and square metres.
WorldwideLot Size Calculator
PopularDraw a property boundary and get area in acres, square feet, m² and hectares.
WorldwideAcres to Square Feet Converter
Convert acres to square feet.
WorldwideCenter of Polygon Finder
Estimate the center point of a polygon drawn on the map.
WorldwideCircle Area From Radius Calculator
Calculate circle area and circumference from radius.
WorldwideCircle Circumference From Radius
Calculate circumference and diameter from circle radius.
WorldwideEqual Circle Overlap Calculator
Calculate overlap area and percentage for two equal-radius circles.
WorldwideHectares to Acres Converter
Convert hectares into acres and square metres.
WorldwideHectares to Square Kilometres Converter
Convert hectares into square kilometres.
WorldwideLand Cost Per Acre Calculator
Calculate land price per acre from total price and acreage.
WorldwideLand Cost Per Square Foot Calculator
Calculate property land cost per square foot and square metre.
WorldwideLot Depth From Area and Width
Calculate rectangular lot depth from known area and width.
WorldwideLot Width From Area and Depth
Calculate lot width from known area and depth.
WorldwidePerimeter Calculator
Measure the perimeter of a polygon drawn on the map.
WorldwidePoints in Polygon Helper
Compare point sets and polygon areas visually on the map.
WorldwidePolygon Area From Coordinates
Estimate polygon area from pasted latitude/longitude vertices.
WorldwideRadius From Circle Area Calculator
Find circle radius and diameter from a known area.
WorldwideRadius From Circumference Calculator
Find circle radius and diameter from circumference.
WorldwideRectangular Lot Acreage Calculator
Convert rectangular lot dimensions into square feet, acres and hectares.
WorldwideSquare Acreage From Perimeter
Estimate square area and acreage from total perimeter.
WorldwideSquare Kilometers to Square Miles Converter
Convert square kilometres to square miles and hectares.
WorldwideSquare Meters to Hectares Converter
Convert square metres into hectares.
WorldwideSquare Miles Calculator
Measure an area on the map and read square miles, km² and acres.
WorldwideSquare Miles to Square Kilometers Converter
Convert square miles to square kilometres and hectares.
WorldwideSquare Perimeter From Area Calculator
Calculate side length and perimeter of a square from area.
WorldwideLearn more about area & acreage
Guides explain the method behind these numbers, the cases where it misleads, and how to choose between two tools that look interchangeable.
- How to Measure Land Area on a Map: Acres, Hectares and Square FeetLearn how map-based area measurement works, how to trace a parcel more accurately, how acres and hectares relate, and when an online estimate is not enough.Read the guide →
- Map Projections Explained: Why Every Flat World Map Distorts SomethingUnderstand why flat maps change area, shape, distance or direction, why Mercator looks the way it does, and how to choose a projection for the job.Read the guide →
- Free Printable Blank Maps: How to Choose Outline, Labeled, or City VariantsClassroom worksheets, sales territories, and presentation slides need different map styles. How to pick blank vs labeled vs coloured — and SVG vs PNG.Read the guide →
You may also need
These clusters answer the questions that usually follow a area and acreage tools result.
Best-of lists in this cluster
- Best Free Online Map Tools
If you only bookmark one thing, bookmark the directory; if you bookmark three, take a radius map, a distance calculator and a coordinate converter.
- Best Free Map Radius Calculators
Draw one circle to bound the question, then convert it to a drive-time area before you promise anything to a customer.
- Best Online Geographic Calculators
Choose the calculator that names its model. The number matters less than knowing whether it came from a sphere, a network or a Census polygon.
- Best Free Mapping Tools for Students and Teachers
Classroom-safe means no accounts, no uploads and no data collection — which narrows the field considerably.
- Best Free Land Measurement Tools
Measure the boundary, convert the units, then check the number against the deed before you use it for anything that costs money.
- Best Free GIS Tools for Beginners
Before reaching for a desktop GIS, open the file in a browser viewer — most 'broken' files are a coordinate-order or delimiter problem.
- Best Free Printable Outline Maps
Clean geometry, no watermark, and a format you can actually edit — the three things most free blank map sites get wrong.
About this hub
27 tools are grouped here because they answer the same family of questions. Every result is produced in your browser from the method stated on its own page; for legal, surveying, safety-critical or regulated decisions, verify the answer with the responsible authority.