Free area calculator for land — draw a polygon, triangulate with diagonals, enter side lengths in metres, feet, or links, then calculate total plot area or cutting-point offsets. For coordinate-based surveys use the coordinates area calculator; for plot partition steps see our plot division guide.
Short link
/land-area/
Runs in your browser
Load once online; then works offline for this session if scripts cached
How to use
1. Draw polygon
2. Add diagonals
3. Enter lengths
4. Calculate
Drawing polygon
No points yet
Click near point 0 to close the polygon
How It Works
1. Draw the polygon
Click on the canvas to add corner points. Click near the first point to close the shape.
2. Triangulate with diagonals
For shapes with 4+ sides, click two non-adjacent points to draw each diagonal until fully triangulated.
3. Enter measurements
Fill in all side and diagonal lengths in your chosen unit, then calculate area or cutting-point offsets.
Corrections & questions
These guides are maintained for practising AP surveyors. If a step is outdated or wrong, tell us — we prioritise field corrections.
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