Land Area Calculator (4 Sides + Diagonal)
Area of an irregular four-sided plot from its sides and one diagonal (two Herons).
Four sides alone do NOT fix a quadrilateral's area — the diagonal pins the shape. Patwari measurements that skip the diagonal can be gamed several percent either way.
Formula
Disclaimer: This tool is for general informational and estimation purposes only and is not professional financial, tax, accounting or legal advice. All figures are estimates — verify with a qualified professional before making decisions. Read the full disclaimer.
Land Area Calculator (4 Sides + Diagonal) is a free land area calculator for surveyors, civil engineers and property buyers — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Land Area Calculator (4 Sides + Diagonal)
Area of an irregular four-sided plot from its sides and one diagonal (two Herons). The calculation implements split by diagonal into two triangles; Heron's formula on each (Heron of Alexandria; plane surveying texts). Four sides alone do NOT fix a quadrilateral's area — the diagonal pins the shape. Patwari measurements that skip the diagonal can be gamed several percent either way.
How to use Land Area Calculator (4 Sides + Diagonal)
- 1Enter Side AB in m.
- 2Enter Side BC in m.
- 3Enter Side CD in m.
- 4Enter Side DA in m.
- 5Read Area, Square feet, Gaj (sq yd) instantly — no submit button needed.
- 6Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Land Area Calculator (4 Sides + Diagonal)?
- ✓Implements the standard formula — split by diagonal into two triangles; Heron's formula on each
- ✓Reference cited on-page: Heron of Alexandria; plane surveying texts
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Land Area Calculator (4 Sides + Diagonal) use?+
It computes split by diagonal into two triangles; Heron's formula on each, per Heron of Alexandria; plane surveying texts. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
Four sides alone do NOT fix a quadrilateral's area — the diagonal pins the shape. Patwari measurements that skip the diagonal can be gamed several percent either way.
Are regional land units exact?+
Conversion factors follow state revenue-department values noted on the tool. Units like bigha and katha vary by region, so always confirm the local factor named in your land records.
Is the Land Area Calculator (4 Sides + Diagonal) free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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