The Universal Area Converter, Land Cadastral Calculator & Geometric Scale Studio on RiazHub is a high-precision, in-browser metrology engine built for land surveyors, civil engineers, real estate developers, and property buyers worldwide. Operating with mathematical adherence to ISO 80000-3 space and area metrology standards, this tool converts seamlessly across 24+ international, regional, and historical land measurement units spanning five distinct measurement families: International SI Metric (square meters, hectares, ares, square kilometers), Imperial & US Customary (square feet, acres, square yards, sections, roods), South Asian Cadastral records (Marlas, Kanals, Murabbas, Bighas, Biswas, Gunthas), Middle Eastern systems (Metric Dunums, Ottoman Dunums, Feddans, Qirats), and East Asian metrics (Tsubos, Pyongs, Mus, Chos).
Addressing one of real estate’s most critical legal challenges, the calculator features a South Asian Cadastral Calibration Toggle that allows instant switching between the official British colonial Revenue Standard (272.25 sq ft Marla / 5.5-ft Karam) used in government deeds (Fard, Intiqal, Aks Shajra) and the modern Urban Housing Society Standard (225.00 sq ft Marla / 5.0-ft Karam) prevalent in master-planned developments. The studio also introduces a dual-deck workspace with an interactive 2D Geometric Plot Canvas Visualizer that renders scaled plot boundaries, dynamic aspect ratios, perimeter distances, and diagonal lengths via Pythagoras, alongside an intuitive Real-World Scale HUD benchmarking your parcel against FIFA football pitches, Olympic pools, and tennis courts.
In addition to multi-unit conversion and land boundary geometry with property price-per-unit estimation, users can generate high-resolution, shareable 1200×630 Area Specification Dossier Cards across four themes (Cyber Azure, Cadastral Emerald, Deep Obsidian, and Golden Estate) and export formatted CSV matrices, clipboard memos, or print-ready PDF briefs. Engineered with a 100% client-side, zero-API architecture, all computations remain strictly inside your browser with complete privacy and zero data leakage.
Universal Area Converter & Land Cadastral Studio
High-precision real-time conversion across 24+ metric, imperial, cadastral (Marla/Kanal/Murabba), Middle Eastern (Dunum), and East Asian land units with interactive geometric plot scaling.
South Asian Revenue Hierarchy & Patwari Terminology
In the land administration and cadastral survey records of Pakistan and Northern India, property boundaries are surveyed using the Karam (traditional surveying rod).
| Unit Name | Official Government Standard | Private Urban Society Standard | Equivalence / Subdivisions |
|---|---|---|---|
| 1 Karam | 5.5 Feet (66 inches) | 5.0 Feet (60 inches) | 1 Linear Surveyor Rod |
| 1 Sarsahi | 30.25 Sq Ft | 25.00 Sq Ft | 1 Sq Karam (1 Karam × 1 Karam) |
| 1 Marla | 272.25 Sq Ft (25.29 m²) | 225.00 Sq Ft (20.90 m²) | 9 Sarsahis (9 Sq Karams) |
| 1 Kanal | 5,445 Sq Ft (505.86 m²) | 4,500 Sq Ft (418.06 m²) | 20 Marlas |
| 1 Killa (Acre) | 43,560 Sq Ft (4,046.86 m²) | 43,560 Sq Ft (Fixed Imperial) | 8 Kanals (160 Marlas) |
| 1 Murabba | 1,089,000 Sq Ft (101,171 m²) | 25 Acres | 25 Killas / 200 Kanals |
In official revenue records (Fard, Intiqal, Aks Shajra), courts and registrars legally recognize the 272.25 sq ft Marla. Modern private housing authorities (e.g. DHA, Bahria Town, CDA) utilize the round 225 sq ft Marla for convenient master planning. When buying rural or inherited land, always verify whether your deed is drafted in Revenue Karams or Urban Societies!
Cadastral Land Measurement, ISO 80000-3 & Surveying Knowledge Base
9 × 30.25 = 272.25 sq ft. Consequently, 20 Marlas form 1 Kanal (5,445 sq ft), and 8 Kanals form 1 Acre (43,560 sq ft).However, private commercial housing societies standardized on a shorter 5.0-foot Karam to simplify architectural blueprints, resulting in
9 × 25 = 225 sq ft per Marla (and 4,500 sq ft per Kanal). This tool provides a dedicated instant toggle so you can calibrate your land valuation and deed verification to either standard with 100% precision.
- Hectare (ha): Metric SI accepted unit equal to 10,000 m² (~2.471 Acres or 19.76 Kanals). Widely used in Europe, Australia, and global forestry.
- Acre (ac): Imperial standard equal to 43,560 sq ft (~4,046.86 m² or 8 Kanals). Standard in the United States, UK, and South Asian farmland (often termed 'Killa').
- Metric Dunum (Donum): Middle Eastern standard standardized across Jordan, Palestine, Syria, Iraq, and Turkey as 1,000 m² (~0.247 Acres). The traditional Ottoman Dunum was 919.3 m².
Area = √(s(s - a)(s - b)(s - c)) where s = (a + b + c) / 2. The two triangles are then summed to yield the total exact square footage.