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Sri Lanka Land Area Converter

Direct Conversion Summary: In Sri Lanka, 1 Perch = 272.25 Square Feet (approximately 25.2929 Square Metres). An Acre equals 4 Roods or 160 Perches (43,560 sq ft). Enter any value below to see it converted across all units.
✓ Last verified 2026-09-09
Enter a numeric extent to convert across all supported units
Common Extents:
Survey Plan / Title Notation ExtentA-R-P Breakdown
0A - 0R - 10P
Total Extent: 10 Perches. This breakdown helps you read land extents as they're commonly recorded in Sri Lankan survey plans and deeds.
Equivalent Extents Across Supported Units
PerchesP
10
Square Feetsq ft
2,722.5
AcresA
0.0625
RoodsR
0.25
Square Metresm²
252.9285
Hectaresha
0.0253

Verified Sources & Land Unit Definitions

Survey Department of Sri Lanka (Established Cadastral & Surveying Standard (Acres, Roods, Perches)) • Measurement Units, Standards and Services Department (MUSSD) (Statutory Authority for SI Units (Act No. 35 of 1995)) • Bureau International des Poids et Mesures (BIPM) (International SI Base Units & 1959 International Yard and Pound Agreement)

Attribution Distinction: Land extents in Sri Lanka follow established cadastral survey definitions (1 perch = 16.5 ft × 16.5 ft = 272.25 sq ft; 1 rood = 40 perches; 1 acre = 160 perches). Metric conversions are mathematically derived from the statutory international foot (1 ft = 0.3048 m exact), which yields 25.29285264 m² per perch. Square metre (m²) is the canonical calculation unit, with precision rounding applied to the displayed values.

Last Verified: 2026-09-09
Volatility Tier:GREEN (Permanent Mathematical Constants)

Official Land Conversion Factors in Sri Lanka

Land transactions, title deeds, and valuation reports in Sri Lanka frequently use both imperial units (perches, roods, acres) and metric units (square metres, hectares). The table below shows the exact relationships:

Unit Symbol Equivalent in Perches Square Feet Square Metres (m²)
1 Perch P 1 Perch 272.25 sq ft 25.2929 m²
1 Rood R 40 Perches 10,890 sq ft 1,011.7141 m²
1 Acre A 160 Perches 43,560 sq ft 4,046.8564 m²
1 Square Metre m² ≈ 0.0395 Perch ≈ 10.7639 sq ft 1.0 m²
1 Hectare ha ≈ 395.3686 Perches ≈ 107,639.1 sq ft 10,000.0 m²

Interpreting Acres, Roods, and Perches (A-R-P) on Survey Plans

When reviewing a cadastral survey plan or deed extract in Sri Lanka, the land extent is typically stated in the three-part compound format: A - R - P.

For instance, an extent recorded as 0A - 2R - 15P denotes:

  • 0 Acres = 0 Perches
  • 2 Roods = 2 × 40 = 80 Perches
  • 15 Perches = 15 Perches
  • Total Extent = 80 + 15 = 95 Perches (25,863.75 sq ft or 2,402.82 m²)

Use our calculator to enter values either as a single unit, or directly into the A-R-P fields, to quickly interpret surveyor notation.

Frequently Asked Questions

How many square feet are in 1 perch in Sri Lanka?

In Sri Lanka, 1 perch is defined as exactly 272.25 square feet (16.5 feet × 16.5 feet). In metric units, 1 perch equals approximately 25.2929 square metres (25.29285264 m² exact).

How do you convert square feet back to perches in Sri Lanka?

To convert square feet to perches, divide the total square feet by 272.25. For example, a standard 2,722.5 sq ft plot equals exactly 10 perches (2,722.5 ÷ 272.25 = 10).

How many perches make an acre or a rood?

1 Rood equals 40 perches (10,890 square feet). 1 Acre equals 4 roods or 160 perches (43,560 square feet).

How do you read Acres-Roods-Perches (A-R-P) notation on a survey plan?

On Sri Lankan cadastral survey plans and title deeds, land extent is commonly recorded in compound A-R-P notation. For example, '0A - 1R - 25P' denotes 0 Acres, 1 Rood (40 perches), and 25 Perches, totaling 65 perches (17,696.25 sq ft or 1,644.04 m²).

Not a bank quotation

This calculator is an independent planning tool, not a bank quotation. Figures are checked against the formulas above and dated when last verified.

Checked against
Dept. of Immigration & EmigrationDept. for Registration of PersonsSri Lanka PoliceRegistrar of CompaniesInland Revenue Dept.EPF / ETF DepartmentsSurvey DepartmentDepartment of Motor Traffic