*Measuring Tape, Conversion & Land Measurement Guide
*
1) Measuring Tape Specifications
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Width of tape → 12 mm, 16 mm, 19 mm, 25 mm, 30 mm.
- Narrow tapes (12–16 mm) = carpentry, tailoring.
- Wide tapes (19–30 mm) = construction, survey, site use.
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Length of tape → 2 m, 3 m, 5 m, 7.5 m, 10 m, 15 m, 30 m, 50 m, 100 m.
- Pocket tape = 2–5 m.
- Survey tape = 30–100 m.
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Material → Steel (strong, accurate), Fiberglass (rust-free), Cloth (soft).
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Graduations → Metric (mm, cm, m), Imperial (inch, feet, yard), or both (dual scale).
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Accuracy class →
- Class I = High accuracy.
- Class II = Normal construction.
- Class III = General use.
2)Basic Conversions (International Units)
- 1 inch = 25.4 mm.
1 foot = 12 inch = 304.8 mm = 0.3048 m.
- 1 meter = 100 cm = 1000 mm = 39.37 inch = 3.2808 feet.
- 1 yard = 3 feet = 36 inch = 0.9144 m.
1 acre = 43,560 sq ft = 4047 sq m = 4840 sq yd = 0.4047 hectare.
1 soot (local) ≈ 3 mm
3)Examples of Conversions
- 48 inch = 4 feet.
- 1 meter = 3.281 feet = 39.37 inch.
- 3 meter = 9 feet 10 inch ≈ 3.28 yard.
- 5 meter = 16 feet 5 inch ≈ 5.47 yard ≈ 1667 soot.
- 1 acre = square plot of ~208.7 ft × 208.7 ft.
4) Calibration of Tape
- Check zero point → hook must slide 1–2 mm.
- Compare with standard steel scale at 0, 100, 500, 1000 mm.
- Allowable error:
- Up to 5 m = ±0.5 mm.
- Up to 10 m = ±1.0 mm.
- Up to 20 m = ±1.5 mm.
- Note → steel expands in heat, so precision requires temperature consideration.
5) Indian Land Measurement Units
🔹 Guntha
- 1 Guntha = 1089 sq ft = 101.17 sq m.
- 40 Guntha = 1 Acre.
🔹 Cent
- 1 Cent = 435.6 sq ft = 40.47 sq m.
- 100 Cent = 1 Acre.
🔹 Bigha (varies by state)In UP/Bihar: 1 Bigha ≈ 27,000 sq ft.
- In Assam: 1 Bigha ≈ 14,400 sq ft.
- In Gujarat: 1 Bigha ≈ 17,424 sq ft.
🔹 Katha (varies by state)
- Bihar: 1 Katha = 1361 sq ft.
- Assam: 1 Katha = 2880 sq ft.
- Bengal: 1 Katha = 720 sq ft.
🔹 Gaj (Square Yard)
- 1 Gaj = 1 sq yd = 9 sq ft = 0.836 sq m.
- 1 Gajam (used in Telangana/Andhra) = 9 sq ft.
6) Quick Site Notes
- For building work: use feet, inch, meter, soot.
- For land survey: use yard, acre, guntha, cent, gaj.
- For record keeping: always convert to sq m (standard).
thank you,🙏
