Convert Square Inch to Feddan
Convert square inches to feddans instantly. 1 square inch = 1.535792e-7 feddan — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Feddan to Square Inch converter for the reverse conversion.
Units explained
Square Inch
A square inch is an imperial unit of area equal to exactly 0.00064516 m², the area of a square with sides of one inch. It is widely used in the United States for small-area measurements.
Derived by squaring the inch. The inch was standardized to exactly 25.4 mm via the 1959 International Yard and Pound Agreement.
Square inches are used extensively in US engineering, manufacturing, real estate (for floor plans), and everyday small-area measurements. Engine displacement is often expressed in cubic inches but cross-sections in square inches.
Inch dates to medieval English usage; modern exact value standardized in 1959.
Feddan
A feddan is an Egyptian unit of land area equal to approximately 4200.83 m² (about 1.038 acres). Used in Egypt, Sudan, Syria, and Oman.
Originated as an Egyptian agricultural unit. Standardized at 4200.83 m² in modern Egyptian law (specifically, 333.33 qasaba squared).
Feddans are the primary unit for agricultural land in Egypt and several Arab countries. The conversion to hectares (1 feddan ≈ 0.42 hectare) is widely known regionally.
Standardized in modern Egyptian land law.
Square Inch to Feddan conversion formula
The relationship between square inches and feddans:
To convert square inches to feddans, multiply the value in square inches by 1.535792e-7. To reverse, multiply feddans by 6511299.5225990452.
How to use this converter
Type a value into the calculator. The result in feddans updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Feddan to Square Inch converter for the reverse direction.
Step-by-step: convert square inches to feddans
- Write down the value in square inches (in²).
- Multiply that value by the factor 1.535792e-7.
- The product is the equivalent value in feddans (feddan).
- To reverse, multiply the feddan value by 6511299.5225990452.
Worked examples
Example 1 — Convert 1 in² to feddan:
1 × 1.535792e-7 = 1.535792e-7 feddan
Example 2 — Convert 100 in² to feddan:
100 × 1.535792e-7 = 1.535792e-5 feddan
Real-world example — Feature-scale to long-haul
One billion square inches equals exactly one feddan — the conversion an optical-network engineer performs when totalling feature-level path lengths into a single long-haul fiber-link distance.
1e+9 in² × 1.535792e-7 = 153.5791736395 feddan
Real-world example — Fiber-optic link lengths
Converting from microscale square inches to the feddans of a long-haul fiber link is the conversion an optical engineer performs when calculating attenuation per kilometre of fiber.
1e+9 in² × 1.535792e-7 = 153.5791736395 feddan
Square Inch to Feddan conversion table
Standard reference values for converting square inches to feddans:
| Square Inch [in²] | Feddan [feddan] |
|---|---|
| 0.01 | 1.535792e-9 |
| 0.1 | 1.535792e-8 |
| 1 | 1.535792e-7 |
| 2 | 3.071583e-7 |
| 3 | 4.607375e-7 |
| 4 | 6.143167e-7 |
| 5 | 7.678959e-7 |
| 10 | 1.535792e-6 |
| 20 | 3.071583e-6 |
| 30 | 4.607375e-6 |
| 40 | 6.143167e-6 |
| 50 | 7.678959e-6 |
| 100 | 1.535792e-5 |
| 500 | 7.678959e-5 |
| 1000 | 0.0001535792 |
Frequently asked questions
How many feddans is 1 square inch?
How do I convert square inches to feddans?
How do I convert feddans back to square inches?
How many feddans is 100 square inches?
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Metric / SI (16 units)
Imperial / US Customary (14 units)
US Survey (5 units)
Indian Subcontinent (16 units)
Other Regional (10 units)
Scientific / Physics (5 units)
Historical / Pre-metric European (6 units)
Sources & references
Conversion factor (1 in² = 1.535792e-7 feddan) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.