Convert Square Foot to Square Chain
Convert square feet to square chains instantly. 1 square foot = 0.0002295684 square chain — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Chain to Square Foot converter for the reverse conversion.
Units explained
Square Foot
A square foot is an imperial unit of area equal to exactly 0.09290304 m². It is the dominant unit for real estate area measurement in the United States and is widely used in India for residential property listings.
Derived by squaring the foot. The foot was standardized to exactly 0.3048 m via the 1959 International Yard and Pound Agreement.
Square feet are the standard unit for US real estate floor area, HVAC capacity ratings (BTU per ft²), commercial leasing, and construction. In India, square feet is the dominant unit for residential property advertisements alongside traditional regional units.
Foot dates to ancient civilizations; modern exact value standardized in 1959.
Square Chain
A square chain is an imperial unit of area equal to approximately 404.686 m². It equals 1/10 of an acre.
Derived by squaring the chain (66 feet or 22 yards). The chain was defined by Edmund Gunter in 1620 specifically so that 10 square chains equal exactly one acre.
Square chains appear in US Public Land Survey System (PLSS) records and historical English property documents. The 10-to-1 ratio with acres made early survey arithmetic easier.
Defined by Edmund Gunter in 1620 specifically for surveying convenience.
Square Foot to Square Chain conversion formula
The relationship between square feet and square chains:
To convert square feet to square chains, multiply the value in square feet by 0.0002295684. To reverse, multiply square chains by 4355.9999995694.
How to use this converter
Type a value into the calculator. The result in square chains updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Square Chain to Square Foot converter for the reverse direction.
Step-by-step: convert square feet to square chains
- Write down the value in square feet (ft²).
- Multiply that value by the factor 0.0002295684.
- The product is the equivalent value in square chains (ch²).
- To reverse, multiply the square chain value by 4355.9999995694.
Worked examples
Example 1 — Convert 1 ft² to ch²:
1 × 0.0002295684 = 0.0002295684 ch²
Example 2 — Convert 100 ft² to ch²:
100 × 0.0002295684 = 0.0229568411 ch²
Real-world example — Hardware-scale dimensions
A 10-square foot fastener or component is about as long as a thumbnail. Mechanics and DIY enthusiasts convert between square feet and square chains daily when mixing metric and imperial tools.
10 ft² × 0.0002295684 = 0.0022956841 ch²
Real-world example — Postcard and small-object dimensions
A postcard is about 5 square feet wide. Converting to square chains is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 ft² × 0.0002295684 = 0.0011478421 ch²
Real-world example — Ruler-scale measurements
A 30-square foot school ruler converts cleanly to square chains — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 ft² × 0.0002295684 = 0.0068870523 ch²
Square Foot to Square Chain conversion table
Standard reference values for converting square feet to square chains:
| Square Foot [ft²] | Square Chain [ch²] |
|---|---|
| 0.01 | 2.295684e-6 |
| 0.1 | 2.295684e-5 |
| 1 | 0.0002295684 |
| 2 | 0.0004591368 |
| 3 | 0.0006887052 |
| 4 | 0.0009182736 |
| 5 | 0.0011478421 |
| 10 | 0.0022956841 |
| 20 | 0.0045913682 |
| 30 | 0.0068870523 |
| 40 | 0.0091827365 |
| 50 | 0.0114784206 |
| 100 | 0.0229568411 |
| 500 | 0.1147842057 |
| 1000 | 0.2295684114 |
Frequently asked questions
How many square chains is 1 square foot?
How do I convert square feet to square chains?
How do I convert square chains back to square feet?
How many square chains is 100 square feet?
Popular area unit conversions
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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 ft² = 0.0002295684 ch²) 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 Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.