Convert Square Chain to Square Inch
Convert square chains to square inches instantly. 1 square chain = 627263.9999379999 square inch — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Inch to Square Chain converter for the reverse conversion.
Units explained
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 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.
Square Chain to Square Inch conversion formula
The relationship between square chains and square inches:
To convert square chains to square inches, multiply the value in square chains by 627263.9999379999. To reverse, multiply square inches by 1.594225e-6.
How to use this converter
Type a value into the calculator. The result in square inches 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 Inch to Square Chain converter for the reverse direction.
Step-by-step: convert square chains to square inches
- Write down the value in square chains (ch²).
- Multiply that value by the factor 627263.9999379999.
- The product is the equivalent value in square inches (in²).
- To reverse, multiply the square inch value by 1.594225e-6.
Worked examples
Example 1 — Convert 1 ch² to in²:
1 × 627263.9999379999 = 627263.9999379999 in²
Example 2 — Convert 100 ch² to in²:
100 × 627263.9999379999 = 6.27264e+7 in²
Square Chain to Square Inch conversion table
Standard reference values for converting square chains to square inches:
| Square Chain [ch²] | Square Inch [in²] |
|---|---|
| 0.01 | 6272.63999938 |
| 0.1 | 62726.3999938 |
| 1 | 627263.9999379999 |
| 2 | 1254527.9998759998 |
| 3 | 1881791.9998139995 |
| 4 | 2509055.9997519995 |
| 5 | 3136319.9996899995 |
| 10 | 6272639.999379999 |
| 20 | 1.254528e+7 |
| 30 | 1.881792e+7 |
| 40 | 2.509056e+7 |
| 50 | 3.13632e+7 |
| 100 | 6.27264e+7 |
| 500 | 3.13632e+8 |
| 1000 | 6.27264e+8 |
Frequently asked questions
How many square inches is 1 square chain?
How do I convert square chains to square inches?
How do I convert square inches back to square chains?
How many square inches is 100 square chains?
Popular area unit conversions
Convert Square Chain to other area units
Show all Square Chain conversions
Metric / SI (5 units)
Imperial / US Customary (14 units)
Sources & references
Conversion factor (1 ch² = 627263.9999379999 in²) 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.