Convert Square Foot to Chō
Convert square feet to chōs instantly. 1 square foot = 9.367719e-6 chō — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Chō 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.
Chō
A chō is a Japanese unit of large-scale area equal to approximately 9917.36 m² (about 0.991 hectare or 2.45 acres). It equals 3,000 tsubo.
Traditional Japanese land area unit, used historically for rice paddies and large estates.
Chōs appear in Japanese agricultural records and historical land documents. Modern usage favors hectares for new transactions but legacy records remain.
Traditional Japanese unit; standardized via the tsubo definition.
Square Foot to Chō conversion formula
The relationship between square feet and chōs:
To convert square feet to chōs, multiply the value in square feet by 9.367719e-6. To reverse, multiply chōs by 106749.5746102603.
How to use this converter
Type a value into the calculator. The result in chōs updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Chō to Square Foot converter for the reverse direction.
Step-by-step: convert square feet to chōs
- Write down the value in square feet (ft²).
- Multiply that value by the factor 9.367719e-6.
- The product is the equivalent value in chōs (chō).
- To reverse, multiply the chō value by 106749.5746102603.
Worked examples
Example 1 — Convert 1 ft² to chō:
1 × 9.367719e-6 = 9.367719e-6 chō
Example 2 — Convert 100 ft² to chō:
100 × 9.367719e-6 = 0.0009367719 chō
Real-world example — Architectural to geographic scale
A 100,000-square foot measurement equals one chō. The five-order-of-magnitude scale change comes up in mapping work where architectural site plans must be related to road-network maps.
100000 ft² × 9.367719e-6 = 0.9367718828 chō
Real-world example — Small to geographic-scale
100,000 square feet equals one chō — a useful conversion when small-scale survey diagrams must be related to road-network distances on a different map.
100000 ft² × 9.367719e-6 = 0.9367718828 chō
Square Foot to Chō conversion table
Standard reference values for converting square feet to chōs:
| Square Foot [ft²] | Chō [chō] |
|---|---|
| 0.01 | 9.367719e-8 |
| 0.1 | 9.367719e-7 |
| 1 | 9.367719e-6 |
| 2 | 1.873544e-5 |
| 3 | 2.810316e-5 |
| 4 | 3.747088e-5 |
| 5 | 4.683859e-5 |
| 10 | 9.367719e-5 |
| 20 | 0.0001873544 |
| 30 | 0.0002810316 |
| 40 | 0.0003747088 |
| 50 | 0.0004683859 |
| 100 | 0.0009367719 |
| 500 | 0.0046838594 |
| 1000 | 0.0093677188 |
Frequently asked questions
How many chōs is 1 square foot?
How do I convert square feet to chōs?
How do I convert chōs back to square feet?
How many chōs is 100 square feet?
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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 = 9.367719e-6 chō) 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.