Convert Square Foot to Tsubo
Convert square feet to tsubos instantly. 1 square foot = 0.0281030431 tsubo — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Tsubo 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.
Tsubo
A tsubo is a Japanese unit of area equal to approximately 3.3058 m² (about 35.58 square feet). It is functionally identical to the Korean pyeong.
Defined as a 6-by-6 shaku square; the shaku is the traditional Japanese foot. Standardized as 400/121 m² in modern Japanese law.
Tsubos remain in widespread use in Japanese real estate, particularly for residential apartments and small commercial spaces. Property listings often cite both tsubo and square meters.
Traditional Japanese unit; legally retained in Japan for real estate.
Square Foot to Tsubo conversion formula
The relationship between square feet and tsubos:
To convert square feet to tsubos, multiply the value in square feet by 0.0281030431. To reverse, multiply tsubos by 35.5833350556.
How to use this converter
Type a value into the calculator. The result in tsubos updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Tsubo to Square Foot converter for the reverse direction.
Step-by-step: convert square feet to tsubos
- Write down the value in square feet (ft²).
- Multiply that value by the factor 0.0281030431.
- The product is the equivalent value in tsubos (tsubo).
- To reverse, multiply the tsubo value by 35.5833350556.
Worked examples
Example 1 — Convert 1 ft² to tsubo:
1 × 0.0281030431 = 0.0281030431 tsubo
Example 2 — Convert 100 ft² to tsubo:
100 × 0.0281030431 = 2.8103043136 tsubo
Real-world example — Furniture and large objects
A 72-square foot piece of furniture converts to a value in tsubos that's easier to mentally compare with room dimensions. This is the typical workflow when shopping internationally and product specs use a different unit than your room measurements.
72 ft² × 0.0281030431 = 2.0234191058 tsubo
Real-world example — Children's height milestones
A 150-square foot-tall child measures a value in tsubos that's commonly used for theme-park ride height requirements when travelling between countries that use different measurement units.
150 ft² × 0.0281030431 = 4.2154564704 tsubo
Real-world example — Body height conversion
You enter your height as 180 square feet into an international job or visa application. The form then asks for the same value in tsubos — converting between these adjacent units is one of the most-used length conversions globally.
180 ft² × 0.0281030431 = 5.0585477645 tsubo
Square Foot to Tsubo conversion table
Standard reference values for converting square feet to tsubos:
| Square Foot [ft²] | Tsubo [tsubo] |
|---|---|
| 0.01 | 0.0002810304 |
| 0.1 | 0.0028103043 |
| 1 | 0.0281030431 |
| 2 | 0.0562060863 |
| 3 | 0.0843091294 |
| 4 | 0.1124121725 |
| 5 | 0.1405152157 |
| 10 | 0.2810304314 |
| 20 | 0.5620608627 |
| 30 | 0.8430912941 |
| 40 | 1.1241217255 |
| 50 | 1.4051521568 |
| 100 | 2.8103043136 |
| 500 | 14.0515215682 |
| 1000 | 28.1030431363 |
Frequently asked questions
How many tsubos is 1 square foot?
How do I convert square feet to tsubos?
How do I convert tsubos back to square feet?
How many tsubos 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 = 0.0281030431 tsubo) 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.