Shaku (Japanese) to Centimeter Converter
Convert shaku to centimeters with our free online length converter.
Quick Answer
1 Shaku (Japanese) = 30.3 centimeters
Formula: Shaku (Japanese) × conversion factor = Centimeter
Use the calculator below for instant, accurate conversions.
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All conversion formulas on UnitsConverter.io have been verified against NIST (National Institute of Standards and Technology) guidelines and international SI standards. Our calculations are accurate to 10 decimal places for standard conversions and use arbitrary precision arithmetic for astronomical units.
Shaku (Japanese) to Centimeter Calculator
How to Use the Shaku (Japanese) to Centimeter Calculator:
- Enter the value you want to convert in the 'From' field (Shaku (Japanese)).
- The converted value in Centimeter will appear automatically in the 'To' field.
- Use the dropdown menus to select different units within the Length category.
- Click the swap button (⇌) to reverse the conversion direction.
How to Convert Shaku (Japanese) to Centimeter: Step-by-Step Guide
Converting Shaku (Japanese) to Centimeter involves multiplying the value by a specific conversion factor, as shown in the formula below.
Formula:
1 Shaku (Japanese) = 30.3 centimetersExample Calculation:
Convert 10 shaku: 10 × 30.3 = 303 centimeters
Disclaimer: For Reference Only
These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.
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Need to convert to other length units?
View all Length conversions →What is a Shaku (Japanese) and a Centimeter?
The Shaku (尺) is a traditional Japanese unit of length, forming a fundamental part of the traditional Japanese system of weights and measures known as the Shakkanhō (尺貫法). It is roughly equivalent to the English foot, although slightly shorter in its modern standardized form.
The Shaku is traditionally subdivided and multiplied decimally:
- 1 Jō (丈) = 10 Shaku
- 1 Shaku (尺) = 10 Sun (寸 - Japanese inch)
- 1 Sun (寸) = 10 Bu (分 - Japanese line)
There were historically different types of shaku, most notably the standard kanejaku (曲尺) used in carpentry and the longer kujirajaku (鯨尺) used for measuring cloth. Unless otherwise specified, "shaku" usually refers to the kanejaku.
The centimeter (symbol: cm) is a unit of length equal to exactly one-hundredth of a meter (1/100 m or 0.01 m). It's also equal to exactly 10 millimeters.
The centimeter is part of the International System of Units (SI) and uses the metric prefix "centi-" meaning one-hundredth (from Latin centum, "hundred").
Mathematical Relationships
1 centimeter equals:
- 10 millimeters (mm)
- 0.01 meters (m)
- 0.00001 kilometers (km)
- 0.393701 inches (in)
- 0.0328084 feet (ft)
Key conversion:
- 1 inch = 2.54 cm exactly (this is the official international definition established in 1959)
Why Centimeters?
While the meter is the official SI base unit for length, centimeters are more practical for everyday measurements:
Too small for meters, too large for millimeters: A person who is 1.75 meters tall is more commonly described as 175 centimeters in metric countries. Writing "1.75 m" requires decimals; "175 cm" uses whole numbers.
Human-scale convenience: Most objects people interact with daily—clothing, screens, body measurements, food items—fall naturally into the 1-100 cm range.
Avoids decimal confusion: "15.2 cm" is clearer than "0.152 m" for most people.
Note: The Shaku (Japanese) is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Centimeter belongs to the metric (SI) system.
History of the Shaku (Japanese) and Centimeter
The Shaku originated from the Chinese Chi (尺), introduced to Japan likely between the 3rd and 6th centuries AD. Like its Chinese counterpart, the length of the Shaku varied considerably across different historical periods and regions in Japan.
- Early Adoption: Early Japanese measurements were heavily influenced by Chinese standards, but the length of the Shaku began to diverge over time.
- Edo Period (1603–1868): Different standards coexisted, including the kanejaku (carpenter's shaku) and the kujirajaku (cloth shaku, literally "whale shaku," possibly referring to rulers made from whale baleen). The kanejaku became the more common standard for general measurement.
- Meiji Restoration (1868 onwards): Japan began modernizing and standardizing its systems. In 1891, the Weights and Measures Act defined the standard Shaku (kanejaku) legally in relation to the metric system as exactly 10/33 of a meter. This aimed to provide a precise conversion factor while preserving the traditional unit. The kujirajaku was defined as 1.25 times the kanejaku (i.e., 12.5/33 of a meter).
- Metrication: Japan officially adopted the metric system in 1951, and its use became mandatory for most official and commercial transactions by 1966. However, the Shaku and other Shakkanhō units remain in use in specific traditional fields.
French Revolution and the Birth of the Metric System
1790s: Revolutionary Innovation: The centimeter was born from the French Revolution's ambition to create a rational, universal measurement system based on nature and decimal mathematics.
The Meter Foundation: In 1791, the French Academy of Sciences defined the meter as one ten-millionth (1/10,000,000) of the distance from the equator to the North Pole along the meridian passing through Paris. The centimeter automatically followed as 1/100 of this meter.
Latin Roots: The prefix "centi-" derives from the Latin centum (hundred), making "centimeter" literally "hundredth of a meter."
1795 Official Adoption: France officially adopted the metric system on April 7, 1795, including the centimeter as a standard subdivision of the meter.
CGS System: The Centimeter's Scientific Era
1874: The Centimeter-Gram-Second System: British scientists James Clerk Maxwell and William Thomson (Lord Kelvin) promoted the CGS system, which used:
- Centimeter for length (instead of meter)
- Gram for mass (instead of kilogram)
- Second for time
Scientific Dominance: The CGS system became the preferred standard for physics and chemistry throughout the late 19th and early 20th centuries. Many scientific formulas and units were developed using centimeters.
Legacy Units: Several units still reflect the CGS heritage:
- Poise (viscosity): measured in gram/(centimeter·second)
- Erg (energy): gram·centimeter²/second²
- Gauss (magnetic field): CGS unit for magnetic flux density
Transition to SI and the Modern Era
1960: The SI System: The International System of Units (SI) was officially established, promoting the meter-kilogram-second (MKS) system instead of CGS.
Centimeter's Continued Relevance: Despite the official SI preference for meters, centimeters remained dominant for everyday measurements because:
- They're more practical for human-scale objects
- They avoid decimals for most common measurements
- They're familiar and intuitive
Global Adoption: Today, 195 of 198 countries use the metric system, with centimeters as the standard for body height, clothing, and everyday measurements. Only the United States, Myanmar, and Liberia officially use non-metric systems.
Common Uses and Applications: shaku vs centimeters
Explore the typical applications for both Shaku (Japanese) (imperial/US) and Centimeter (metric) to understand their common contexts.
Common Uses for shaku
While the metric system is standard in Japan, the Shaku persists in several areas:
- Traditional Japanese Architecture and Carpentry: The kanejaku is still widely used for measurements in building temples, shrines, traditional houses, and making furniture. Architectural modules like the ken (間) are often based on the Shaku. Japanese woodworking tools are often sized or marked in Shaku and Sun.
- Kimono and Traditional Clothing: The kujirajaku is the standard unit for measuring cloth width (tanmono) and dimensions when making kimonos and yukatas.
- Traditional Crafts: Used in making items like tatami mats, shōji screens, and other traditional crafts where historical dimensions are important.
- Musical Instruments: The length of traditional Japanese instruments, notably the shakuhachi (尺八) flute, is measured in Shaku and Sun (its name literally means "1.8 shaku").
- Martial Arts: Some traditional martial arts (koryū budō) may use Shaku-based measurements for weapon lengths (e.g., jō, bō) or stance dimensions.
- Gardening and Landscaping: Traditional Japanese garden design sometimes employs Shaku-based proportions.
- Historical and Cultural Context: Essential for understanding dimensions in historical texts, art, and artifacts.
When to Use centimeters
Medical and Healthcare
Growth Charts: Children's height is tracked in centimeters from birth:
- Pediatricians plot growth on percentile charts
- Birth length recorded in cm (typically 45-55 cm)
- Annual height measurements track development
Medical Measurements:
- Wound size: "3 cm laceration"
- Tumor diameter: measured in cm for staging
- Organ size: "enlarged liver extending 4 cm below rib cage"
- Dilation during childbirth: measured in cm (0-10 cm)
Medical Equipment:
- Blood pressure cuff width: 12-13 cm for adults
- Surgical incision length: documented in cm
- Catheter diameter: measured in mm, length in cm
Education and School Supplies
Rulers and Measuring Tools: Most rulers worldwide show centimeters:
- Standard ruler: 15 cm or 30 cm length
- Meter stick: 100 cm with cm markings
- Tape measures: marked in cm (and meters)
Paper Sizes (International ISO 216 Standard):
- A4 paper: 21 × 29.7 cm (most common worldwide)
- A5 paper: 14.8 × 21 cm (half of A4)
- A3 paper: 29.7 × 42 cm (double A4)
- Letter size (US): 21.6 × 27.9 cm (8.5 × 11 inches)
School Supplies:
- Pencil length: 19 cm (new)
- Notebook width: 15-21 cm
- Eraser length: 4-6 cm
Construction and Home Improvement
Tile Sizes: Floor and wall tiles measured in cm:
- Small tiles: 10×10 cm
- Medium tiles: 30×30 cm
- Large format tiles: 60×60 cm or 80×80 cm
- Subway tiles: 7.5×15 cm
Furniture Dimensions:
- Coffee table height: 40-50 cm
- Dining table height: 75 cm (standard)
- Chair seat height: 45-50 cm
- Sofa seat depth: 50-60 cm
Door Measurements:
- Standard interior door width: 80-90 cm
- Standard door height: 200-210 cm
- Door thickness: 3.5-4.5 cm
Art, Design, and Photography
Photo Print Sizes:
- 10×15 cm (4×6 inches) - standard print
- 13×18 cm (5×7 inches)
- 20×25 cm (8×10 inches)
- 30×40 cm (12×16 inches)
Canvas and Frame Sizes: Art supply stores sell in metric:
- Small canvas: 20×25 cm
- Medium canvas: 30×40 cm
- Large canvas: 50×70 cm
Drawing and Design:
- Technical drawings: dimensioned in cm or mm
- Graph paper: 0.5 cm or 1 cm grids
- Architectural scales: often use 1:50 or 1:100 (cm-based)
Sports and Recreation
Swimming Pool Depth: Measured in cm or meters:
- Shallow end: 90-120 cm
- Deep end: 180-300 cm
- Competition pool depth: minimum 200 cm
Bicycle Frame Sizes: Road bikes measured in cm:
- Small frame: 48-52 cm
- Medium frame: 54-56 cm
- Large frame: 58-62 cm
Sports Equipment:
- Tennis ball diameter: 6.5-6.7 cm
- Golf ball diameter: 4.3 cm
- Basketball diameter: 24 cm
Additional Unit Information
About Shaku (Japanese) (shaku)
How long is a Shaku?
The length depends on the context (historical vs. modern, type of shaku):
- Modern Standardized Kanejaku (since 1891):
- Exactly 10/33 meters (m)
- Approximately 0.30303 meters
- Approximately 30.303 centimeters (cm)
- Approximately 11.93 inches (in)
- Approximately 0.994 feet (ft)
- Modern Standardized Kujirajaku:
- Exactly 12.5/33 meters (m) (1.25 times the kanejaku)
- Approximately 0.37879 meters
- Approximately 37.879 centimeters (cm)
- Approximately 14.91 inches (in)
- Approximately 1.243 feet (ft)
- Historical Shaku: Varied significantly, often differing from the modern standard.
What are the subdivisions and multiples of the Shaku?
The system is decimal:
- Subdivisions: 1 Shaku = 10 Sun (寸); 1 Sun = 10 Bu (分).
- Multiples: 1 Jō (丈) = 10 Shaku. Another related unit is the Ken (間), traditionally 6 Shaku, though its length could vary.
Is it the same as the Chinese Chi?
No. Although the Japanese Shaku originated from the Chinese Chi (both written with the character 尺), they evolved independently and have different standardized lengths today.
- Modern Japanese Shaku (kanejaku): 10/33 meters (≈ 0.303 m)
- Modern Chinese Chi: 1/3 meter (≈ 0.333 m) The Shaku is noticeably shorter than the modern Chi.
What is the difference between kanejaku and kujirajaku?
They are two distinct traditional Shaku units:
- Kanejaku (曲尺): The "carpenter's shaku," used for general measurement, architecture, and woodworking. Standardized at 10/33 meters. This is the default meaning of "Shaku."
- Kujirajaku (鯨尺): The "cloth shaku" or "whale shaku," used primarily for measuring cloth, especially for kimonos. It is longer than the kanejaku, standardized at 12.5/33 meters (exactly 1.25 times the kanejaku).
Is the Shaku an SI unit?
No, the Shaku is not an SI unit. It is a traditional Japanese unit belonging to the Shakkanhō system. The SI base unit for length is the meter (m).
Is the Shaku still used today?
Yes, although Japan officially uses the metric system (SI units) for most purposes, the Shaku (both kanejaku and kujirajaku) continues to be used in specific traditional fields:
- Traditional architecture and carpentry.
- Kimono making and textile measurement.
- Other traditional crafts.
- Musical instrument making (e.g., shakuhachi).
- Historical and cultural studies. It is generally not used in everyday commerce or scientific contexts.
Conversion Table: Shaku (Japanese) to Centimeter
| Shaku (Japanese) (shaku) | Centimeter (cm) |
|---|---|
| 0.5 | 15.15 |
| 1 | 30.3 |
| 1.5 | 45.45 |
| 2 | 60.6 |
| 5 | 151.5 |
| 10 | 303 |
| 25 | 757.5 |
| 50 | 1,515 |
| 100 | 3,030 |
| 250 | 7,575 |
| 500 | 15,150 |
| 1,000 | 30,300 |
People Also Ask
How do I convert Shaku (Japanese) to Centimeter?
To convert Shaku (Japanese) to Centimeter, enter the value in Shaku (Japanese) in the calculator above. The conversion will happen automatically. Use our free online converter for instant and accurate results. You can also visit our length converter page to convert between other units in this category.
Learn more →What is the conversion factor from Shaku (Japanese) to Centimeter?
The conversion factor depends on the specific relationship between Shaku (Japanese) and Centimeter. You can find the exact conversion formula and factor on this page. Our calculator handles all calculations automatically. See the conversion table above for common values.
Can I convert Centimeter back to Shaku (Japanese)?
Yes! You can easily convert Centimeter back to Shaku (Japanese) by using the swap button (⇌) in the calculator above, or by visiting our Centimeter to Shaku (Japanese) converter page. You can also explore other length conversions on our category page.
Learn more →What are common uses for Shaku (Japanese) and Centimeter?
Shaku (Japanese) and Centimeter are both standard units used in length measurements. They are commonly used in various applications including engineering, construction, cooking, and scientific research. Browse our length converter for more conversion options.
For more length conversion questions, visit our FAQ page or explore our conversion guides.
Helpful Conversion Guides
Learn more about unit conversion with our comprehensive guides:
📚 How to Convert Units
Step-by-step guide to unit conversion with practical examples.
🔢 Conversion Formulas
Essential formulas for length and other conversions.
⚖️ Metric vs Imperial
Understand the differences between measurement systems.
⚠️ Common Mistakes
Learn about frequent errors and how to avoid them.
All Length Conversions
Other Length Units and Conversions
Explore other length units and their conversion options:
- Meter (m) • Shaku (Japanese) to Meter
- Kilometer (km) • Shaku (Japanese) to Kilometer
- Hectometer (hm) • Shaku (Japanese) to Hectometer
- Decimeter (dm) • Shaku (Japanese) to Decimeter
- Millimeter (mm) • Shaku (Japanese) to Millimeter
- Inch (in) • Shaku (Japanese) to Inch
- Foot (ft) • Shaku (Japanese) to Foot
- Yard (yd) • Shaku (Japanese) to Yard
- Mile (mi) • Shaku (Japanese) to Mile
- Nautical Mile (NM) • Shaku (Japanese) to Nautical Mile
Verified Against Authority Standards
All conversion formulas have been verified against international standards and authoritative sources to ensure maximum accuracy and reliability.
National Institute of Standards and Technology — Official US standards for length measurements
Bureau International des Poids et Mesures — International System of Units official documentation
Last verified: December 3, 2025