Centimeter to Aln Converter
Convert centimeters to alnar with our free online length converter.
Quick Answer
1 Centimeter = 0.016835 alnar
Formula: Centimeter × conversion factor = Aln
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.
Centimeter to Aln Calculator
How to Use the Centimeter to Aln Calculator:
- Enter the value you want to convert in the 'From' field (Centimeter).
- The converted value in Aln 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 Centimeter to Aln: Step-by-Step Guide
Converting Centimeter to Aln involves multiplying the value by a specific conversion factor, as shown in the formula below.
Formula:
1 Centimeter = 0.016835 alnarExample Calculation:
Convert 10 centimeters: 10 × 0.016835 = 0.16835 alnar
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.
Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.
Need to convert to other length units?
View all Length conversions →What is a Centimeter and a Aln?
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.
The Aln (Swedish), Alen (Danish and Norwegian) was a traditional Scandinavian unit of length, analogous to the English ell or cubit. Its length varied significantly by region and time but was generally based on the length of the forearm.
Key standardized or common values include:
- Swedish Aln: Officially standardized (as the Rydaholmsaln) in 1665 and confirmed in 1735 as exactly 2 Swedish fot (feet). This equates to approximately 0.5938 meters (or 59.38 cm / 23.38 inches).
- Danish Alen: The common standard (Sjællandsk alen) was 2 Danish fod (feet), equating to approximately 0.6277 meters (or 62.77 cm / 24.71 inches).
- Norwegian Alen: Often followed the Danish standard due to political union. After 1824, it was legally defined as 2 Norwegian fot, equating to 0.6275 meters (or 62.75 cm / 24.70 inches), very close to the Danish value.
The Aln/Alen was typically subdivided into 4 kvarter (quarters).
Note: The Centimeter is part of the metric (SI) system, primarily used globally in science and trade. The Aln belongs to the imperial/US customary system.
History of the Centimeter and Aln
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.
The Aln/Alen originates from the Proto-Germanic word for forearm (alinō), reflecting its basis as an anthropomorphic unit, similar to the cubit in other cultures. For centuries, its length was inconsistent, varying between regions, cities, and trades within Sweden, Denmark, and Norway.
- Early Variations: Numerous local standards existed, often based on physical rods kept by authorities or guilds.
- Standardization Efforts:
- Sweden: Attempts at standardization culminated in the adoption of the Rydaholmsaln (based on a specific iron standard bar from Rydaholm church) in 1665, defined as 2 fot. This standard (≈0.5938 m) became mandatory nationwide in 1735.
- Denmark & Norway: The Sjællandsk alen (Zealand ell, ≈0.6277 m) became the dominant standard in Denmark and, consequently, in Norway during their union. Norway later formally adopted a slightly different value (≈0.6275 m) based on its own fot definition in 1824.
- Metrication: The Aln/Alen was officially replaced by the metric system during the 19th and early 20th centuries: Norway in 1875, Sweden in 1889, and Denmark in 1907.
Common Uses and Applications: centimeters vs alnar
Explore the typical applications for both Centimeter (metric) and Aln (imperial/US) to understand their common contexts.
Common Uses for 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
When to Use alnar
Historically, the Aln/Alen was a fundamental unit for everyday trade and craft:
- Textiles: Its most prominent use was measuring cloth (wool, linen, silk). Standardization was often driven by the textile trade.
- Timber and Lumber: Measuring lengths of wood.
- Rope and Cordage: Measuring lengths of rope.
- Construction: Used in building measurements, though perhaps less formally than in trade.
- General Trade: Measuring various goods sold by length.
It was less commonly used for land surveying, where units like the stång (rod) or mil (mile) were preferred.
Additional Unit Information
About Aln (aln)
How long is an Aln/Alen?
There isn't one single value, as it depended on the country and era. The main official standards were:
- Swedish Aln: ~0.594 meters / ~23.4 inches
- Danish Alen: ~0.628 meters / ~24.7 inches
- Norwegian Alen: ~0.628 meters / ~24.7 inches (very close to Danish)
Always consider the context (Swedish, Danish, or Norwegian) when encountering this unit in historical documents.
What's the difference between the Aln in different countries?
The primary difference was length:
- The Swedish Aln (≈59.4 cm) was noticeably shorter than the Danish and Norwegian Alen (both ≈62.8 cm).
- All were typically defined as 2 local fot (feet), but the length of the fot itself varied between the countries.
Is the Aln related to the English Ell?
Yes, both the Aln/Alen and the English Ell are historical units of length derived from the concept of the cubit or forearm length (Latin ulna). However, their standardized lengths differed significantly. The most common English Ell was 45 inches (1.143 m), much longer than any standard Scandinavian Aln/Alen.
Is the Aln/Alen still used today?
No, the Aln/Alen is obsolete. It was officially replaced by the meter in Sweden, Denmark, and Norway during the metrication process in the late 19th and early 20th centuries. Its use today is purely historical.
Is the Aln an SI unit?
No, the Aln/Alen is not an SI unit. It is a traditional unit from the historical Scandinavian systems of measurement. The SI base unit for length is the meter (m).
Conversion Table: Centimeter to Aln
| Centimeter (cm) | Aln (aln) |
|---|---|
| 0.5 | 0.008 |
| 1 | 0.017 |
| 1.5 | 0.025 |
| 2 | 0.034 |
| 5 | 0.084 |
| 10 | 0.168 |
| 25 | 0.421 |
| 50 | 0.842 |
| 100 | 1.684 |
| 250 | 4.209 |
| 500 | 8.418 |
| 1,000 | 16.835 |
People Also Ask
How do I convert Centimeter to Aln?
To convert Centimeter to Aln, enter the value in Centimeter 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 Centimeter to Aln?
The conversion factor depends on the specific relationship between Centimeter and Aln. 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 Aln back to Centimeter?
Yes! You can easily convert Aln back to Centimeter by using the swap button (⇌) in the calculator above, or by visiting our Aln to Centimeter converter page. You can also explore other length conversions on our category page.
Learn more →What are common uses for Centimeter and Aln?
Centimeter and Aln 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:
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- Kilometer (km) • Centimeter to Kilometer
- Hectometer (hm) • Centimeter to Hectometer
- Decimeter (dm) • Centimeter to Decimeter
- Millimeter (mm) • Centimeter to Millimeter
- Inch (in) • Centimeter to Inch
- Foot (ft) • Centimeter to Foot
- Yard (yd) • Centimeter to Yard
- Mile (mi) • Centimeter to Mile
- Nautical Mile (NM) • Centimeter 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: February 19, 2026