Convert Inch to Perch
Convert inches to perches instantly. 1 inch = 0.0050505051 perch — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Perch to Inch converter for the reverse conversion.
Units explained
Inch
An inch is an Imperial and US customary unit of length defined since 1959 as exactly 25.4 millimeters (0.0254 meters). It is still the standard small unit of length in the United States, the United Kingdom (informally), and a few other countries.
The inch derives from the Roman uncia (one-twelfth of a foot) and survived through Anglo-Saxon and medieval English measurement systems. Various definitions persisted regionally until the 1959 International Yard and Pound Agreement standardized the inch globally as exactly 25.4 mm.
Inches are used in the US and UK for body height, screen sizes (TVs, monitors, phones), tire sizes, plumbing, lumber, paper sizes (US Letter is 8.5 × 11 in), and most consumer product specifications in the United States.
Anglo-Saxon origin (predating 1066); standardized to 25.4 mm exactly by the International Yard and Pound Agreement of 1959, signed by the US, UK, Canada, Australia, New Zealand, and South Africa.
Perch
A perch is an Imperial unit of length identical to the rod — 16.5 feet (about 5.03 m). The names 'rod', 'perch', and 'pole' all refer to the same surveying unit and differ only by regional preference.
Like the rod, the perch derives from medieval English land-surveying. The name 'perch' was particularly common in legal land descriptions in Ireland and parts of the UK.
Perches appear in legacy land descriptions in Ireland, the UK, and historical US documents. Modern usage is rare.
Medieval English surveying origin; identical to the rod since 1620; became exact via the 1959 International Yard and Pound Agreement.
Inch to Perch conversion formula
The relationship between inches and perches:
To convert inches to perches, multiply the value in inches by 0.0050505051. To reverse, multiply perches by 198.
How to use this converter
Type a value into the calculator. The result in perches updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Perch to Inch converter for the reverse direction.
Step-by-step: convert inches to perches
- Write down the value in inches (in).
- Multiply that value by the factor 0.0050505051.
- The product is the equivalent value in perches (perch).
- To reverse, multiply the perch value by 198.
Worked examples
Example 1 — Convert 1 in to perch:
1 × 0.0050505051 = 0.0050505051 perch
Example 2 — Convert 100 in to perch:
100 × 0.0050505051 = 0.5050505051 perch
Real-world example — Furniture and large objects
A 72-inch piece of furniture converts to a value in perches 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 in × 0.0050505051 = 0.3636363636 perch
Real-world example — Children's height milestones
A 150-inch-tall child measures a value in perches that's commonly used for theme-park ride height requirements when travelling between countries that use different measurement units.
150 in × 0.0050505051 = 0.7575757576 perch
Real-world example — Body height conversion
You enter your height as 180 inches into an international job or visa application. The form then asks for the same value in perches — converting between these adjacent units is one of the most-used length conversions globally.
180 in × 0.0050505051 = 0.9090909091 perch
Inch to Perch conversion table
Standard reference values for converting inches to perches:
| Inch [in] | Perch [perch] |
|---|---|
| 0.01 | 5.050505e-5 |
| 0.1 | 0.0005050505 |
| 1 | 0.0050505051 |
| 2 | 0.0101010101 |
| 3 | 0.0151515152 |
| 4 | 0.0202020202 |
| 5 | 0.0252525253 |
| 10 | 0.0505050505 |
| 20 | 0.101010101 |
| 30 | 0.1515151515 |
| 40 | 0.202020202 |
| 50 | 0.2525252525 |
| 100 | 0.5050505051 |
| 500 | 2.5252525253 |
| 1000 | 5.0505050505 |
Frequently asked questions
How many perches is 1 inch?
How do I convert inches to perches?
How do I convert perches back to inches?
How many perches is 100 inches?
Popular length unit conversions
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Metric / SI (18 units)
Imperial / US Customary (26 units)
Nautical (1 units)
Astronomical (9 units)
Atomic / Physics (6 units)
Typographic (3 units)
Sources & references
Conversion factor (1 in = 0.0050505051 perch) 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.