Convert Perch to Chain
Convert perches to chains instantly. 1 perch = 0.25 chain — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Chain to Perch converter for the reverse conversion.
Units explained
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.
Chain
A chain is an Imperial unit of length equal to 66 feet (20.1168 m), or exactly 4 rods or 100 links. It is the central unit in the Gunter chain-based land-survey system.
Defined by Edmund Gunter in 1620 specifically to make land-area arithmetic easy: 10 square chains = 1 acre exactly. The 66-foot length and 100-link subdivision were chosen so chain measurements could be added decimally.
Chains are the fundamental unit of legacy US public land surveys (the entire US township-and-range system uses chains). Modern survey work generally uses meters or feet, but legacy deeds remain in chains.
Invented by Edmund Gunter in 1620; standardised throughout English and American land survey; became exact via the 1959 International Yard and Pound Agreement.
Perch to Chain conversion formula
The relationship between perches and chains:
To convert perches to chains, multiply the value in perches by 0.25. To reverse, multiply chains by 4.
How to use this converter
Type a value into the calculator. The result in chains updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Chain to Perch converter for the reverse direction.
Step-by-step: convert perches to chains
- Write down the value in perches (perch).
- Multiply that value by the factor 0.25.
- The product is the equivalent value in chains (ch).
- To reverse, multiply the chain value by 4.
Worked examples
Example 1 — Convert 1 perch to ch:
1 × 0.25 = 0.25 ch
Example 2 — Convert 100 perch to ch:
100 × 0.25 = 25 ch
Real-world example — Maritime depth conversion
A 10-perch sounding depth converts cleanly into chains. Recreational divers and sailors translate between the two units whenever they read legacy charts against modern depth-sounder displays.
10 perch × 0.25 = 2.5 ch
Real-world example — Reference scenario in case of fallback
Conversion between human-scale length units is the everyday workflow of architecture, athletics, and apparel design — three of the most common contexts that span metric and imperial systems.
1 perch × 0.25 = 0.25 ch
Real-world example — Adult height conversion
A 1.8-perch-tall person measures a value in chains that converts the height to the unit favoured by American forms, schools, or driver's licences. This is daily routine for anyone living between metric and imperial systems.
1.8 perch × 0.25 = 0.45 ch
Perch to Chain conversion table
Standard reference values for converting perches to chains:
| Perch [perch] | Chain [ch] |
|---|---|
| 0.01 | 0.0025 |
| 0.1 | 0.025 |
| 1 | 0.25 |
| 2 | 0.5 |
| 3 | 0.75 |
| 4 | 1 |
| 5 | 1.25 |
| 10 | 2.5 |
| 20 | 5 |
| 30 | 7.5 |
| 40 | 10 |
| 50 | 12.5 |
| 100 | 25 |
| 500 | 125 |
| 1000 | 250 |
Frequently asked questions
How many chains is 1 perch?
How do I convert perches to chains?
How do I convert chains back to perches?
How many chains is 100 perches?
Popular length unit conversions
Convert Perch to other length units
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Metric / SI (4 units)
Imperial / US Customary (26 units)
Sources & references
Conversion factor (1 perch = 0.25 ch) 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.