Convert Pole to Chain
Convert poles to chains instantly. 1 pole = 0.25 chain — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Chain to Pole converter for the reverse conversion.
Units explained
Pole
A pole is an Imperial unit of length identical to the rod and perch — 16.5 feet (about 5.03 m). The names are regional and historical variants for the same measurement.
The pole derives from medieval English land-surveying. The name comes from the physical wooden pole used by surveyors to lay out the unit on the ground.
Poles appear in historical land records, particularly older US public-land surveys. Functionally identical to rod and perch in all calculations.
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.
Pole to Chain conversion formula
The relationship between poles and chains:
To convert poles to chains, multiply the value in poles 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 Pole converter for the reverse direction.
Step-by-step: convert poles to chains
- Write down the value in poles (pole).
- 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 pole to ch:
1 × 0.25 = 0.25 ch
Example 2 — Convert 100 pole to ch:
100 × 0.25 = 25 ch
Real-world example — Fabric purchase length
Two poles of fabric equals a value in chains essential for tailors and textile buyers sourcing material from international suppliers that quote in different units.
2 pole × 0.25 = 0.5 ch
Real-world example — Maritime depth conversion
A 10-pole 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 pole × 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 pole × 0.25 = 0.25 ch
Pole to Chain conversion table
Standard reference values for converting poles to chains:
| Pole [pole] | 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 pole?
How do I convert poles to chains?
How do I convert chains back to poles?
How many chains is 100 poles?
Popular length unit conversions
Convert Pole to other length units
Show all Pole conversions
Metric / SI (4 units)
Imperial / US Customary (26 units)
Sources & references
Conversion factor (1 pole = 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 Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.