Convert Acre to Square Perch
Convert acres to square perches instantly. 1 acre = 160 square perch — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Perch to Acre converter for the reverse conversion.
Units explained
Acre
An acre is an imperial unit of area equal to exactly 4046.8564224 m². It is the most widely used non-metric unit for land area, particularly in the US, UK, and India.
Originally defined in medieval England as the area one yoke of oxen could plow in a day, approximately 40 perches by 4 perches. Standardized via the 1959 International Yard and Pound Agreement.
Acres are the standard land measurement unit in the US (real estate, agriculture), the UK (rural property), and widely used in India (alongside hectares and traditional regional units). 1 acre = 4840 sq yd = 43,560 sq ft = 0.4047 hectare.
Medieval English farming origin; modern exact value standardized in 1959.
Square Perch
A square perch is identical to a square rod, equal to approximately 25.293 m². 'Perch' is the older English regional name for the same unit.
Identical in value to square rod and square pole; differs only in regional naming preference. 'Perch' is more commonly used in British and Irish historical contexts.
Square perches survive in some historical British property records, particularly in Ireland where the unit had legal status until the metric transition.
Standardized via the 1959 International Yard and Pound Agreement.
Acre to Square Perch conversion formula
The relationship between acres and square perches:
To convert acres to square perches, multiply the value in acres by 160. To reverse, multiply square perches by 0.00625.
How to use this converter
Type a value into the calculator. The result in square 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 Square Perch to Acre converter for the reverse direction.
Step-by-step: convert acres to square perches
- Write down the value in acres (ac).
- Multiply that value by the factor 160.
- The product is the equivalent value in square perches (perch²).
- To reverse, multiply the square perch value by 0.00625.
Worked examples
Example 1 — Convert 1 ac to perch²:
1 × 160 = 160 perch²
Example 2 — Convert 100 ac to perch²:
100 × 160 = 16000 perch²
Real-world example — Endurance race distances
A 50-acre cycling or running race converts to a recognizable distance in square perches. Endurance athletes coming from a different measurement system use this conversion to compare training plans across regions.
50 ac × 160 = 8000 perch²
Real-world example — Maritime exclusion zone
A 200-acre exclusion zone (a common maritime boundary) converts to a different value in square perches that's useful when describing the same zone in everyday land-distance units.
200 ac × 160 = 32000 perch²
Real-world example — Coastal cruise distances
A 10-acre coastal sailing route converts to a different value in square perches — useful for cruise operators who switch between maritime, aviation, and road-distance units depending on the leg of the trip.
10 ac × 160 = 1600 perch²
Acre to Square Perch conversion table
Standard reference values for converting acres to square perches:
| Acre [ac] | Square Perch [perch²] |
|---|---|
| 0.01 | 1.6 |
| 0.1 | 16 |
| 1 | 160 |
| 2 | 320 |
| 3 | 480 |
| 4 | 640 |
| 5 | 800 |
| 10 | 1600 |
| 20 | 3200 |
| 30 | 4800 |
| 40 | 6400 |
| 50 | 8000 |
| 100 | 16000 |
| 500 | 80000 |
| 1000 | 160000 |
Frequently asked questions
How many square perches is 1 acre?
How do I convert acres to square perches?
How do I convert square perches back to acres?
How many square perches is 100 acres?
Popular area unit conversions
Convert Acre to other area units
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Metric / SI (16 units)
Imperial / US Customary (14 units)
US Survey (5 units)
Indian Subcontinent (16 units)
Other Regional (10 units)
Scientific / Physics (5 units)
Historical / Pre-metric European (6 units)
Sources & references
Conversion factor (1 ac = 160 perch²) 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.