Convert Square Perch to Acre
Convert square perches to acres instantly. 1 square perch = 0.00625 acre — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Acre to Square Perch converter for the reverse conversion.
Units explained
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
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 to Acre conversion formula
The relationship between square perches and acres:
To convert square perches to acres, multiply the value in square perches by 0.00625. To reverse, multiply acres by 160.
How to use this converter
Type a value into the calculator. The result in acres updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Acre to Square Perch converter for the reverse direction.
Step-by-step: convert square perches to acres
- Write down the value in square perches (perch²).
- Multiply that value by the factor 0.00625.
- The product is the equivalent value in acres (ac).
- To reverse, multiply the acre value by 160.
Worked examples
Example 1 — Convert 1 perch² to ac:
1 × 0.00625 = 0.00625 ac
Example 2 — Convert 100 perch² to ac:
100 × 0.00625 = 0.625 ac
Square Perch to Acre conversion table
Standard reference values for converting square perches to acres:
| Square Perch [perch²] | Acre [ac] |
|---|---|
| 0.01 | 6.25e-5 |
| 0.1 | 0.000625 |
| 1 | 0.00625 |
| 2 | 0.0125 |
| 3 | 0.01875 |
| 4 | 0.025 |
| 5 | 0.03125 |
| 10 | 0.0625 |
| 20 | 0.125 |
| 30 | 0.1875 |
| 40 | 0.25 |
| 50 | 0.3125 |
| 100 | 0.625 |
| 500 | 3.125 |
| 1000 | 6.25 |
Frequently asked questions
How many acres is 1 square perch?
How do I convert square perches to acres?
How do I convert acres back to square perches?
How many acres is 100 square perches?
Popular area unit conversions
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Metric / SI (5 units)
Imperial / US Customary (14 units)
Sources & references
Conversion factor (1 perch² = 0.00625 ac) 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.