Convert Acre to Bigha (Kachha, North India)
Convert acres to bighas instantly. 1 acre = 4.0134245955 bigha (kachha, north india) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Bigha (Kachha, North India) 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.
Bigha (Kachha, North India)
A kachha (smaller) bigha is a traditional unit of land area used in North India, equal to approximately 1008 m² (about 0.25 acre). Used alongside the pucca bigha in Uttar Pradesh and Bihar.
The 'kachha' (raw or smaller) bigha is exactly one-third the size of the pucca bigha. Both units coexist in regional usage.
Kachha bighas appear in informal property descriptions and traditional land records in Uttar Pradesh and Bihar. Modern legal documents typically use hectares or pucca bighas with explicit conversion.
Traditional unit; relationship to pucca bigha standardized as 1:3.
Acre to Bigha (Kachha, North India) conversion formula
The relationship between acres and bighas:
To convert acres to bighas, multiply the value in acres by 4.0134245955. To reverse, multiply bighas by 0.2491637693.
How to use this converter
Type a value into the calculator. The result in bighas updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Bigha (Kachha, North India) to Acre converter for the reverse direction.
Step-by-step: convert acres to bighas
- Write down the value in acres (ac).
- Multiply that value by the factor 4.0134245955.
- The product is the equivalent value in bighas (bigha).
- To reverse, multiply the bigha (kachha, north india) value by 0.2491637693.
Worked examples
Example 1 — Convert 1 ac to bigha:
1 × 4.0134245955 = 4.0134245955 bigha
Example 2 — Convert 100 ac to bigha:
100 × 4.0134245955 = 401.3424595519 bigha
Real-world example — Endurance race distances
A 50-acre cycling or running race converts to a recognizable distance in bighas. Endurance athletes coming from a different measurement system use this conversion to compare training plans across regions.
50 ac × 4.0134245955 = 200.671229776 bigha
Real-world example — Maritime exclusion zone
A 200-acre exclusion zone (a common maritime boundary) converts to a different value in bighas that's useful when describing the same zone in everyday land-distance units.
200 ac × 4.0134245955 = 802.6849191039 bigha
Real-world example — Coastal cruise distances
A 10-acre coastal sailing route converts to a different value in bighas — useful for cruise operators who switch between maritime, aviation, and road-distance units depending on the leg of the trip.
10 ac × 4.0134245955 = 40.1342459552 bigha
Acre to Bigha (Kachha, North India) conversion table
Standard reference values for converting acres to bighas:
| Acre [ac] | Bigha (Kachha, North India) [bigha] |
|---|---|
| 0.01 | 0.040134246 |
| 0.1 | 0.4013424596 |
| 1 | 4.0134245955 |
| 2 | 8.026849191 |
| 3 | 12.0402737866 |
| 4 | 16.0536983821 |
| 5 | 20.0671229776 |
| 10 | 40.1342459552 |
| 20 | 80.2684919104 |
| 30 | 120.4027378656 |
| 40 | 160.5369838208 |
| 50 | 200.671229776 |
| 100 | 401.3424595519 |
| 500 | 2006.7122977597 |
| 1000 | 4013.4245955193 |
Frequently asked questions
How many bighas is 1 acre?
How do I convert acres to bighas?
How do I convert bighas back to acres?
How many bighas 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 = 4.0134245955 bigha) 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.