Bigha to Katha (Patna) Converter
1 Bigha = 20 Katha (Patna) in Bihar
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Whether you are verifying a Khasra entry, comparing plot quotes, or preparing a sale deed, you need a reliable Bigha to Katha (Patna) conversion. Bihar has its own recognised Bigha size, which is why generic online converters often return the wrong number. Below, our live calculator is pre-set to this exact pair for Bihar, and every value in the tables is computed from the same single source of truth — not copied from random blogs.
Understanding Bigha and Katha (Patna)
Bigha is a traditional land measure whose size is defined at the state level — not by central law. That is why two sellers quoting "1 Bigha" in different states may describe plots differing by a factor of three or four. Converting into Katha (Patna) requires knowing which district or regional standard applies, especially in Bihar, West Bengal, and eastern UP. BhumiMeter never guesses these numbers — every factor on this page is read from our curated data tables and computed through a square-foot base unit, the same method used internally by revenue surveyors when cross-checking Khasra maps.
Before you buy or sell — quick checklist
1. Punjab and Haryana listings sometimes mix Kanal-Marla with Bigha — confirm the hierarchy before converting. 2. Ask the seller which Bigha standard they mean — "Bigha" alone is not enough in most of North India. 3. Compare the quoted area with the measurement on your online Bhulekh / Apna Khata / Banglarbhumi extract (usually stored in square metres). 4. For RERA-registered flats, carpet area is disclosed in square feet by convention even though the legal unit is square metre — convert both ways before comparing builder quotes.
Quick Reference Table
Common Bigha values converted to Katha (Patna) (Bihar standard).
| Bigha | Katha (Patna) |
|---|---|
| 1 | 20 |
| 2 | 40 |
| 5 | 100 |
| 10 | 200 |
| 50 | 1,000 |
| 100 | 2,000 |
Conversion Formula
Katha (Patna) = Bigha × (27,225 sq ft ÷ 1,361.25 sq ft per Katha (Patna)). Equivalently: multiply by 20. All factors come from BhumiMeter's data tables — square foot is the internal base unit.
Worked Example
Example: You have a plot measuring 5 Bigha. Multiply by the conversion factor: 5 × 20 = 100 Katha (Patna). Reverse check: 100 Katha (Patna) ÷ 20 = 5 Bigha.
Bihar — local context
Bihar land records and broker quotes rely on state-specific units. Key values on BhumiMeter: Bigha: 27,225 sq ft; Katha (Patna): 1,361.25 sq ft; Biswa: 1,361.25 sq ft. Bihar uses a 20-katha Bigha (27,225 sq ft at Patna standard) but Katha itself varies by district — Muzaffarpur and West Champaran use different sizes. Check the district on your land record. These figures are indicative — confirm against your Khasra-Khatauni or state Bhulekh portal before any financial decision.
Frequently Asked Questions
How many Katha (Patna) are in 1 Bigha in Bihar?
1 Bigha = 20 Katha (Patna). This is computed from BhumiMeter's verified tables — not scraped from third-party blogs. For property due diligence, match this figure against your sale agreement and the area recorded on the government portal. If the numbers diverge by more than a few percent, pause and ask which local variant (Pucca/Kachha Bigha, 5-biswa vs 20-biswa, etc.) the other party is using before proceeding.
Is Bigha the same in every state of India?
No. Bigha is a traditional unit whose size varies by state — and sometimes by district. That is exactly why BhumiMeter asks you to pick a state. Fixed units like square foot, acre, and Gaj (square yard) are uniform nationwide.
Can I use this conversion for legal land registration?
Use these figures as a starting point only. Government land records store area in square metres/hectares; local brokers may quote Bigha or Gaj. Always cross-check with your sale deed, Bhulekh/Khasra extract, and the tehsildar office before paying token money or signing.
What is the formula to convert Bigha to Katha (Patna)?
Katha (Patna) = Bigha × (27,225 sq ft ÷ 1,361.25 sq ft per Katha (Patna)). Equivalently: multiply by 20. All factors come from BhumiMeter's data tables — square foot is the internal base unit.
Which Bigha standard does this page use for Bihar?
Bihar land records and broker quotes rely on state-specific units. Key values on BhumiMeter: Bigha: 27,225 sq ft; Katha (Patna): 1,361.25 sq ft; Biswa: 1,361.25 sq ft. Bihar uses a 20-katha Bigha (27,225 sq ft at Patna standard) but Katha itself varies by district — Muzaffarpur and West Champaran use different sizes. Check the district on your land record. These figures are indicative — confirm ag… Use the live calculator above to switch variants where multiple standards exist.