Paka Porta Calculator: Complete Guide & Calculation Rules
What is Paka Porta in Bangladesh Bullion Trading?
In the wholesale bullion markets of Old Dhaka's historic Tanti Bazar and retail showrooms affiliated with the Bangladesh Jewellers Association (BAJUS), Paka Porta (পাকা পরতা) is the foundational valuation metric. The term literally translates to "solid cost" or "purified rate." It denotes the exact monetary value of the net pure gold contained within an ornament or bar, calculated strictly in proportion to 24 Karat fine gold.
Pure 24 Karat gold is too soft (Mohs hardness of 2.5) to hold intricate gemstone settings or withstand daily wear without warping. To craft durable rings, necklaces, and bangles, master artisans melt pure gold with alloying metals such as copper and silver to produce 22 Karat (91.67% gold), 21 Karat (87.50% gold), or 18 Karat (75.00% gold). Paka porta strips away all external retail overhead, craftsmanship fees, and government taxes to expose the unadulterated baseline value of the precious metal.
Paka porta represents the unvarnished metal worth alone. It never includes showroom air-conditioning, marketing markup, or retail inventory premiums.
Artisans and wholesale bullion dealers rely on paka porta when issuing raw gold bars or casting sheets to jewelry workshops for production orders.
When customers liquidate old hallmarked jewelry for instant cash, the mandatory 18% BAJUS buy-back deduction is calculated directly against the paka porta rate.
The Mathematical Formula for Paka Porta Calculation
The mathematical logic governing paka porta relies on direct fractional purity. Because 24 Karat represents 100% theoretical purity (24 parts out of 24), any target karat is expressed as a simple fraction of that baseline:
| Target Karat | Purity Fraction | Hallmark Fineness | Alloy Proportion | Formula Breakdown |
|---|---|---|---|---|
| 22 Karat | 22 ÷ 24 = 91.67% | 916 Hallmark | 8.33% Copper & Silver | 24K Base × 0.91667 |
| 21 Karat | 21 ÷ 24 = 87.50% | 875 Hallmark | 12.50% Copper & Silver | 24K Base × 0.87500 |
| 18 Karat | 18 ÷ 24 = 75.00% | 750 Hallmark | 25.00% Base Alloys | 24K Base × 0.75000 |
| 14 Karat | 14 ÷ 24 = 58.33% | 585 Hallmark | 41.67% Base Alloys | 24K Base × 0.58333 |
| Sanatan (Traditional) | Varies (roughly 50% to 65%) | Non-hallmarked | Variable Alloy Mix | Assay Fire Test Required |
The Traditional 960-Point System Explained
A frequent source of confusion among contemporary gold buyers is the point unit. While modern digital balances divide one vori into 100 or 1,000 decimal parts, traditional goldsmiths across South Asia operate under the duodecimal 960-point scale. Understanding this relationship guarantees you are never shortchanged on micro-weights:
| Sub-Unit Name | Vori Equivalent | Points in 960 Scale | Metric Gram Weight | Common Usage |
|---|---|---|---|---|
| 1 Vori (Bhori) | 1.000 Vori | 960 Points | 11.6638 grams | Bullion bars, heavy necklaces, bridal sets |
| 1 Ana | 1 ÷ 16 Vori | 60 Points | 0.7289 grams | Gold rings, light earrings, chains |
| 1 Roti | 1 ÷ 96 Vori | 10 Points | 0.1215 grams | Nose pins, gemstone mountings, delicate filigree |
| 1 Point (Traditional) | 1 ÷ 960 Vori | 1 Point | 0.01215 grams | Micro craftsmanship adjustment and solder joints |
| 1 Decimal Point (Digital) | 1 ÷ 100 Vori | 9.6 Traditional Points | 0.11664 grams | Digital balance decimal readout (e.g. 1.15 vori) |
Paka Porta vs Showroom Retail Invoicing
A frequent misunderstanding among consumers is expecting jewelry showroom cash memos to match the bare paka porta calculation. In reality, paka porta is merely the raw metal component of a retail purchase:
Covers exclusively the market value of the gold element. No artisan fees, showroom display expenses, or government tariffs are added. This is the valuation used between goldsmiths and wholesale bullion cast houses.
Represents the legally compliant final receipt paid by retail consumers across Bangladesh. Includes the paka porta metal cost, statutory minimum craftsmanship charge of ৳3,499 per vori mandated by BAJUS, and 5% NBR VAT.
Tanti Bazar Tejabi Rate vs BAJUS Showroom Benchmark
When checking 24 Karat gold prices in Dhaka, you will encounter two primary figures:
Announced publicly by the Bangladesh Jewellers Association executive committee. This is the consumer benchmark applied across all branded retail jewelry showrooms in Dhaka, Chattogram, Sylhet, and other major districts.
The spot liquidation rate for recycled, melted, and refined raw bullion bars in Old Dhaka's bullion hub. Because this market caters to high-volume trade liquidity without showroom overhead, Tejabi gold frequently trades 5% to 8% lower than consumer retail benchmark prices.
How to Use This Paka Porta Calculator Terminal
Enter the current 24K pure gold price per vori from today's live BAJUS quote or wholesale Tanti Bazar ticker.
Pick 22K (916), 21K (875), 18K (750), 14K (585), or specify custom fineness for precise proportional scaling.
Input your bullion weight using traditional Vori, Ana, Roti, and Points, or switch to decimal Grams seamlessly.
View exact paka porta per vori, point value rate, total raw metal price, and showroom bill estimate with making charge and VAT.
Complementary Bullion Tools & Calculators
Cross-reference your paka porta estimates with our suite of specialized precious metal calculators:
All paka porta mathematical equations and unit conversion factors follow the official guidelines of the Bangladesh Jewellers Association (BAJUS) and trade conventions established in Tanti Bazar, Old Dhaka. Curated and mathematically audited by Senior Bullion Analyst Mehedi Hasan.
