Practical Guides — Finance, Health & More
Plain-language articles on electricity bills, income tax, CNG/LPG fuel costs, construction, solar energy, pregnancy, heart rate training and everyday financial decisions — written with real numbers and verified sources.
Md. Qamrul Hassan
Software Engineer & CostNest Founder
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CNG vs LPG vs Petrol: Full Cost Comparison for Bangladesh Cars (2026)
A detailed, number-driven comparison of CNG, auto LPG, and petrol fuel costs for Bangladeshi drivers — with real per-km cost calculations, break-even analysis, and a verdict on which fuel saves the most money.
How to Calculate CNG Fill Cost in Bangladesh — Step-by-Step Guide
Learn exactly how to calculate how much a CNG fill costs in Bangladesh — from cylinder capacity to usable kg, fill cost formula, safe fill level, and how to estimate your refuelling frequency.
LPG Cylinder vs Auto LPG: Which Is Cheaper for Your Car in Bangladesh?
A practical comparison of household LPG cylinders versus auto LPG pumps for vehicle use in Bangladesh — covering price per kg, safety, conversion kit requirements, and total cost of ownership.
CNG Conversion Kit Cost & Break-Even Analysis for Bangladesh Cars (2026)
How much does a CNG conversion kit cost in Bangladesh? Which kit type suits your engine? Full break-even calculator with worked examples showing how long it takes to recover the conversion cost at current petrol and CNG prices.
How Far Can Your Car Travel on CNG? Range & Mileage Guide for Bangladesh
A practical guide to CNG vehicle range in Bangladesh — how to calculate km per kg, what affects CNG mileage, typical range by car size, and how to improve your CNG fuel economy.
Sewing Thread Consumption Calculation: A Complete Guide for Garment Merchandisers
Learn how to calculate sewing thread consumption in the garment industry. Understand stitch classes, SPI, thickness factors, wastage allowance, and pro tips to prevent factory shortages.
Property Registration Fees in Bangladesh 2026: A Complete Cost Breakdown
A detailed guide to land and apartment registration costs in Bangladesh — stamp duty, registration fee, local government tax, gain tax, VAT, and miscellaneous fees. Finance Act 2024 aligned.
Warp & Weft Yarn Consumption Calculation: A Complete Textile Engineering Guide
Learn how to calculate warp yarn weight, weft yarn weight, and fabric GSM for woven fabric orders. Covers EPI/PPI, Ne/Tex/Denier conversion, crimp, waste factors. ASTM D3776 aligned.
TDS & VDS Calculation in Bangladesh: A Complete NBR Withholding Tax Guide (2026)
Understand how to calculate TDS and VDS on vendor invoices in Bangladesh. Covers NBR Income Tax Act 2023, TIN status impact, Mushak 6.3, deposit deadlines, return filing, and worked examples.
Prepaid Electricity Meter Charges in Bangladesh: A Complete Recharge and Slab Guide (2026)
Learn how prepaid electricity meter recharges are calculated in Bangladesh. Understand fixed charges (meter rent, demand charge), NBR taxes, BERC slab tariffs, and tips to maximize units.
Apparel Export Carton Box Sizing, CBM, and GSM Calculation: Merchandiser Guide
A complete guide for apparel merchandisers to calculate carton CBM, volumetric shipping weights, empty carton weight based on board GSM, ply count, and total packaging cost.
L/C Opening Charges and Bank Commission in Bangladesh: Trade Finance Guide
A comprehensive guide to Letter of Credit (L/C) opening bank commissions, SWIFT charges, stamp duties, marine insurance cover notes, and NBR VAT rules for import and back-to-back L/Cs.
Lean Body Mass Explained — How to Calculate It and Why It Matters
What lean body mass is and how it differs from fat-free mass, the Boer, James and Hume formulas explained, how LBM is used for protein targets and drug dosing, and when to use body fat % instead of anthropometric formulas.
Washing Cost Per Piece in Bangladesh: How Washing Plants Calculate Their Rates
A practical breakdown of how garment washing plants in Bangladesh calculate cost per piece — covering labour, chemicals, water, steam, fuel, overhead, and ETP charges.
Heart Rate Training Zones Explained — From Recovery to VO₂ Max
How the five heart rate zones are defined, when to use the Karvonen formula versus the simple percentage method, what the 80/20 training principle means, and how to measure your resting and maximum heart rate accurately.
Line Efficiency in Bangladesh Garment Factories: How to Calculate and Improve It
What line efficiency means in RMG production, how to calculate it from SMV and minutes produced, what a realistic target looks like, and practical steps to improve a low-efficiency line.
How to Estimate Your 1RM and Use It to Structure Training
Why 1RM estimation matters for programming, which formula (Epley, Brzycki, Lombardi) to use for different rep ranges, how to build percentage-based training blocks, and why testing above 10 reps loses accuracy.
GSM in Fabric: What It Means and How to Calculate It
A complete guide to fabric GSM (grams per square metre) — how to measure it, how to calculate it from a sample, why it matters for garment costing, and common GSM ranges by fabric type.
Waist-to-Height Ratio: Why Half Your Height Is the Number to Know
How WHtR is calculated, why it outperforms BMI as a cardiometabolic risk screen, what the Ashwell & Hsieh boundaries mean, and how to measure your waist correctly for accurate results.
SAM and SMV in Garment Industry: How to Calculate Standard Allowed Minutes
What SAM and SMV mean in garment production, how Industrial Engineers calculate them from operation breakdown, and how SAM drives CM costing, manpower planning, and production targets.
Ovulation, Fertile Windows and the Luteal Phase — What the Numbers Really Mean
How ovulation timing is calculated from cycle length and the luteal phase, why the fertile window is 6 days not 1, what the luteal phase is and how to measure it, and how OPKs and BBT tracking complement calendar methods.
Fabric Shrinkage in Garment Washing: How to Measure and Allow for It
How to measure warp and weft shrinkage after washing, calculate shrinkage percentage, and factor it into pattern making and fabric consumption to avoid costly production errors.
How Pregnancy Due Dates Are Calculated — and Why Yours May Shift
A plain-English explanation of Naegele's rule, how cycle length affects your EDD, why a first-trimester ultrasound often overrides the LMP date, and what the trimester milestones mean for prenatal care.
Manpower Planning for Garment Factories: How Many Operators Do You Need?
How to calculate the number of sewing operators needed to achieve a production target in a Bangladesh garment factory, using SAM, efficiency, working hours, and order quantity.
Capacity Planning for Garment Factories: Matching Orders to Production Ability
How garment factories in Bangladesh calculate monthly production capacity to accept the right volume of orders. Covers lines, shifts, working days, SAM, and efficiency in one integrated planning approach.
Boiler Fuel and Steam Consumption in Garment Washing Plants
How to estimate fuel consumption and cost for industrial boilers in garment washing plants. Covers steam requirement calculation, boiler efficiency, and fuel cost comparison for gas vs HFO.
Zakat and Nisab Calculation in Bangladesh: 2026 Guide
How to calculate Zakat on your wealth in Bangladesh. Covers current gold and silver Nisab values, eligible assets, deductible liabilities, and the 2.5% calculation method.
How VAT Works in Bangladesh: A Plain-Language Guide (2025-26)
Everything you need to know about Bangladesh VAT at 15%. Covers how NBR VAT is charged, which goods are exempt, the difference between inclusive and exclusive prices, and how to work out VAT backwards.
Yarn Count Systems Explained: Converting Between Ne, Nm, Tex and Denier
A practical guide to yarn count systems used in Bangladesh's textile industry. Explains Ne (English), Nm (metric), Tex, and Denier with conversion formulas and a ready-reference table.
Trip Cost Guide Bangladesh: Bus, Train, Launch and Flight Fares 2026
How to estimate and plan your travel budget for trips within Bangladesh. Covers current bus, train, launch, and domestic flight fare ranges, plus fuel cost for private vehicles.
How Much Water Should You Drink Per Day? A Guide for Bangladesh's Climate
Evidence-based daily water intake recommendations, how heat and activity in Bangladesh's climate increase requirements, signs of dehydration, and practical tips for drinking enough in a tropical environment.
Land Area Units in Bangladesh: Katha, Bigha, Decimal and More
Complete guide to Bangladeshi land measurement units. Explains Katha, Bigha, Decimal, Shotangsho, Acre and their conversion factors — with regional variations across Dhaka, Sylhet, Chittagong and Rajshahi.
GPA and CGPA in Bangladesh: SSC, HSC and University Scales Explained
How GPA is calculated for SSC, HSC and university in Bangladesh. Covers the 5.00 and 4.00 grade scales, letter grade to GPA conversion, and how to compute CGPA across multiple semesters.
TDEE and Calorie Targets for Weight Loss: A Practical Guide for Bangladesh
How Total Daily Energy Expenditure is calculated from BMR and activity level, how to set a calorie deficit for healthy weight loss, and practical food guidance for Bangladeshi dietary patterns.
Currency Exchange in Bangladesh: How BDT Rates Work and Where to Exchange
How BDT exchange rates are set in Bangladesh, the difference between bank rates and kerb market rates, where to exchange currency legally, and how to calculate conversions accurately.
House Construction Cost per Sqft in Bangladesh 2026
Cost breakdown for building a house in Bangladesh in 2026. Covers economy, standard, and premium grades with per sqft rates for materials and finishes.
Concrete Mix Ratios in Bangladesh: How Much Cement, Sand and Aggregate You Need
Guide to calculating cement, sand, and aggregate quantities for Bangladesh construction. Covers M15, M20, and M25 mix ratios, the wet-to-dry volume correction, and common mistakes.
Garment Costing in Bangladesh: How FOB Price and CM Are Calculated
A practical guide to garment costing for Bangladesh's RMG industry. Covers CM calculation, fabric cost, trimming, FOB price building, and common costing mistakes merchandisers make.
RAJUK Setback Rules and Buildable Area: How to Calculate Your Plot's Net Floor Space
How RAJUK setback requirements reduce your usable plot area, how FAR (Floor Area Ratio) determines total buildable floor space, and how to calculate the maximum permissible construction for your Dhaka plot.
How to Calculate Discounts and Spot a Good Deal in Bangladesh
How to calculate the actual sale price from a percentage discount, find what discount is being offered, reverse-calculate the original price, and compare deals during Bangladesh's sale seasons.
Solar Panel Installation Cost in Bangladesh 2026: What to Expect
Complete guide to solar panel costs in Bangladesh. Covers residential and commercial system sizes, installation prices, payback periods, and which brands are available locally.
BMI in Bangladesh: What Your Number Means and Its Limitations
How to calculate BMI, what the WHO and Asian-Pacific BMI categories mean, why BMI has limitations for South Asian populations, and more meaningful measures of healthy weight.
Internet Packages in Bangladesh 2026: ISP Comparison and Cost Guide
Current internet package prices from Carnival, Link3, Amber IT, BTCL, DOT and major ISPs in Bangladesh. How to compare bandwidth, FUP limits, and real-world cost per GB.
Salary Calculator Bangladesh: Understanding Your Take-Home Pay
How income tax, provident fund, and other deductions affect your actual take-home salary in Bangladesh. Includes worked examples for different salary levels.
Body Fat Percentage: How to Measure It at Home and What the Numbers Mean
How to calculate body fat percentage using the US Navy tape measurement method, what healthy body fat ranges look like for South Asian adults, and how body fat compares to BMI as a health indicator.
How to Calculate Your Electricity Bill in Bangladesh (2026 BERC Rates)
Step-by-step guide to calculating your BPDB/DPDC electricity bill using the June 2026 BERC slab rates. Includes worked examples, updated rate table, and tips to lower your monthly bill.
Income Tax Slab Rates Bangladesh 2025-26: NBR Rules Explained
Complete guide to Bangladesh income tax for 2025-26. Covers NBR slab rates, tax-free threshold, investment rebate, AIT, and minimum tax — with worked examples for salaried employees.
EMI Loan Calculator: How Banks Calculate Your Monthly Instalment in Bangladesh
Understand how banks in Bangladesh calculate EMI. Covers the reducing balance method, flat rate vs reducing rate, total interest calculation, and how to compare loan offers.
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