10 guides
Guides and tips
Clear, worked explanations of the maths behind loans, taxes, investing, health numbers, grades and online selling, each with a calculator to try your own figures.
LoansHow to Calculate EMI: Formula, Example and What It Really CostsLearn the EMI formula with a worked ₹10 lakh example, see how much interest you pay over 10, 15 and 20 years, and how prepayment cuts the total.
eBay sellingeBay Seller Fees Explained (2026): What eBay Takes From Each SaleA plain-English guide to eBay.com seller fees in 2026: final value fee, per-order fee, international fee and promoted listings, with worked examples.
MarketplacesAmazon vs Etsy vs eBay Fees: Where Does a Seller Keep More?We compare Amazon, Etsy and eBay seller fees on the same $30 item to see what each platform takes and what you keep, using their published 2026 rates.
HealthBMI vs BMR vs TDEE: What Each Number Means and How to Use ItBMI, BMR and TDEE explained simply: what each one measures, how it is calculated, a worked example and the limits you should keep in mind.
StudentsHow to Convert CGPA to Percentage (CBSE, Universities and Abroad)Convert CGPA to percentage the right way: the CBSE 9.5 rule, common university formulas, worked examples and what to write on job and visa forms.
InvestingSIP vs Lump Sum: Which Builds More Wealth Over 20 Years?Compare a ₹10,000 monthly SIP with a lump-sum investment over 20 years, see the maths behind both, the effect of step-up SIPs and when each makes sense.
TaxHow to Calculate GST: Add, Remove and Split CGST, SGST and IGSTStep-by-step GST calculation for India: add GST to a price, remove it from an inclusive amount, split CGST/SGST or IGST, with the current 5%, 18% and 40% slabs.
BusinessProfit Margin vs Markup: The Difference That Changes Your PricesMargin and markup are not the same. See the formulas, a worked example, a conversion table and how to price products to hit a target margin.
E-commerceHow to Price a Product to Sell Online (Without Losing Money on Fees)A practical method to price products for online stores and marketplaces: list every cost, include percentage fees and ads, set a target margin and test.
Money basicsCompound Interest and the Rule of 72, Explained With Real NumbersHow compound interest works, why compounding frequency matters, and how the rule of 72 estimates doubling time, with simple worked examples.