All guides
Twenty plain-English explainers on the money and health math behind the calculators — formulas, worked examples and FAQs in every one.
EMI Explained: The Complete Home Loan Guide
Understand how home loan EMIs work: the formula, amortization, and smart ways to pay less interest over the life of your loan.
5 min read InvestingSIP vs Lump Sum: Which Builds More Wealth?
SIP or lump sum? We compare both strategies with numbers — when steady investing wins, when lump sum wins, and how to choose.
4 min read InvestingHow Compound Interest Works (With Examples)
Compound interest explained with real numbers: the formula, the rule of 72, and why starting early beats investing more later.
4 min read HealthBMI Chart Explained: Categories and What They Mean
Decode the BMI chart: all four categories, healthy weight ranges by height, and what the chart can't tell you about your health.
3 min read Everyday mathHow to Calculate Percentage Increase: Step-by-Step
Learn the percentage increase formula with worked examples — salary raises, price hikes, and growth rates, plus common mistakes.
3 min read LoansPersonal Loan Interest: A Complete Guide
How personal loan interest works: rates, fees, reducing balance vs flat, and how to find the true cost before you sign.
4 min read InvestingRetirement Savings Math: How Much Do You Need?
Do the retirement math yourself: the 25x rule, the 4% rule, and how monthly savings compound into a retirement corpus.
3 min read BudgetingThe 50/30/20 Budget Rule Explained
Split your after-tax income into needs, wants and savings with the 50/30/20 rule. Real examples, tweaks, and when to break it.
3 min read CreditCredit Score Basics: What It Is and How to Improve It
What a credit score is, the five factors behind it, and proven steps to raise your score — plus myths to ignore.
3 min read LoansFlat vs Reducing Balance Interest: The Real Difference
Flat-rate and reducing-balance interest can double your cost. Learn the difference with side-by-side numbers before you borrow.
3 min read LoansHow Much House Can I Afford? A Simple Formula
A practical affordability formula: the 28/36 rule, down payment math, and hidden costs — with worked examples.
4 min read BudgetingEmergency Fund: How Much to Save and Why
How big should your emergency fund be? The 3–6 month rule, how to calculate your number, and where to keep it.
3 min read LoansLoan Tenure vs EMI: The Trade-Off That Costs Thousands
Longer tenure, smaller EMI — but far more interest. See the trade-off with real numbers and find your sweet spot.
4 min read LoansAPR vs Interest Rate: What's the Difference?
APR includes fees; the interest rate doesn't. Learn what APR really tells you and how to compare loan offers correctly.
3 min read Everyday mathSalary Raise Percentages: How to Calculate and Negotiate
Calculate your raise as a percentage, adjust for inflation to find the real raise, and use the numbers in negotiation.
3 min read Everyday mathDiscount Math: Percentage Off and Sale Prices
Master sale math: percentage-off prices, stacked discounts, and the tricks stores use — never overpay again.
3 min read Everyday mathHow to Compute a Tip Quickly: Mental Math Tricks
Fast mental-math tricks for 10%, 15% and 20% tips — plus how to split the bill fairly every time.
4 min read HealthBMI for Children and Teens: Percentiles Explained
Kids' BMI works differently: it's about percentiles, not cutoffs. Learn how to read a BMI-for-age chart correctly.
3 min read HealthBody Fat Percentage vs BMI: Which Matters More?
BMI vs body fat percentage: what each measures, healthy ranges for men and women, and which to track.
3 min read LoansMortgage Overpayments: How Extra Payments Save Thousands
Paying a little extra each month can shave years off your mortgage. See the math and the smartest overpayment strategy.
3 min read