Tools
30 articles in this category.
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Free online tools for developers, writers and everyday life: the complete guide
A guide to all 29 free browser tools on this site, grouped by what you need to do, with what each one is for, when to use it, and why none of them needs an account or uploads your data.
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Numbers in words: lakh, crore, million, and how to write a cheque amount
How the Indian and international number systems name large numbers, how to write rupees and paise in words for cheques and invoices, and how to use the Number to Words Converter.
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BMI explained: formula, WHO and Asian cut-offs, and what BMI cannot tell you
How body mass index is calculated, the WHO categories and the lower cut-offs used for South Asian adults, how to find a healthy weight range for your height, and the limits of BMI.
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Discounts, margin and markup: how to price and how to compare offers
Why stacked discounts do not add up, the difference between margin and markup, how to price for a target margin, and how to use the Discount & Profit Margin Calculator as a shopper or a seller.
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How to calculate your exact age and the days between two dates
How age in years, months and days is counted, what happens with month ends and 29 February birthdays, how working days are counted, and how to use the Age & Date Difference Calculator.
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Percentages made easy: the four formulas and the Percentage Calculator
The four everyday percentage questions, percentage of a number, what percent, percentage change, and adding or removing a percentage, with worked examples and the traps that cause wrong answers.
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Fixed deposits vs recurring deposits: how interest and maturity are calculated
How FD and RD maturity values are worked out, the difference between cumulative and payout FDs, why an RD's first instalment earns the most, and worked examples with the FD & RD Calculator.
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New vs old tax regime in India: how the Income Tax Calculator compares them
How income tax is worked out under the new and old regimes for FY 2026-27, what the rebate, standard deduction, surcharge and cess do, and worked examples at several salaries.
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Compound interest explained: the formula, compounding frequency and the calculator
How compound interest differs from simple interest, what the formula means, how yearly, quarterly, monthly and daily compounding compare, and what effective annual rate tells you.
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How a SIP grows: the formula, step-up SIPs and the SIP Calculator
How a monthly SIP is estimated, what compounding does over 10, 15 and 20 years, why a yearly step-up changes the result so much, and what a calculator cannot promise about returns.
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How to calculate GST: add, remove, CGST, SGST and the GST Calculator
How to add GST to a price and take it out of a GST-inclusive price correctly, what CGST, SGST and IGST mean, why subtracting 18% gives the wrong answer, and examples at common rates.
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How EMI is calculated: the loan formula, worked examples and the EMI Calculator
The EMI formula explained step by step, a worked example for a home loan, how interest and principal change over time, and how tenure and rate affect the total you pay.