CalculatorOnline Blog
Clear, practical guides on loans, EMI, tax, savings and everyday maths – with worked examples you can check in our free calculators.
Gratuity Calculation Formula 2026: New Labour Code Rules, Examples and Tax
The 15/26 formula with worked examples, what the new Labour Code changed (50% wage rule and the 1-year rule), eligibility, government gratuity and the ₹20 lakh tax-free limit.
Read article TaxHRA Exemption in 2026-27: 8 Metro Cities, Formula, Examples and Rules
Eight cities now get the 50% HRA limit. The three-limit formula, examples with charts, how much tax you save, rent receipts, landlord PAN and the new regime.
Read article RetirementNPS Withdrawal Rules 2026: 80% Lump Sum, Annuity, Partial Withdrawal and Tax
PFRDA now lets private NPS subscribers take 80% as cash. What the new exit rules mean for your lump sum, pension and tax – with charts and examples.
Read article SavingsRD vs FD: Which Gives Better Returns in 2026?
Recurring deposit or fixed deposit? Interest compared for 1 to 10 years with charts, Post Office vs bank rates, tax and TDS, and a simple rule for choosing.
Read article Shopping MathsHow to Calculate Discount: Formulas, Double Discounts and Bank Offers
The discount formula, finding % off from two prices, why stacked discounts are smaller than they look, capped bank offers, BOGO maths and a Diwali sale checklist.
Read article Car LoansHow to Calculate Car Loan EMI: Formula, EMI Table and Tips (2026)
The EMI formula with an ₹8 lakh example, EMI tables for ₹5–15 lakh, 2026 car loan rates, the effect of tenure and down payment, the 20/4/10 rule and flat-rate traps.
Read article MoneyHow to Convert USD to INR: Exchange Rates, Card Markup, GST and TCS Explained
The conversion formula, mid-market vs bank and cash rates, buying and selling rates, card markup with GST, GST on forex, TCS and LRS limits, and tips for a better rate.
Read article Dates & AgeHow to Calculate Age from Date of Birth: Exact Age in Years, Months & Days
Step-by-step method with borrowing, worked examples, age in days and weeks, leap-year and month-end birthdays, exam cut-off dates and Excel DATEDIF formulas.
Read article InvestingCompound Interest Formula: How to Calculate Compound Interest with Examples
The A = P(1 + r/n)^nt formula with a ₹1 lakh example, yearly vs quarterly vs monthly compounding, compound vs simple interest, the Rule of 72 and Excel formulas.
Read article SalaryHow to Calculate In-Hand Salary from CTC: Components, Deductions & Examples
What CTC includes, every salary component and deduction, the in-hand formula, a 10 LPA worked example and take-home pay for 6, 10 and 15 LPA packages.
Read article InvestingHow to Calculate FD Interest: Formula, Maturity Amount, TDS & Examples
The quarterly compounding formula, a ₹1 lakh worked example, maturity table, 2026 FD rates, monthly payout FDs, TDS rules, premature penalties and DICGC insurance.
Read article InvestingHow SIP Returns Are Calculated: SIP Formula, Examples & Step-Up SIP
The SIP future value formula, a ₹10,000 × 20 years example, returns table, how much SIP you need for ₹1 crore, step-up SIP, XIRR and tax on SIP gains.
Read article HealthHow to Calculate Calories for Weight Loss: BMR, TDEE & Calorie Deficit
Calculate BMR with the Mifflin-St Jeor equation, turn it into TDEE with activity multipliers, set a 500 kcal deficit, split protein, carbs and fat, and avoid plateaus.
Read article HealthHow Much Water Should I Drink a Day? Daily Water Intake by Weight, Activity & Climate
EFSA and US guidelines, the 33 ml per kg formula with a weight chart, extra water for exercise and Indian summers, pregnancy needs, dehydration signs and easy tips.
Read article HealthHow to Calculate Your Pregnancy Due Date (EDD): Naegele's Rule, Weeks & Trimesters
Naegele's rule with a worked example, adjusting for cycle length, conception and IVF dates, dating scans, counting pregnancy weeks, trimesters and key milestone dates.
Read article HealthIdeal Weight for Height: Formulas, Chart & Healthy Range for Men and Women
The Devine, Robinson, Miller and Hamwi formulas with worked examples, an ideal weight chart from 5 ft to 6 ft, the BMI-based healthy range for Indians and how to reach it.
Read article Dates & AgeHow to Calculate Days Between Two Dates: Calendar Days, Business Days & Excel
A simple manual method with a worked example, the subtraction formula, when to include the end date, leap years, counting business days, adding days, and Excel NETWORKDAYS.
Read article Time & WorkHow to Calculate Hours Worked: Breaks, Night Shifts, Decimal Hours & Pay
The hours-worked formula, borrowing minutes, AM/PM conversion, night shifts across midnight, decimal hours, a weekly timesheet, pay, overtime rules and Excel formulas.
Read article PDF ToolsHow to Compress a PDF to 100KB, 200KB or 500KB for Online Forms
Why scanned PDFs are huge, step-by-step compression, hitting 100 KB, 200 KB or 500 KB limits, scan settings, phone scanning, merging and splitting, and keeping documents private.
Read article Image ToolsHow to Compress an Image to 100KB, 50KB or 20KB for Online Forms
What decides file size, step-by-step compression to 100 KB, 50 KB or 20 KB, resizing first, photo and signature requirements for exam forms, formats and quality tips.
Read article VATHow to Calculate VAT: Add and Remove 20% VAT with Examples (UK 2026)
Formulas to add and remove 20% and 5% VAT, the 1/6 VAT fraction, a mixed-rate invoice example, UK rates, the £90,000 threshold, VAT schemes and common mistakes.
Read article MortgagesHow to Calculate a Mortgage Payment: Formula, PITI, PMI & Extra Payments
The mortgage payment formula with a $320,000 example, PITI and PMI, amortization, 15 vs 30-year loans, extra payments, the 28/36 affordability rule and a UK example.
Read article MathsQuadratic Formula: How to Solve Quadratic Equations with Solved Examples
The quadratic formula, the discriminant and nature of roots, solved examples with real, equal and complex roots, factorisation, completing the square and the vertex.
Read article MathsHow to Add, Subtract, Multiply and Divide Fractions (with Mixed Numbers)
Adding fractions with the same and different denominators, subtracting, multiplying and dividing, simplifying, mixed numbers, comparing fractions and converting to decimals.
Read article MathsMean, Median and Mode: How to Find Them with Examples
Formulas and worked examples for mean, median and mode, which to use and why, range, weighted averages for CGPA, standard deviation, grouped data and Excel functions.
Read article MathsHow to Use a Scientific Calculator: Keys, DEG vs RAD, Logs and Examples
What every scientific calculator key does, the DEG vs RAD trap, BODMAS, worked trigonometry, log, power and nCr examples, scientific notation and exam tips.
Read article WritingHow Many Words Is an Essay? Word Counts, Pages, Reading Time and Limits
Typical essay lengths, words per page single and double-spaced, reading and speaking time, character limits for social media and applications, and how to add or cut words.
Read article ConstructionHow to Calculate Bricks, Cement and Sand for a Wall (with Examples)
Standard brick sizes, the brick calculation formula, a worked 3 m × 3 m 9-inch wall with cement and sand, a 10 ft × 10 ft example, openings, cost and wastage tips.
Read article Land & PropertyGuntha to Acre, Hectare to Acre and Are to Guntha: Land Unit Conversion
Hectare, are, acre and guntha explained, a full conversion table, formulas for each conversion, reading H-R on a 7/12 extract, worked examples and land-buying tips.
Read article Jobs & HRNotice Period Rules in India: Last Working Day, Buyout and Early Release
Typical notice periods, calculating your last working day with examples, calendar vs working days, buyout formula, early release, leave, F&F settlement and resignation tips.
Read article Government JobsGovernment Employee Retirement Age and How to Calculate Your Retirement Date
Retirement ages for central, state and other government employees, the FR 56 month-end and 1st-of-month rules with examples, qualifying service, OPS, NPS and UPS, and benefits.
Read article Home LoansPrepay Home Loan or Invest in SIP? A Numbers-Based Comparison
A ₹40 lakh loan example: interest saved by prepaying ₹1 lakh a year versus investing it at 8%, 10% and 12%, the break-even rule, tax effects, risk and a balanced approach.
Read article MathsSimple Interest Formula: How to Calculate Simple Interest with Examples
SI = P × R × T ÷ 100 with examples for years, months and days, formulas to find principal, rate and time, doubling time, simple vs compound interest and real-life uses.
Read article Conversionscm to Feet and Inches: Height Conversion Chart, Formula and Examples
Formulas to convert cm to feet and inches and back, a full 150–190 cm height chart, decimal feet explained, metres to feet, mental tricks and how to measure height at home.
Read article SEOHow to Write a Meta Title and Meta Description That Rank and Get Clicks
What title tags and meta descriptions do, ideal lengths, how to write both with formulas and examples, why Google rewrites snippets, Open Graph tags and a checklist.
Read article Image ToolsHow to Remove the Background from a Photo for Free with AI
How in-browser AI background removal works, what it is best for, step-by-step use, transparent PNG vs white JPG, tips for clean hair edges, profile photos and privacy.
Read article Jobs & HRHow to Calculate UK Holiday Entitlement: 5.6 Weeks, Part-Time and 12.07%
The 5.6-week rule, holiday in days and hours, the 12.07% accrual for irregular-hours and part-year workers, starters and leavers, bank holidays, holiday pay and carry-over.
Read article Home LoansHow to Calculate Home Loan EMI: Formula, Examples & EMI Table (2026)
Step-by-step EMI formula with a ₹30 lakh worked example, EMI per lakh and EMI tables for ₹20 lakh to ₹1 crore, Excel PMT, amortization, tax benefits and 7 ways to reduce your EMI.
Read article Income TaxNew vs Old Tax Regime FY 2026-27: Which Is Better for You?
Slabs for both regimes, the ₹12 lakh rebate and marginal relief, allowed deductions, tax at ₹8 lakh to ₹30 lakh salary and the break-even rule that tells you which regime to pick.
Read article InvestingSIP vs FD: Which Is Better in 2026? Returns, Risk & Tax Compared
₹5,000 a month in a SIP vs a recurring deposit for 5–20 years, lump sum comparison, FD rates in 2026, how each is taxed, and a simple rule for choosing between them.
Read article GSTHow to Calculate GST: Formula, Examples & New GST 2.0 Rates
Formulas to add and remove GST with worked examples, the new GST 2.0 slabs, how CGST, SGST and IGST are split, GST on MRP, input tax credit and GST in Excel.
Read article MathsHow to Calculate Percentage: Formulas, Marks, Increase & Examples
Every percentage formula with worked examples: percentage of a number, marks and CGPA, increase and decrease, reverse percentage, discount, profit and percentage in Excel.
Read article HealthBMI for Indians: How to Calculate BMI, BMI Chart & Healthy Range
The BMI formula in metric and imperial units, WHO vs Asian-Indian categories, a healthy weight chart for 150–185 cm, waist size limits, BMI limitations and safe ways to lower BMI.
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