Guides & tutorials
Clear, practical explainers on the things our tools help you do — from loan EMIs and GST to PDFs and percentages. Written to be genuinely useful, not just to fill a page.
How Much Paint Do You Need for a Room? A Simple Measuring Method
Measure walls, subtract doors and windows, allow for coats and coverage rate — a step-by-step method that stops you buying too much or running out mid-wall.
What Is Standard Deviation? A Plain-English Guide With Worked Examples
Standard deviation measures how spread out your numbers are. Here is the calculation step by step, the sample-versus-population question, and how to read the result.
APR vs APY: Why Two Rates on the Same Money Look Different
APR and APY describe the same money in different ways. Here is the formula linking them, why your credit card costs more than the advertised rate, and which number to compare.
Why Your iPhone Photos Are HEIC (and How to Convert Them to JPG)
What the HEIC format is, why Apple switched to it, why the files refuse to open on some devices, and three ways to get a normal JPG you can send anywhere.
What Is a Regular Expression? A Practical Guide to Regex Patterns
Regex explained without jargon: what the symbols mean, how quantifiers and anchors work, five patterns worth stealing, and the mistakes that make patterns fail.
How FD Interest Is Calculated: The Formula Banks Actually Use
How fixed deposit interest really works — simple vs quarterly compounding, the exact formula with a ₹1 lakh worked example, cumulative vs payout FDs, and what quietly changes your return.
What Is EXIF Data? What Your Photos Quietly Reveal — and How to Remove It
Every photo you take carries hidden EXIF metadata: GPS location, device details, exact timestamps. Learn what it reveals, when it matters, and how to strip it before sharing.
Sleep Cycles Explained: Why Waking at the Right Time Beats Sleeping Longer
What happens inside a 90-minute sleep cycle, why waking mid-cycle leaves you groggy, and how to time your bedtime so the alarm lands between cycles, not in the middle of one.
The Pomodoro Technique: How 25-Minute Sprints Fix a Wandering Mind
What the Pomodoro Technique is, the exact five steps, the psychology of why short sprints beat marathon sessions, and how to adapt the intervals to your work.
What Is a Unix Timestamp and How to Convert It to a Real Date
Why computers count seconds since 1970, how to tell seconds from milliseconds at a glance, how to convert a timestamp to a date, and what the year 2038 problem is.
How to Calculate a Mortgage Payment (Formula + Worked Example)
The exact formula for a monthly mortgage payment, a step-by-step worked example you can follow by hand, and what the payment does and does not include.
Sukanya Samriddhi vs PPF for Your Child's Future
Two safe, government-backed ways to save for a child in India — how Sukanya Samriddhi Yojana and PPF compare on returns, rules and flexibility.
Home Loan Tax Benefits in India: What You Can Claim
How a home loan reduces your tax through deductions on interest and principal, the relevant sections, and how it fits the old vs new regime.
EPF Explained: How Your Provident Fund Grows
What the Employees' Provident Fund is, how employee and employer contributions build your corpus, the tax benefits, and withdrawal rules.
Why You Should Step Up Your SIP Every Year
A step-up SIP raises your investment with your income each year and can dramatically increase your final corpus. Here is why and by how much.
How to Save Tax Under Section 80C: The Complete Checklist
A clear guide to Section 80C — the deduction limit, every eligible investment and expense, and how to use it without wasting money.
NPS Explained: Building a Retirement Corpus in India
What the National Pension System is, how it builds a retirement corpus, its extra tax benefit, and the rules on withdrawal and annuity.
PPF vs ELSS: Where Should You Invest for Tax Saving?
PPF and ELSS both save tax under Section 80C but differ hugely on risk, returns and lock-in. Here is how to choose between them.
How Much Do You Need to Retire? The 4% Rule and Beyond
How to estimate your retirement number using the 4% rule, what it gets right and wrong, and how to plan your path there.
Understanding Your US Paycheck: Where Your Money Goes
A breakdown of the deductions on a US paycheck — federal and state tax, Social Security, Medicare and benefits — and how to read your take-home pay.
How to Pay Off Credit Card Debt Fast
Why credit card interest is so punishing, the avalanche and snowball methods compared, and a clear plan to get debt-free.
The Power of Compound Interest for Investors
How compounding turns modest, regular investing into real wealth, why starting early matters so much, and how to put it to work.
How to Build an Emergency Fund (and How Big It Should Be)
Why an emergency fund is the foundation of financial security, how many months to save, where to keep it, and how to build it from zero.
401(k) vs Roth IRA: Which Retirement Account Should You Use?
How a 401(k) and a Roth IRA differ on taxes, limits and employer matches, and a simple order of priority for most US savers.
How Much House Can You Afford? A Practical US Guide
How lenders decide what you can borrow, the 28/36 rule, the costs beyond the mortgage, and how to set a budget you can actually live with.
Carbs Explained: Simple vs Complex, and How Many You Need
What carbohydrates actually do, the difference between simple and complex carbs, and how to fit them into a healthy diet.
Fad Diets vs Sustainable Eating: What Actually Works
Why fad diets deliver fast results then fail, what they have in common, and how to build a sustainable approach that lasts.
High-Protein Foods and Why Protein Matters
Why protein is the most important macro for weight loss and health, plus a practical list of high-protein foods for every diet.
Are All Calories Equal for Weight Loss?
Why a calorie is a calorie for weight change, but food quality still matters enormously for hunger, health and whether you stick to it.
How to Count Calories Accurately (and Avoid Common Mistakes)
Why calorie counts are easy to underestimate, how to track honestly, and the simple habits that make counting actually work.
Intermittent Fasting Explained: Methods, Benefits and Cautions
What intermittent fasting is, the common schedules, what the evidence does and does not show, and who should avoid it.
Keto vs Low-Carb: What's the Difference?
Keto and low-carb both cut carbohydrates, but they are not the same. Here is how they differ, who each suits, and how to choose.
The Keto Diet Explained: A Beginner's Guide
What the ketogenic diet is, how it works, what you can and cannot eat, the real pros and cons, and who should be cautious before trying it.
Target Heart Rate for Exercise Explained (and the Fat-Burning Zone Myth)
How to find your target heart rate zones, what each zone is good for, and the truth about the so-called fat-burning zone.
How to Keep Weight Off After Losing It
Why maintenance is its own skill, how to find your new maintenance calories, and the habits that make weight loss stick for good.
Waist-to-Hip Ratio: A Simple Health Marker You Can Measure at Home
What waist-to-hip ratio is, how to measure it correctly, the ranges linked to higher risk, and why where you carry fat matters.
How Long Does It Take to Lose Weight Safely?
A realistic timeline for healthy weight loss, why slower is more durable, and how to estimate how long reaching your goal will take.
What Is a Healthy Weight for Your Height?
How to find a healthy weight range for your height using BMI, why it is a range rather than a single number, and where BMI falls short.
Body Fat Percentage Explained: What It Is and How to Estimate It
What body fat percentage means, healthy ranges for men and women, how home methods estimate it, and why it tells you more than weight alone.
How to Calculate Your Macros: A Beginner-Friendly Guide
What macros are, how to split protein, carbs and fat for your goal, and the simple maths that turns a calorie target into a daily plan.
How Much Protein Per Day to Lose Weight (Without Losing Muscle)
How much protein supports fat loss while protecting muscle, simple gram-per-kilogram targets, and easy ways to hit them across the day.
BMR vs TDEE: What They Mean and Why Both Matter
BMR is what your body burns at rest; TDEE is what you burn in a whole day. Here is the difference, how each is calculated, and how to use them for weight goals.
How Many Steps a Day to Lose Weight? A Realistic Answer
How many steps you really need to support weight loss, how many calories steps burn, and why daily movement works best alongside what you eat.
VAT Explained: How to Add and Remove VAT Correctly
How to add VAT to a net price, how to work backwards from a gross price to find the VAT, and the simple formulas with worked examples.
Markup vs Margin: The Difference Every Seller Should Know
Markup and margin sound similar but mean different things — confusing them quietly destroys profit. Here is the difference, the formulas, and a worked example.
Calorie Deficit Explained: A Sustainable Approach to Weight Loss
A calorie deficit is the basis of weight loss — here is how to estimate a healthy, sustainable one, why crash dieting backfires, and how to find your own numbers.
Break-Even ROAS: The Minimum Return Your Ads Need
Break-even ROAS is the return on ad spend at which you neither make nor lose money — here is how to calculate it from your margin, and why it is the number that matters.
Etsy Fees Explained: How Much Does Etsy Actually Take?
Etsy charges a listing fee, a transaction fee, payment processing and often ads — here is how they stack up on a real sale, and how to price so you still profit.
Old vs New Tax Regime: Which One Is Cheaper for You?
A plain-English comparison of India's old and new income tax regimes — who saves under each, how deductions tip the balance, and how to check your own case.
How Much Will a ₹5,000 Monthly SIP Grow To in 20 Years?
A ₹5,000 monthly SIP can grow to roughly ₹50 lakh in 20 years at 12% — here is the maths, why most of it is pure compounding, and how a step-up changes everything.
How to Decode a JWT: Reading JSON Web Tokens Safely
JSON Web Tokens power modern logins. Learn what the three parts of a JWT mean, how to decode one, and why decoding is not the same as verifying.
What Is a UUID and When Should You Use One?
A clear explanation of UUIDs — what they are, how they stay unique without a central authority, the difference between versions, and when to use them.
How to Calculate Running Pace (and Use It to Run Smarter)
Learn what running pace means, how to calculate pace per kilometre or mile, how to convert pace to finish time, and how to use pace zones to train better.
How to Calculate Your HRA Exemption (With Examples)
House Rent Allowance can cut your tax bill — if you claim it correctly. Here is the three-part rule that decides your HRA exemption, with worked examples.
How to Calculate Gratuity in India: Formula and Worked Examples
Understand who is eligible for gratuity, the exact formula used to calculate it, the tax-free limit, and worked examples for private and government employees.
How to Set Your Freelance Hourly Rate
A practical method to price your freelance work: start from your income goal, account for unbillable time and expenses, and avoid the most common underpricing trap.
What Is a Hash? MD5 vs SHA-256 Explained
A plain-English guide to hashing: what a hash function does, why it is one-way, the difference between MD5 and SHA-256, and why hashing is not encryption.
How to Read and Lower Your Electricity Bill
Understand what a 'unit' of electricity is, how your bill is calculated, which appliances cost the most, and practical ways to bring the total down.
Mean, Median and Mode: What's the Difference?
The three 'averages' explained simply — how to calculate mean, median and mode, when each is the right one to use, and why they can disagree.
How Much Water Should You Drink a Day?
Where the '8 glasses a day' rule comes from, how to estimate your real water needs from body weight and activity, and the signs you are drinking enough.
What Is Base64 Encoding and How to Decode It
A plain-English explanation of Base64: what it is, why it is used for email attachments and data URLs, how it works, and why it is encoding — not encryption.
How to Calculate Fuel Cost for a Trip
Work out exactly what a journey will cost in fuel: the simple formula using distance, mileage and fuel price, with worked rupee examples and money-saving tips.
How to Convert CGPA to Percentage (With Examples)
Convert CGPA to a percentage correctly: the common 9.5 multiplier, why boards and universities differ, and how to handle your own grading scale.
What Is TDEE and How to Calculate It
Total Daily Energy Expenditure explained: what TDEE means, how it builds on your BMR, the activity multipliers, and how to use it to lose, maintain or gain weight.
What Is PPF and How Its Interest Is Calculated
Understand the Public Provident Fund: how PPF interest is calculated on the lowest monthly balance, why deposit timing matters, and how the 15-year lock-in builds wealth.
How to Create a Strong Password You Can Actually Use
What makes a password strong, why length beats complexity, and how to generate and manage passwords safely.
Word and Character Count: Why It Matters and How to Track It
Where word and character limits show up — from essays to tweets to meta descriptions — and how to count accurately.
How to Convert Image Formats (JPG, PNG, WebP) the Right Way
What the main image formats are for, when to use each, and how to convert between them without quality loss — privately in your browser.
Discount and Sale Price Calculation Made Easy
How to calculate a discount, the final sale price, stacked discounts and the original price before a discount — with quick examples.
CAGR Explained: How to Measure Investment Growth Properly
What CAGR means, the formula, how it differs from average return, and why it is the fairest way to compare investments over time.
How to Merge and Split PDF Files (Without Uploading Them)
When to combine or separate PDFs, how page ranges work, and how to do it privately in your browser without losing quality.
How to Calculate Your Exact Age (Years, Months and Days)
Why calculating age is trickier than it looks, how to do it correctly accounting for leap years, and how to find your age on any date.
How to Convert Units: Length, Weight and Temperature Made Simple
The logic behind unit conversion, the most useful conversion factors, and how to avoid the classic mistakes.
BMI Explained: How to Calculate It and What It Really Means
How to calculate Body Mass Index, what the categories mean, and the important limitations of BMI as a measure of health.
QR Codes Explained: How They Work and How to Make One
What QR codes are, what they can store, where they are useful, and how to generate one for free in your browser.
How to Compress a PDF Without Losing Quality
Why PDFs get large, how compression actually works, and how to shrink a PDF for email or upload while keeping it readable — privately, in your browser.
How Much to Save Each Month to Reach a Goal
How to work backwards from a savings goal to a monthly amount, with and without interest, plus tips to stay on track.
SIP vs Lumpsum: How to Calculate Mutual Fund Returns
What a SIP is, how SIP returns are calculated, and how systematic investing compares with investing a lump sum — with clear examples.
How to Split a Bill and Calculate the Tip Fairly
Quick methods to split a restaurant bill evenly or by item, how to handle tax and tip, and how to do it without awkward maths.
Simple vs Compound Interest: Formulas, Examples and Why It Matters
The difference between simple and compound interest, the formulas for each, and how compounding quietly builds (or costs) a fortune over time.
How Income Tax Slabs Work in India (Explained Simply)
What a tax slab is, how marginal rates actually work, the difference between the old and new regimes, and how to estimate your tax.
How to Calculate Percentage: Every Common Type Explained
Percentages made simple: percentage of a number, percentage change, reverse percentages and marks — with formulas and clear examples.
Home Loan Amortization Explained: Where Your EMI Really Goes
What an amortization schedule is, why early EMIs are mostly interest, and how prepayment can save you years of payments.
GST Calculation Guide: How to Add and Remove GST Correctly
A plain-English guide to GST: how to add GST to a price, how to work backwards to find the base price, and the exact formulas with examples.
How to Calculate EMI: The Formula, Worked Examples and Smart Tips
Understand exactly how loan EMI is calculated, see the formula worked out step by step, and learn how tenure and interest rate change what you pay.
How to Calculate the Number of Days Between Two Dates
Count the exact days between two dates, learn why month lengths and leap years make it tricky, and see how to count only working days.
How to Calculate Your Salary Hike Percentage
Work out your raise as a percentage, convert a target percentage into a new salary, and understand the difference between gross and in-hand hikes.
How to Resize an Image Without Losing Quality
Understand resolution, aspect ratio and the difference between resizing and compressing — and resize images privately in your browser.
Uppercase, Lowercase, Title Case: How to Convert Text Case Fast
The common text cases explained — sentence, title, upper, lower, camelCase — and how to convert between them instantly without retyping.
How Pregnancy Due Dates Are Calculated
How the estimated due date is worked out from your last period, why it's 40 weeks, and why it's an estimate rather than an exact day.
What Is JSON and How to Format It Properly
A plain-English intro to JSON, why formatting and validation matter, and how to tidy messy JSON instantly in your browser.
How to Convert Binary to Decimal (and Back)
Understand how binary works, the simple method to convert binary to decimal and decimal to binary, with clear worked examples.
How to Remove an Image Background for Free
When and why to remove a background, what makes some images easier than others, and how to do it privately in your browser.