Understand the numbers, not just the answer.
Each guide is written around one of our tools, with worked examples you can reproduce in seconds.
Finance Calculators
Loan Calculator
- 01 How Loan Amortization Works (With a Worked Example) Why early loan payments are mostly interest, how each payment is split between interest and principal, and how to read an amortization schedule.
- 02 Fixed vs Variable Interest Rates: Which Loan Is Right for You? How fixed and variable (floating) rate loans work, how a rate change affects your payment, and a simple way to decide which suits your situation.
- 03 How to Pay Off a Loan Faster: 7 Strategies That Save Interest Practical, number-backed ways to pay off a loan early — extra payments, bi-weekly schedules, rounding up, refinancing — and when early repayment doesn't make sense.
Compound Interest Calculator
- 01 Compound vs Simple Interest: The Difference, With Examples Simple interest grows in a straight line; compound interest snowballs. See the formulas, side-by-side examples and why starting early beats investing more later.
- 02 The Rule of 72: How Long Does It Take to Double Your Money? Divide 72 by the interest rate to estimate how many years money takes to double. How the Rule of 72 works, how accurate it is, and smart ways to use it.
- 03 Compounding Frequency Explained: Daily vs Monthly vs Annual (APR vs APY) How daily, monthly, quarterly and annual compounding change your returns, the difference between APR and APY, and why frequency matters less than rate and time.
Discount Calculator
- 01 How to Calculate a Discount: Formulas, Mental Maths Tricks and Examples Work out any sale price in seconds. The discount formula, three mental-maths shortcuts, reverse discounts and worked examples for 10%, 15%, 20%, 25% and 30% off.
- 02 Stacked Discounts Explained: Why 20% + 10% Isn't 30% Off How successive discounts multiply rather than add, how to find the effective discount, and how to compare 'extra % off' deals against a single sale price.
- 03 Markup vs Margin vs Discount: A Plain-English Guide for Sellers Markup is calculated on cost, margin on selling price, and discounts eat into margin faster than you'd think. Formulas, conversion tables and pricing examples.
Math Calculators
Percentage Calculator
- 01 How to Calculate Percentages: The Only 4 Formulas You Need A clear guide to percentages — finding a percent of a number, what percent one number is of another, percentage change and reverse percentages — with everyday examples.
- 02 Percentage Increase and Decrease: How to Calculate Change Correctly How to calculate percentage increase and decrease, why a 50% drop needs a 100% gain to recover, successive changes, and common mistakes in news and finance.
- 03 Percent vs Percentage Points: What's the Difference? Why a rise from 4% to 5% is one percentage point but a 25% increase. How to read interest rates, polls, statistics and headlines without being misled.
MathKit — Scientific Calculator & Math Toolkit
- 01 How to Solve Quadratic Equations: 3 Methods With Worked Examples Solve ax² + bx + c = 0 by factoring, completing the square and the quadratic formula. Understand the discriminant, complex roots and the vertex of a parabola.
- 02 GCD and LCM Explained: How to Find the Greatest Common Divisor and Least Common Multiple What GCD (HCF) and LCM mean, three ways to find them — listing, prime factorisation and Euclid's algorithm — and where they're used in fractions, scheduling and more.
- 03 Mean, Median, Mode and Standard Deviation: A Practical Guide When to use mean vs median vs mode, what standard deviation and variance actually tell you, and the difference between sample and population formulas — with examples.
Area Calculator & Land Unit Converter
- 01 Marla, Kanal and Acre Conversion: The Complete Guide (Pakistan & India) How many square feet are in a marla and a kanal, why the answer differs between cities, and conversion tables for marla, kanal, acre, square feet, square yards and square metres.
- 02 How to Calculate the Area of an Irregular Plot of Land Three reliable methods for measuring irregular plots — splitting into shapes, triangulation with Heron's formula and the surveyor's shoelace formula — with step-by-step examples.
- 03 Area Formulas for Common Shapes (With Diagrams in Words and Examples) Area formulas for squares, rectangles, triangles, circles, ellipses, trapezoids, parallelograms, rhombuses and kites, with worked examples and unit conversion tips.
Health Calculators
BMI Calculator
- 01 What Is a Healthy BMI? Ranges, Charts and What Your Number Means Adult BMI categories explained, a height-to-healthy-weight chart, how BMI is calculated, and what to do if your result is outside the healthy range.
- 02 BMI Limitations: When Body Mass Index Misleads, and Better Alternatives Why BMI can misclassify athletes, older adults and different ethnic groups, and how waist circumference, waist-to-height ratio and body-fat percentage fill the gaps.
- 03 BMI for Asian Adults: Why the Healthy Range Is Lower Why WHO and national health bodies recommend lower BMI cut-offs for South Asian, Chinese and other Asian populations, the adjusted ranges, and what it means for you.
Calorie Calculator
- 01 BMR vs TDEE: What's the Difference and Which Should You Eat? Basal metabolic rate vs total daily energy expenditure explained — what each includes, how they're calculated, worked examples, and why you should never eat at your BMR.
- 02 How Many Calories Should I Eat to Lose Weight? A Realistic Guide How to set a calorie deficit that works — how big it should be, how fast to expect results, why weight loss slows down, and how to adjust when progress stalls.
- 03 How to Choose Your Activity Level for Calorie Calculators (Honestly) Sedentary, lightly, moderately or very active? How activity multipliers work, how to pick the right one, and why most people overestimate — with step-count guidelines.
Text & Developer Tools
Word Counter
- 01 How Many Pages Is 500, 1,000 or 2,000 Words? (Word Count to Pages Chart) Convert word count to pages for single- and double-spaced documents, see how font and size change the result, and get typical lengths for essays, articles and books.
- 02 Ideal SEO Title and Meta Description Length (and How to Write Them) How long page titles and meta descriptions should be, why Google truncates by pixels not characters, and a practical checklist for writing snippets that earn clicks.
- 03 How Reading Time Is Calculated (Words per Minute Explained) How 'x min read' estimates work, average reading and speaking speeds, why 238 wpm is the research-based average, and how to estimate time for speeches and presentations.
Lorem Ipsum Generator
- 01 Where Does Lorem Ipsum Come From? The History of Placeholder Text The surprising origin of lorem ipsum in Cicero's 45 BC philosophy, how it became the printing industry's filler, and what the scrambled Latin actually means.
- 02 When to Use Placeholder Text (and When Not To) Lorem ipsum is perfect for early layouts and terrible for usability testing. When placeholder text helps, when it hurts, and how much to use in common design components.
- 03 Lorem Ipsum Alternatives: Better Placeholder Content for Real Projects Options beyond classic lorem ipsum — proto-content, real sample data, localized filler, and placeholders for images, names and numbers — and when to use each.
Text Repeater
- 01 10 Practical Uses for a Text Repeater From test data and checklists to SQL values and social posts, ten real-world ways to use a text repeater — with the exact settings for each.
- 02 How to Generate Test Data Quickly With Repeated Text Use repeated text to stress-test layouts, form limits, tables, search and file uploads. Practical recipes for designers, developers and QA testers.
- 03 Build Lists for Spreadsheets and Code With a Text Repeater Recipes for CSV rows, SQL VALUES, JSON arrays, HTML elements, Markdown tables and spreadsheet columns using repeat, separator, prefix and suffix settings.
JSON Formatter & Validator
- 01 Common JSON Errors and How to Fix Them The JSON syntax errors that break parsers most often — trailing commas, single quotes, unquoted keys, comments, bad escapes — with error messages, examples and fixes.
- 02 JSON Syntax Basics: A Beginner's Guide With Examples Learn JSON's six data types, objects and arrays, nesting, formatting rules and best practices for naming and structuring data — with clear examples.
- 03 JSON vs XML vs YAML: Which Data Format Should You Use? A practical comparison of JSON, XML and YAML — syntax, readability, comments, types, tooling and typical use cases — with the same data shown in all three formats.
Image Tools
Image Resizer & Compressor
- 01 Best Image Sizes for Websites and Social Media (2026 Cheat Sheet) Recommended pixel dimensions, aspect ratios and file formats for website heroes, blog images, Open Graph previews, Instagram, Facebook, X, LinkedIn, YouTube and more.
- 02 JPG vs PNG vs WebP: Which Image Format Should You Use? The differences between JPG, PNG and WebP — compression, transparency, quality and browser support — plus when to use AVIF, SVG and GIF, with a simple decision table.
- 03 How to Reduce Image File Size Without Losing Quality Six proven ways to make images smaller — resize, compress, change format, strip metadata, use responsive images and lazy loading — with target sizes for web, email and forms.
YouTube Thumbnail Downloader
- 01 YouTube Thumbnail Sizes Explained: maxres, sd, hq, mq and default Every YouTube thumbnail size and URL pattern, why maxresdefault is sometimes missing, Shorts thumbnails, and the recommended specs for uploading custom thumbnails.
- 02 How to Design a YouTube Thumbnail That Gets Clicks Practical principles for high-CTR YouTube thumbnails — one focal point, bold text, contrast, faces and emotion, consistent branding — plus specs, testing and common mistakes.
- 03 Can You Use YouTube Thumbnails? Copyright and Fair Use Explained Who owns YouTube thumbnails, when downloading and reusing them is generally acceptable, fair use and fair dealing basics, and safe practices for blogs, videos and research.
Education Tools
Negative Marks Calculator
- 01 How Negative Marking Works in MCQ Exams (With Examples) What negative marking is, the common schemes (¼, ⅓, ½, +4/−1), how to calculate your final score step by step, and why exams use it.
- 02 Should You Guess in an Exam With Negative Marking? The Maths Says… Expected value explained for MCQ guessing — when a blind guess helps or hurts under ¼, ⅓ and ½ penalties, why eliminating one option changes everything, and a simple decision rule.
- 03 MCQ Exam Strategy: How to Maximise Your Score With Negative Marking A practical game plan for multiple-choice exams with negative marking — multi-pass approach, time management, elimination, accuracy targets and how to use mock tests.
Time Table Maker
- 01 How to Make a Study Timetable That You'll Actually Stick To A step-by-step method for building a realistic weekly study timetable — fixed commitments, priorities, session length, breaks, revision slots and weekly reviews.
- 02 Time Blocking for Students: Plan Your Week in Blocks, Not Lists How time blocking works, why it beats to-do lists for studying, how to set up theme days and task blocks, and how to handle interruptions — with a sample weekly layout.
- 03 How to Balance Subjects in a Weekly Timetable A simple scoring method to decide how many hours each subject deserves, how to distribute sessions across the week, and how to adjust as exams approach.