How to Convert Hourly Wage to Salary
Turn hourly pay into yearly, monthly and weekly salary (and back), with the 2,080-hour rule, quick mental shortcuts and the details that…
h/guides · How-to Guides
Step-by-step guides that go with our free tools.
Profit Margin vs Markup: What’s the Difference?
Margin and markup use the same numbers but answer different questions. Learn both formulas, convert between them and price products…
Mean, Median and Mode Explained (With Examples)
Learn how to find the mean, median and mode of a set of numbers, when each average is the right one to use, plus range and weighted…
How Much Water Should I Drink a Day?
What official guidelines say about daily water intake, why the 8-glasses rule is only a rough guide, and how body weight, exercise and heat…
How Many Calories Should I Eat to Lose Weight?
Estimate how many calories you need to lose weight safely: work out maintenance calories (TDEE), choose a moderate deficit and adjust using…
How to Measure Body Fat at Home With a Tape Measure
Measure your body fat percentage at home with a tape measure and the U.S. Navy method: where to measure, worked examples, accuracy and…
How to Remove Duplicate Lines From a List
Remove duplicate lines from a list online, in Excel, Google Sheets, Notepad++ or the command line, and learn how to handle case, spaces and…
What Is Base64 Encoding? How It Works
Base64 explained simply: how it turns bytes into text, a step-by-step example, why output grows by a third, padding, URL-safe Base64 and…
How to Fix Invalid JSON: 10 Common Errors
Fix Unexpected token and other JSON errors: trailing commas, single quotes, comments, unquoted keys, bad escapes and more, with…
What Is a UUID? Versions, Format and Uses
UUIDs explained: the 8-4-4-4-12 format, how version 4 and version 7 differ, how unlikely collisions are, UUID vs GUID, and how to generate…
How to Convert HEX to RGB (and Back)
Convert HEX colour codes to RGB and back step by step, including shorthand and 8-digit alpha codes, with worked examples, CSS tips and a…
How to Pick a Random Winner Fairly
Pick a random winner for a giveaway, raffle or classroom draw fairly: prepare the entry list, remove duplicates, use a secure random picker…
How to Reduce Image Size Without Losing Quality
Make photos and graphics smaller without visible quality loss: resize to the display size, pick the right format, set a sensible quality…
Free Online Games, No Download: 40+ Browser Games
Play free browser games with no download or sign-up: puzzles, word games, board and card classics, arcade, racing and relaxing games,…
How to Win 2048: Corner Strategy Step by Step
Beat 2048 with the corner strategy: keep your biggest tile in a corner, build a chain, choose safe moves, avoid common traps and keep going…
Beginner Tips for Chess, Checkers and Four in a Row
Simple, practical strategy tips for three classic board games, plus how to use a computer opponent to learn faster instead of just…
How to Improve Your Typing Speed and Accuracy
Understand WPM, learn proper finger placement, and follow a practical practice plan to type faster with fewer mistakes.
Image Size for the Web: Resize, Compress, Format
Why image weight matters for speed, how to pick JPG, PNG or WebP, and how to resize and compress images privately in your browser.
Unit Conversion Cheat Sheet: Metric and Imperial
Handy conversion factors for length, weight, volume and temperature, plus tips for converting without mistakes.
How to Create Strong Passwords (and Remember Them)
What makes a password strong, why length beats complexity, how passphrases and password managers help, and what to avoid.
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