Lease vs Buy a Car
Leasing means lower payments but no ownership; buying costs more per month but the car is yours. Here's how each works and which fits your situation.
Marco Bianchi · 3 min read
Guides & tutorials
Practical guides, how-tos and comparisons to get the most out of our free online tools.
October 13, 2025
How to Calculate Your Break-Even Point
Your break-even point is where revenue equals costs. Here's how to find it in units and revenue, and how to use it to make pricing decisions.
Camille Laurent · 3 min read
What Is a Good Credit Utilization Ratio?
Credit utilization is the share of your credit limit you're using. Here's what counts as good, why it matters for your score, and how to lower it.
Camille Laurent · 2 min read
October 10, 2025
What Is a QR Code?
A QR code is a 2D barcode a camera reads to open a link or text. Here's what it is, why it holds so much, its anatomy, and a safety note on scanning.
Daniel Okonkwo · 3 min read
Regex Basics: A Beginner's Guide
A regular expression is a pattern for matching text. Here are the building blocks — character classes, quantifiers and anchors — with a worked example.
Daniel Okonkwo · 3 min read
October 9, 2025
How Much Mulch Do I Need?
Multiply the bed's area by the depth you want. Here's the volume formula, how deep to spread it, bags vs bulk, and the cubic-yard version.
Marco Bianchi · 3 min read
October 8, 2025
How Much Protein Do You Need a Day?
Protein needs depend on your weight and activity, not a single number. Here's the baseline, how much more active people need, and how to spread it.
Sofia Nunes · 2 min read
October 7, 2025
How Much Should You Save for Retirement?
Save around 15% a year and aim for roughly 25 times your annual spending. Here's the rules of thumb, why starting early matters, and how to find your monthly number.
Camille Laurent · 3 min read
How to Estimate Your One-Rep Max (1RM)
Your one-rep max is the most you can lift once. Here's how to estimate it safely from a lighter set, how accurate it is, and how to train with it.
Aisha Karim · 3 min read
October 6, 2025
Counting Words Is Ambiguous, and Every Tool Answers Differently
A word count is a definition, not a measurement. We counted the same paragraph four ways and got 25, 28, 33 and 38 — then counted 50,000 characters of ordinary prose and got agreement to within 4.5%. The gap is entirely driven by compounds, figures and URLs.
Daniel Okonkwo · 12 min read
How Much Wallpaper Do You Need?
Measure the wall area, divide by a roll's usable coverage, then add for pattern repeat. Here's the method, with an example and why batch numbers matter.
Marco Bianchi · 3 min read
October 3, 2025
Formatting Numbers for Six Languages: Separators, Currency and the Parse Back
1,234.56 and 1.234,56 are the same number, and confusing them changes the value a reader parses. We ran Intl.NumberFormat for all six site locales and printed every separator — including the invisible one French uses — then measured why parseFloat cannot undo any of it.
Daniel Okonkwo · 13 min read