How to calculate TDEE and calories
Mifflin-St Jeor, the five activity factors UtilGenie uses, and worked calorie targets you can recompute. A planning estimate, not medical advice.
Guides for the tools
Practical guides to the formulas and file formats behind UtilGenie tools: TDEE, GPA, image formats, margin and markup, interest, and regular expressions.
How GPA is calculated on a 4.0 scale
Unweighted and weighted GPA on UtilGenie’s planning scale, including honors and AP bumps, percent cutoffs, and a cumulative example.
How to compress images for the web
What JPG, PNG, and WebP are good at, and what UtilGenie’s compressor, resizer, and converters actually write. No promised file-size percentage.
Profit margin vs markup explained
Margin divides profit by revenue. Markup divides profit by cost. Worked prices show why a 30% margin is not a 30% markup.
Simple vs compound interest explained
Simple interest, compound interest, continuous compounding, and the effective annual rate, with figures from UtilGenie’s two interest pages.
A beginner’s guide to regular expressions
Literals, classes, quantifiers, anchors, and flags, matched against the JavaScript rules UtilGenie’s regex tester actually runs.