Articles & Guides
Read practical guides that explain the numbers behind common decisions, from personal finance and health planning to dates, percentages, and everyday problem-solving. Each guide is written to work alongside a calculator, so you can follow the method, change the inputs, and see the result update as you go.
Guide
How Many Business Days Until Your Deadline? Project Scheduling Basics
Plan a more realistic project timeline by counting business days, comparing them with calendar days, and using week numbers to set cleaner checkpoints.
Hannah ParkGuide
How Much Protein Do You Really Need? A Guide by Goal and Activity Level
Work out your daily protein target from your body weight, goal, and training load, then turn that number into meals you can actually stick with.
Elena VasquezGuide
Child Growth Percentiles Explained: Height, Weight, BMI, and When to Worry
A practical guide to child growth percentiles, growth charts, height-for-age, weight-for-age, and BMI-for-age, including what a dropped percentile means and when to talk to your paediatrician.
Sarah JohanssonGuide
Derivatives and Integrals: A Visual, No-Fear Introduction
Build real intuition for calculus by understanding what derivatives and integrals actually mean — slope, area, and the elegant link between them — then practise with interactive tools.
Priya KapoorGuide
What Is a Hash? SHA-256, MD5, and Checksums Explained
Learn what hash functions do, when to use SHA-256 instead of MD5, and how to verify checksums without treating cryptography like black magic.
Sophie ChenGuide
The Perfect Cup of Coffee: Ratios, Grinds, and Caffeine
Learn the coffee-to-water ratios, grind sizes, and caffeine basics that help you brew better coffee at home with less guesswork.
Rachel MurrayGuide
How to Cut Freight Shipping Costs with Better Container Loading
Work out pallet count, cargo volume, gross weight, and FCL-versus-LCL breakpoints before booking freight, so you avoid wasted space and surprise fees.
Carlos MendezGuide
How to Build a Six-Month Emergency Fund from Zero
Work out how much emergency savings you actually need, set a realistic monthly target, and build a budget that makes room for it — even if you're starting with nothing.
Michael BrennanGuide
What's Your Net Worth? How to Calculate It and Why It Matters
Add up everything you own, subtract everything you owe, and understand the single number that best captures your financial health — then set a plan to grow it.
James WhitfieldGuide
Calorie Deficit Explained: How to Lose Weight Without Crash Dieting
Learn how a calorie deficit works, calculate yours from real energy expenditure, and build a weight-loss plan that avoids the restrict-binge cycle.
Maria SantosGuide
🇺🇸Can You Afford to Retire Early? Running the FIRE Numbers
Calculate your FIRE number, stress-test the 4% rule, and see whether early retirement is realistic once taxes, healthcare, and timing are factored in.
James WhitfieldGuide
🇺🇸How Much Does Your Daily Commute Really Cost?
Calculate the true cost of driving to work — fuel, mileage, wear and tear — and see whether your commute is eating more of your salary than you realise.
Carlos Mendez