Everyday Numbers
Acres, Hectares and Square Miles: Land Area Units Compared
Land listings and maps use acres in some places and hectares in others. See how the units relate, how to convert them exactly, and how to avoid the squared-factor mistake.
Everyday Numbers
Guides to unit conversions, cooking measures, travel numbers and other small everyday calculations, with worked examples.
Everyday Numbers
Celsius, Fahrenheit and Kelvin: Formulas and Oven Marks
Temperature scales do not share a zero, so conversion needs a multiplication and an addition. Here are the exact formulas, a quick estimate, and an oven chart.
Everyday Numbers
km/h, mph, m/s and Knots: Speed Unit Conversions Explained
Four speed units, each a distance divided by a time. Learn the exact factors, a handy reference table, quick estimates, and why averaging two speeds directly goes wrong.
Everyday Numbers
Mbps vs MB/s: Why Downloads Look Slower Than Your Plan
A 200 Mbps plan that shows 25 on your screen is not broken. Bits and bytes differ by a factor of eight, and this guide shows how to convert and estimate download times.
Everyday Numbers
MPG vs L/100 km: How to Compare Fuel Economy Fairly
Miles per gallon and liters per 100 kilometers describe the same thing from opposite directions. Here is how to convert between them and why the gap matters.
Everyday Numbers
US vs Imperial Gallons, Pints, Cups and Spoons
The US and imperial systems share unit names but not sizes. This guide compares gallons, pints, fluid ounces, cups and spoons so a recipe or label is never off by 20%.
Everyday Numbers
Why a 1 TB Drive Shows 931 GB: Decimal vs Binary Units
No space is missing from a 1 TB drive that reports 931 GB. Two definitions of the same prefixes are in use, and the gap grows with each step up in size.
Everyday Numbers
Why a Cup of Flour Weighs Less Than a Cup of Sugar
Cups and grams are not interchangeable because ingredients differ in density. Here is how to convert between them, and why weighing beats scooping for baking.