Measurement guides
Clear explanations of the conversions people get wrong most often — written for everyday use, with formulas, worked examples and reference tables.
- Length
How to Convert Inches to Feet
There are exactly 12 inches in a foot. Divide inches by 12 to get feet, with worked examples, a quick reference table and how to handle the leftover inches.
- Temperature
How to Convert Celsius to Fahrenheit
Multiply Celsius by 9/5 and add 32 to get Fahrenheit. Includes the reverse formula, a mental-maths shortcut, common temperatures and why an offset is required.
- Length
Metric vs Imperial Measurements
How the metric system, the Imperial system and US customary units differ, which countries use which, and the conversion factors that link them.
- Volume
US Gallon vs Imperial Gallon
A US liquid gallon is 3.785 litres; an Imperial gallon is 4.546 litres — about 20% larger. How the two differ, and what it means for fuel economy and recipes.
- Length
How Many Inches Are in a Foot?
There are exactly 12 inches in one foot. Here is the definition, the conversion in both directions and a reference table of feet to inches.
- Length
How Many Feet Are in a Mile?
A statute mile contains exactly 5,280 feet. Learn where the number comes from, plus yards, kilometres and the nautical mile compared.
- Weight & Mass
How Many Ounces Are in a Pound?
There are 16 avoirdupois ounces in a pound. Includes the troy ounce difference, a conversion table and how ounces relate to grams and kilograms.
- Weight & Mass
Stone to Pounds and Kilograms
One stone equals 14 pounds or 6.35029318 kilograms. How the British stone works for body weight, with a full stone-to-pounds-to-kg table.
- Data Storage
KB vs KiB — Decimal and Binary Data Units
A kilobyte is 1,000 bytes; a kibibyte is 1,024. Why a 1 TB drive shows as 931 GB, and how to convert between decimal (SI) and binary (IEC) units.
- Length
US Customary vs Metric
Which units Americans actually use, how they map to metric equivalents, and the exact conversion factors for length, weight, volume and temperature.
- Volume
Imperial Measurements Explained
A guide to the Imperial units still used in the UK — miles, stone, pints and Imperial gallons — and how they convert to metric.
- Length
Metric Conversion Chart
A printable-style metric conversion chart covering length, weight, volume, area and temperature with exact factors for US and Imperial units.
- Length
Canadian Metric Conversions
Canada is metric on paper but imperial in the kitchen, the lumber yard and the gym. The conversions Canadians look up most, with exact factors.
- Volume
Australian and New Zealand Metric Conversions
Australia and New Zealand are fully metric. The conversions that still come up — US recipes, imported specs, imperial legacy units — with exact factors.