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Unit Converter Tool

Measurement guides

Clear explanations, exact formulas and practical tables — each linked to a working converter.

Metric vs Imperial

Metric vs imperial: how the two systems really compareWhere metric and imperial units come from, how they are defined today, and the conversions that matter most in daily life.

Measurement Guides

Significant figures and rounding: how precise should a conversion be?Why 1 mile is not “1.609344000 km” on a road sign, how to choose sensible precision, and when exact factors matter.

Engineering Conversions

Torque, pressure and power: a field guide to engineering conversionsThe engineering conversions that trip people up most — torque vs energy, gauge vs absolute pressure, and the three horsepowers.

Scientific Units

The seven SI base units and how they are defined todaySince 2019 every SI unit is defined by a fixed constant of nature. Here is what that means for the metre, kilogram, second and the rest.

Cooking Measurements

Cooking conversions: cups, spoons, grams and oven temperaturesUS vs metric cups, tablespoons and teaspoons, why weighing beats measuring by volume, and an oven temperature chart with gas marks.

Construction Measurements

Construction math: square footage, cubic yards and board feetHow to work out floor area, concrete and mulch volumes, lumber board feet and insulation R-values — with the conversions builders use.

Everyday Conversion Tips

Mental math shortcuts for everyday unit conversionsQuick, good-enough tricks for temperature, distance, weight and speed — and how far off each shortcut is.

International Measurement Systems

The metric system around the world: a practical guide for travellersWhich measurements change when you travel — speed limits, fuel, temperatures, clothing and recipes — and how to convert them on the go.