Unit Converter Australia

Why Australians Still Need Unit Conversions

Australia officially adopted the metric system in 1974, yet imperial units persist in surprising corners of everyday life. American recipes call for cups and Fahrenheit. British building plans list inches and feet. US-made timber is sold in board feet. Imported tyres show pressure in PSI. A good unit converter is still a practical necessity.

Even within the metric system there's plenty of jumping around — kilojoules to calories, hectares to square metres, litres to millilitres. This converter covers all of it in a single tool.

Length Conversions

The base metric unit for length is the metre. Australia uses metres and kilometres for everyday distances, centimetres and millimetres for smaller measurements, and rarely encounters feet or inches outside imported contexts.

Common Length Conversions

Worked Example: Converting a TV Screen Size

US TVs are measured diagonally in inches. A 65-inch TV has a diagonal of 65 × 2.54 = 165.1 cm. Most Australians find it easier to visualise 165 cm than 65 inches when measuring a wall cavity.

Weight and Mass Conversions

Australia uses grams and kilograms for everyday weight. Older Australians sometimes still think in pounds and stones, especially for body weight, and American recipes routinely use ounces and pounds.

Worked Example: Baking with an American Recipe

A US muffin recipe calls for 2 cups of flour (about 240 g per cup = 480 g) and 1 stick of butter (113 g). Knowing the gram equivalents lets you use Australian kitchen scales instead of hunting for US cup measures.

Volume Conversions

Australia uses litres and millilitres. US recipes use fluid ounces, cups, pints, quarts, and gallons — none of which match their UK equivalents exactly, which is a source of constant confusion.

Note the US and UK gallon difference. A US gallon is about 3.79 litres; a UK/Imperial gallon is about 4.55 litres. Older Australian fuel efficiency figures (mpg) used Imperial gallons.

Temperature Conversions

Australia uses Celsius (°C). The US uses Fahrenheit (°F). The conversion formulas are not linear multipliers, which makes them harder to remember:

• °C to °F: multiply by 9/5, then add 32
• °F to °C: subtract 32, then multiply by 5/9
• °C to Kelvin: add 273.15

Worked Example: US Recipe Oven Temperature

An American recipe says bake at 350°F. Converting: (350 − 32) × 5/9 = 318 × 5/9 ≈ 177°C. Round to 180°C fan-forced for an Australian oven. This is the most common temperature mismatch Australians encounter.

Quick Reference: Common Temperatures

Area Conversions

Australian land is measured in square metres, hectares, and square kilometres. Property listings use square metres; rural land uses hectares. The US and UK use acres, which don't exist in the metric system.

Speed Conversions

Australia uses km/h for road speeds. Aircraft and marine speeds use knots. The US uses mph. Knowing the conversions is useful when reading imported vehicle specs or international weather reports.