Metric to Imperial — Essential Conversions for Australians
| Metric Unit | Equals | Common Australian Use |
|---|
| 1 centimetre (cm) | 0.394 inches | Clothing, dimensions, height (old-timers) |
| 1 metre (m) | 3.281 feet / 1.094 yards | Room sizes, height measurement |
| 1 kilometre (km) | 0.621 miles | Road signs, travel distances |
| 1 kilogram (kg) | 2.205 pounds (lb) | Body weight, food, parcels |
| 1 litre (L) | 1.760 UK pints | Fuel, milk, beverages |
| 1 square metre (m²) | 10.764 square feet | Flooring, paving, property |
| 1 hectare (ha) | 2.471 acres | Land area, rural property |
Australian Temperature Reference
| °Celsius | °Fahrenheit | What It Means in Australia |
|---|
| 0°C | 32°F | Freezing — cold Canberra/alpine winter morning |
| 15°C | 59°F | Cool — jacket weather across southern states |
| 25°C | 77°F | Warm and pleasant — ideal Sydney/Brisbane day |
| 35°C | 95°F | Hot — typical Melbourne summer afternoon |
| 40°C | 104°F | Very hot — limit outdoor work, stay hydrated |
| 45°C+ | 113°F+ | Extreme heat — occurs in SA, WA, NT, outback NSW |
Australia's Metric Conversion History
Australia converted from imperial to metric measurements in the 1970s and early 1980s as part of the Metric Conversion Act 1970. Road signs changed, fuel moved from gallons to litres, and distances switched from miles to kilometres. All official measurements in Australia — including construction, medicine, engineering, road signs and weather — use metric. Some older Australians still refer to height in feet and inches informally, but metric is the official and legal standard.
Frequently Asked Questions
Why does Australia use metric instead of imperial?
Australia converted to metric in the 1970s for international trade alignment, scientific standardisation, and to modernise alongside most other countries. The UK (Australia's historical measurement reference) subsequently moved to metric for most purposes. Today, the US is the only major economy still primarily using imperial for everyday measurements.
Quick Celsius to Fahrenheit mental calculation?
Approximate formula: (°C × 2) + 30 ≈ °F. Example: 25°C ≈ (25×2)+30 = 80°F (exact: 77°F). For cold temperatures: 10°C ≈ 50°F (exact: 50°F — this one's exact!). For Australian everyday use, the approximation is close enough.
Are UK gallons and US gallons the same?
No — they're significantly different volumes. 1 UK (imperial) gallon = 4.546 litres. 1 US gallon = 3.785 litres (about 20% smaller). Australia never officially used gallons — all fuel has been sold in litres since metrication. When old Australian cars quote 'mpg' fuel economy, they typically mean UK mpg.
What is a 'stone' in Australian weight measurement?
A stone is 14 pounds or 6.35 kilograms — an old British imperial unit. It was used in Australia before metrication for body weight. Some older Australians still refer to their weight in stone informally, but medical, sports and official contexts all use kilograms.