Converting Australia: distances, area, elevation, speed, temperature
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Straight-line distances: not the road you think
Boigu Island, the northernmost postcode locality in Australia, sits 2 978 kilometres from Canberra. That is 1 850 miles, but only if you measure as the crow flies. Road distances are longer, often much longer, so any conversion you do for a trip should start with the straight-line figure and then account for the route.
The measurement system in Australia
Australia uses the metric system (SI) in everyday life. You will see kilometres and km/h on roads, metres for shorter lengths, kilograms for mass, litres for volume, and degrees Celsius for temperature. The good news? Every conversion is a fixed ratio, and you can check the definitions from the BIPM - the international body that defines the SI units (metre, kilogram).
Reference speeds and temperatures
Speeds in Australia are posted in km/h. To get a feel, 100 km/h equals 62.1 mph. That is a common speed on open roads. For a quick mental check, 50 km/h is 31.1 mph, and 80 km/h is 49.7 mph. At the higher end, 120 km/h is 74.6 mph, while 30 km/h is 18.6 mph. Temperatures are just as straightforward: 20 °C is 68.0 °F, a mild day. A hot day at 30 °C is 86.0 °F, and body temperature is 37 °C, which is 98.6 °F. Freezing is 0 °C = 32.0 °F, and water boils at 100 °C = 212.0 °F. For a quick check, remember that -10 °C is 14.0 °F.
| Speed (km/h) | Speed (mph) | Temperature (°C) | Temperature (°F) |
|---|---|---|---|
| 30 | 18.6 | -10 | 14.0 |
| 50 | 31.1 | 0 | 32.0 |
| 80 | 49.7 | 20 | 68.0 |
| 100 | 62.1 | 30 | 86.0 |
| 120 | 74.6 | 37 | 98.6 |
| - | - | 100 | 212.0 |
Distances from the capital to the extremes
Canberra sits near the southeast. The straight-line distance to the southernmost postcode locality, Catamaran (7109), is 939 km, or 583 miles. The easternmost point, Suffolk Park (2481), is 847 km (527 mi) away. Go west, and the numbers jump. Useless Loop (6537) is 3 541 km (2 200 mi) from Canberra. The northernmost, Boigu Island (4875), is 2 978 km (1 850 mi) away. The span from north to south is 3 840 km (2 386 mi), and from east to west it is 3 959 km (2 460 mi). If you want to convert those distances yourself, use a converter: kilometres to miles (on converters.now).
Area and elevation: big numbers, simple factors
The total area of Australia is 7 692 024 square kilometres. That is 2 969 907 square miles. To get that, you multiply by 0.386102 or divide by 2.589988. For elevation, the highest point is Mawson Peak on Heard Island, at 2 745 metres. That is 9 006 feet. A converter: square kilometres to square miles (on converters.now) can help with area, and for height, a converter: metres to feet (on converters.now) is handy.
Checklist for converting correctly
- Always confirm whether the distance is straight-line or road distance; the numbers here are straight-line (great-circle), not road.
- Use the exact factor: 1 mile = 1.609344 km, and 1 km = 0.621371 mi.
- For elevation, 1 foot = 0.3048 m, so 1 m = 3.28084 ft.
- When converting area, 1 mi² = 2.589988 km², and 1 km² = 0.386102 mi².
- For temperature, multiply Celsius by 9/5 and add 32 to get Fahrenheit.
- For speed, multiply km/h by 0.621371 to get mph, or use the reference table above.
- If you need a precise conversion for a legal or scientific purpose, refer to the NIST - US government guide to converting between metric and US customary units.
Those conversions are not optional. Mixing up metres and feet on a hike could put you a thousand metres off. Swapping miles for kilometres on a road trip could land you hours away. The good news: every factor is fixed, and you can always double-check with a converter: Celsius to Fahrenheit (on converters.now) or a converter: km/h to mph (on converters.now). That is all you need.