Square Kilometres to Square Metres Converter
Convert square kilometres to square metres — multiply by a million. Results update as you type; exact factors shown.
One square kilometre is 1,000,000 square metres — see the exact factor, not a rounded rule of thumb.
How the square kilometres to square metres converter works
Areas convert through the square metre. Because the inch is exactly 25.4 mm, a square foot is exactly 0.09290304 m², an acre (43,560 square feet) is exactly 4,046.8564224 m² and a square mile (640 acres) is 2,589,988.110336 m². A hectare is 10,000 m² by definition.
Australia is fully metric under the National Measurement Act 1960; imperial units appear only in trade with the US and in older documents.
Common area conversions
| From | To | Units |
|---|---|---|
| 0.001 km² | 1,000 m² | square kilometres to square metres |
| 0.01 km² | 10,000 m² | square kilometres to square metres |
| 0.1 km² | 100,000 m² | square kilometres to square metres |
| 0.5 km² | 500,000 m² | square kilometres to square metres |
| 1 km² | 1,000,000 m² | square kilometre to square metres |
| 2 km² | 2,000,000 m² | square kilometres to square metres |
| 5 km² | 5,000,000 m² | square kilometres to square metres |
| 10 km² | 10,000,000 m² | square kilometres to square metres |
| 25 km² | 25,000,000 m² | square kilometres to square metres |
| 100 km² | 100,000,000 m² | square kilometres to square metres |
| 500 km² | 500,000,000 m² | square kilometres to square metres |
| 1,000 km² | 1,000,000,000 m² | square kilometres to square metres |
Units in this converter and their exact factors
| Unit | Symbol | One unit in square metres |
|---|---|---|
| square millimetre | mm² | 0.000001 square metre |
| square centimetre | cm² | 0.0001 square metre |
| square metre | m² | 1 square metre |
| hectare | ha | 10,000 square metre |
| square kilometre | km² | 1,000,000 square metre |
| square inch | in² | 0.00064516 square metre |
| square foot | ft² | 0.09290304 square metre |
| square yard | yd² | 0.83612736 square metre |
| acre | ac | 4,046.8564224 square metre |
| square mile | mi² | 2,589,988.110336 square metre |
FAQFrequently asked questions about area conversion
How many square metres in a square kilometre?
One million.
What is 0.01 km²?
10,000 m², which is one hectare.
How large is a typical city?
Central Paris is about 105 km², or 105 million square metres.
Why does the factor square?
Because both dimensions scale. A thousand metres by a thousand metres is a million square metres.
What is 1 km² in acres?
About 247.1 acres.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Measurement Institute (NMI) — Australia's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.