What is a square kilometer?
Definition
km²
The square kilometer (km²) is a metric unit of area equal to one million square meters.
Unit system
Metric
Convert square kilometers
All area units
| Unit | Symbol | System |
|---|---|---|
| square millimeters | mm² | Metric |
| square centimeters | cm² | Metric |
| square meters | m² | Metric |
| hectares | ha | Metric |
| square kilometers | km² | Metric |
| square inches | in² | Imperial / US |
| square feet | ft² | Imperial / US |
| square yards | yd² | Imperial / US |
| acres | ac | Imperial / US |
| square miles | mi² | Imperial / US |