Hectares to Square Kilometers Converter

How it is calculated

The converter works in either direction, chosen with the direction setting. Hectares to square kilometres: km² = ha × 0.01. Square kilometres to hectares: ha = km² × 100. The relationship follows from 1 ha = 10,000 m² and 1 km² = 1,000,000 m², so a square kilometre holds exactly 100 hectares. Hectare results are rounded to two decimals and square-kilometre results to four, because the km² figures are usually small. Besides the converted value, the tool prints the rate used and the number you entered with its unit as a check. Any value other than the hectare-to-km² setting is treated as km² to hectares. The tool does not reject zero or negative numbers, but an area should not be negative.

Common mistakes

• Leaving the direction on hectares to km² when the number you typed is already in km², which shrinks the value by 100 instead of enlarging it.
• Dividing by 1,000 or 10,000 from memory instead of 100; the factor between these two units is 100 because a hectare is a 100 m by 100 m square, not a kilometre fraction.
• Typing square metres as if they were hectares; 1 ha is 10,000 m², and this tool does not accept m².
• Reading the rate line as a rule for both directions; it shows only the factor of the direction you chose.
• Expecting four decimals in a hectare result; hectares are shown with two decimals and square kilometres with four.