Hectares to Square Kilometers Converter

Hectares to Square Kilometers

Convert hectares (ha) to square kilometers (km²). Both measure surface measurement, and the conversion comes up in real estate, farming, construction work.

The Formula

`` square kilometers = hectares × 0.01 hectares = square kilometers × 100 `

One hectare is 0.01 square kilometers, and one square kilometer is 100 hectares.

Conversion Table

Hectares	Square Kilometers
1 ha	0.01 km²
2 ha	0.02 km²
5 ha	0.05 km²
10 ha	0.1 km²
25 ha	0.25 km²
50 ha	0.5 km²
100 ha	1 km²
500 ha	5 km²
1,000 ha	10 km²

The Other Direction

Square Kilometers	Hectares
1 km²	100 ha
2 km²	200 ha
5 km²	500 ha
10 km²	1,000 ha
25 km²	2,500 ha
50 km²	5,000 ha
100 km²	10,000 ha
500 km²	50,000 ha
1,000 km²	100,000 ha

What Each Unit Is

Hectares (ha) — exactly 10,000 square metres, or a square 100 m on each side. The metric land unit, introduced with the metric system for agriculture and forestry.

Square Kilometers (km²) — one million square metres. The metric unit for regions, cities and land cover.

A Sense of Scale

• A hectare is about 2.47 acres
• A rugby pitch is roughly 1 hectare
• Central Park is 3.4 km²
• Manhattan is 59 km²
• Greater London is 1,572 km²

Precision

The factor 0.01 is rounded. For engineering work carry more digits than the table above, and round only at the end — rounding at each step compounds.

In Code

`javascript const hectareToSquareKilometer = (value) => value * 0.01; ``

Where This Conversion Comes Up

• Real estate
• Farming
• Construction
• Landscaping
• Flooring

How Many Decimals Do You Need?

Rounding the factor costs accuracy, and how much depends on the factor. Converting 137 ha with the factor truncated at each decimal place:

Decimals kept	Factor	137 ha becomes	Error
0	0	0	100.0000%
1	0	0	100.0000%
2	0.01	1.37	—
3	0.01	1.37	—
4	0.01	1.37	—

A rule that holds for any conversion: round once, at the end. Rounding the factor and then multiplying compounds the error through every subsequent calculation, while carrying full precision and rounding the final answer does not.

The right number of significant figures is set by your input, not by the converter. If you measured hectares to three significant figures, the answer in square kilometers is only good to three — writing more digits claims precision the measurement never had.

Other Conversions From Hectares

The same value in every other unit this converter supports for area:

From	To	Unit
1 ha	10,000 m²	Square Meters
1 ha	107,639.1 ft²	Square Feet
1 ha	11,959.9 yd²	Square Yards
1 ha	0.00386102 mi²	Square Miles
1 ha	2.47105 ac	Acres

Chaining conversions works — hectares to metres to feet gives the same answer as hectares to feet — but each step rounds, so a chain of three conversions carries three roundings. Convert directly where a direct factor exists.