How many acres are in one square kilometer?

One square kilometer equals exactly 247.105381 acres. This comes from the definition: 1 km = 1000 m, so 1 km² = 1,000,000 m². One acre = 4046.8564224 m², giving 1,000,000 ÷ 4046.856 ≈ 247.105 acres.

How many hectares are in one square kilometer?

Exactly 100 hectares. One hectare is defined as 10,000 m², and one km² is 1,000,000 m², so 1,000,000 ÷ 10,000 = 100.

What is the difference between a square kilometer and a square mile?

One square mile equals 2.58999 km². Conversely, 1 km² ≈ 0.386102 square miles. Square miles are used primarily in the US and UK; square kilometers are the international standard.

Is this converter accurate enough for legal land documents?

The tool uses the exact SI-defined conversion factors and displays up to 6 significant figures, which is sufficient for most practical purposes. For legally binding documents, always verify with a licensed surveyor.

Can I convert from acres back to square kilometers?

Yes. Use the "From" dropdown to select Acres, then type your acreage. All other units — including km² — will update immediately.

Square Kilometers to Acres Converter

Name: Square Kilometers to Acres Converter
Availability: InStock
Author: Nham Vu

Enter a value in square kilometers and instantly see the equivalent in acres, hectares, square miles, and more.

Enter Area Value

Value From unit

Quick reference: 1 km² = 247.105 acres = 100 ha = 0.3861 mi²

Conversion Results Click any value to copy

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Summary

Enter a value in square kilometers and instantly see the equivalent in acres, hectares, square miles, and more.

How it works

Type a value in square kilometers into the input field.
The tool multiplies your value by the exact conversion factor for each unit.
Results for acres, hectares, square miles, and square feet appear instantly.
Click any result field to copy the value to your clipboard.
Switch the input unit to convert from acres or hectares back to sq km.

Use cases

Convert land purchase listings between metric and imperial units.
Compare national park or farm sizes across different measurement systems.
Check geographic data (country areas, watersheds) in familiar units.
Convert satellite or GIS data from km² to acres for US land reports.
Verify real estate deed figures when units differ from local standards.
Academic geography and earth science calculations.

Frequently Asked Questions

Last updated: 2026-06-09 · Reviewed by Nham Vu