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Acres to Square Kilometers (ac to km²) Converter

1 acre (ac) = 0.00404686 square kilometers (km²). To convert acres to square kilometers, multiply by 0.00404686: 5 ac × 0.00404686 = 0.0202343 km². Also searched as acres to square kilometres.

1 ac = 0.0040468564 km²
Convert the other way: Square Kilometers to Acres

Quick facts

How to convert acres to square kilometers

  1. Take the value in acres.
  2. Multiply it by 0.00404686 (the number of square kilometers in one acre).
  3. Round the result to the precision you need.
km² = ac × 0.00404686

Worked example (a small farm): 5 ac × 0.00404686 = 0.0202343 km².

To convert square kilometers back to acres, multiply by 247.105, or divide by 0.00404686.

Source: NIST SP 811 (2008). Marla and kanal use the Punjab standard stated in their definitions; local sizes can differ.

Acres to Square Kilometers conversion table

Acres to Square Kilometers conversion table
Acres [ac]Square Kilometers [km²]
0.01 ac0.0000404686 km²
0.1 ac0.0004046856 km²
1 ac0.0040468564 km²
2 ac0.0080937128 km²
3 ac0.0121405693 km²
5 ac0.0202342821 km²
10 ac0.0404685642 km²
20 ac0.0809371284 km²
50 ac0.2023428211 km²
100 ac0.4046856422 km²
1000 ac4.0468564224 km²

ac to km² chart from 1 to 100

Square Kilometers to Acres conversion table

Square Kilometers to Acres conversion table
Square Kilometers [km²]Acres [ac]
0.01 km²2.4710538147 ac
0.1 km²24.7105381467 ac
1 km²247.1053814672 ac
2 km²494.2107629343 ac
3 km²741.3161444015 ac
5 km²1235.5269073358 ac
10 km²2471.0538146717 ac
20 km²4942.1076293433 ac
50 km²12355.2690733583 ac
100 km²24710.5381467165 ac
1000 km²247105.3814671653 ac

Acres vs Square Kilometers

AcreSquare Kilometer
Symbolackm²
Equals1 ac = 0.00404686 km²1 km² = 247.105 ac

What is an acre?

A US customary and imperial unit historically based on the area a yoke of oxen could plow in a day. Used in the US and UK for land and real estate.

What is a square kilometer?

The area of a square with 1-kilometer sides. Used for city, country, and large geographic areas.

Frequently asked questions

How many square kilometers are in an acre?

There are 0.00404686 square kilometers in 1 acre (1 ac = 0.0040468564 km²).

How many acres are in a square kilometer?

There are 247.105 acres in 1 square kilometer (1 km² = 247.1053814672 ac).

How do I convert acres to square kilometers?

Multiply the number of acres by 0.00404686. For example, 10 ac × 0.00404686 = 0.0404686 km². To convert back, multiply by 247.105.

What is 10 ac in square kilometers?

10 ac = 0.0404686 km².

What is 100 ac in square kilometers?

100 ac = 0.404686 km².

Is the conversion exact?

Yes. The factor comes from the official definitions of both units (NIST SP 811 (2008). Marla and kanal use the Punjab standard stated in their definitions; local sizes can differ). Results are shown to up to 10 decimal places; round them to suit your purpose.

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Reviewed by

Dr. Muhammad Amjad Khadim PhD Mathematics

Dr. Muhammad Amjad Khadim holds a PhD in Mathematics. He writes and reviews the guides on pakmath.com and checks every formula, conversion factor and worked example against published standards and official guidance before it goes live. Spotted an error? Tell us and it will be corrected.

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First published 28 October 2026 · Last reviewed 5 November 2026