Convert square km to acres
1 km² = 247.105 ac · 1 ac = 0.00404686 km² · Exact by definition
1 km² = 247.105 ac
The same value in other units
- square centimetre
- 10000000000 cm²
- square metre
- 1000000 m²
- hectare
- 100 ha
- square foot
- 10763900 ft²
Settings
Digits kept in the answer. Automatic keeps six, which hides floating-point noise without losing anything real.
Convert a whole list
Paste one conversion per line, written the way you would say it: "5 km to mi". Handy for a column copied out of a spreadsheet.
Area
square km to acres: conversion table
| square kilometre | acre |
|---|---|
| 1 km² | 247.105 ac |
| 2 km² | 494.211 ac |
| 3 km² | 741.316 ac |
| 5 km² | 1235.53 ac |
| 10 km² | 2471.05 ac |
| 20 km² | 4942.11 ac |
| 25 km² | 6177.63 ac |
| 50 km² | 12355.3 ac |
| 100 km² | 24710.5 ac |
| 250 km² | 61776.3 ac |
| 500 km² | 123553 ac |
| 1000 km² | 247105 ac |
| acre | square kilometre |
|---|---|
| 1 ac | 0.00404686 km² |
| 2 ac | 0.00809371 km² |
| 3 ac | 0.0121406 km² |
| 5 ac | 0.0202343 km² |
| 10 ac | 0.0404686 km² |
| 20 ac | 0.0809371 km² |
| 25 ac | 0.101171 km² |
| 50 ac | 0.202343 km² |
| 100 ac | 0.404686 km² |
| 250 ac | 1.01171 km² |
| 500 ac | 2.02343 km² |
| 1000 ac | 4.04686 km² |
How the conversion works
ac = km² × 247.10538
Both units are defined exactly, so the precision of the square km to acres result depends only on the number of decimal places you choose.
METHOD AND SOURCES
Where the conversion factors come from
Results are calculated from the unit definitions stored in the converter, not copied from a lookup table. For exact units, every value in the table follows from the same factor shown in the formula above.
- BIPM — SI Brochure
The official definitions of the International System of Units (SI).
- NIST SP 811 — Conversion factors
Conversion-factor tables for SI and non-SI units.
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