Authoritative definitions of the International System of Units and SI prefixes.
Unit converters
Area
Enter your values below for a clear, instant result.
AreaInstant result
Decimals
Formula result = input × 1 ÷ 1000000. 1 m² = 0 km²
Common examples
One value, several units
Square kilometres0 km²
Square centimetres10,000 cm²
Hectares0.0001 ha
Acres0.0002 ac
Square feet10.7639 ft²
Square inches1,550.0031 in²
Square miles0 mi²
Conversion table
| m² | km² |
|---|---|
| 1 m² | 0 km² |
| 2 m² | 0 km² |
| 5 m² | 0 km² |
| 10 m² | 0 km² |
| 25 m² | 0 km² |
| 50 m² | 0.0001 km² |
| 100 m² | 0.0001 km² |
Conversion chart
1 m²0 km²
5 m²0 km²
10 m²0 km²
25 m²0 km²
50 m²0.0001 km²
Worked example
1 hectare equals 10,000 square metres.
Unit definition
Square metres (m²) One square metres equals 1 square metre.
Unit history
Square metres is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert m² to square metre.
3. Convert the base value to km² and apply your display precision.
Understand the result before using it
Area changes a two-dimensional area between metric, imperial, US customary, and land-measure units. The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 1 ÷ 1000000
Assumptions
- The source and target selections represent the same physical quantity or supported notation.
- The entered value is valid for the selected relationship and uses the source unit shown.
- Published unit definitions and conventional conversion factors apply under their stated conditions.
Worked example
1 hectare equals 10,000 square metres.
When to use it
Good uses
- Translate a area value found in a document, specification, recipe, or measurement.
- Compare values reported in different unit systems.
- Check a manual conversion and control the displayed precision.
Limitations
Common mistakes to avoid
- Do not apply a linear length factor directly to area; the length factor must be squared.
- Do not add meaningful digits beyond the precision of the original measurement.
- Confirm regulated, safety-critical, laboratory, and contractual values against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
What does the Area converter do?
Area changes a two-dimensional area between metric, imperial, US customary, and land-measure units. It does not change the physical quantity represented by the input.
What formula does the Area converter use?
result = input × 1 ÷ 1000000
Why can a Area converter result be rounded?
UnitMora calculates with JavaScript double-precision numbers, then formats the result using your selected decimal or significant-figure setting. The unrounded value may contain more digits than are displayed.
What is the most common area conversion mistake?
Do not apply a linear length factor directly to area; the length factor must be squared.
Clear answers, without the guesswork
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