Authoritative definitions of the International System of Units and SI prefixes.
Unit conversion
Square kilometres to Square metres Converter
1 km² = 1,000,000 m². Enter a value to convert km² to m², then use the formula and table below. Displayed digits may be rounded.
AreaInstant result
Decimals
Formula result = input × 1000000 ÷ 1. 1 km² = 1,000,000 m²
Nonzero results too small for the selected decimal places use scientific notation.
Nonzero results too small for the selected decimal places use scientific notation.
Common examples
One value, several units
Square metres1,000,000 m²
Square centimetres10,000,000,000 cm²
Hectares100 ha
Acres247.1054 ac
Square feet10,763,910.4167 ft²
Square inches1,550,003,100.0062 in²
Square miles0.3861 mi²
Conversion table
| km² | m² |
|---|---|
| 1 km² | 1,000,000 m² |
| 2 km² | 2,000,000 m² |
| 5 km² | 5,000,000 m² |
| 10 km² | 10,000,000 m² |
| 25 km² | 25,000,000 m² |
| 50 km² | 50,000,000 m² |
| 100 km² | 100,000,000 m² |
Conversion chart
1 km²1,000,000 m²
5 km²5,000,000 m²
10 km²10,000,000 m²
25 km²25,000,000 m²
50 km²50,000,000 m²
Worked example
1 km² = 1,000,000 m². Apply the selected conversion formula to other input values.
Unit definition
Square kilometres (km²) One square kilometres equals 1,000,000 square metre.
Unit history
Square kilometres 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 km² to square metre.
3. Convert the base value to m² and apply your display precision.
Understand the result before using it
Square kilometres to Square metres converts a value measured in Square kilometres (km²) into the equivalent value in Square metres (m²). 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 × 1000000 ÷ 1
Assumptions
- Square kilometres and Square metres represent the same area quantity.
- The input is expressed in km²; the output is expressed in m².
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 km² = 1,000,000 m². For another value, apply the same relationship and round only to the precision your source measurement supports.
When to use it
Good uses
- Read a km² measurement in a document that expects m².
- Compare a square kilometres value with a value reported in square metres.
- Check the km² to m² arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Do not apply a linear length factor directly to area; the length factor must be squared.
- Round the output to a precision justified by the original measurement.
- Verify safety-critical, regulated, laboratory, and contractual conversions 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
How do I convert Square kilometres to Square metres?
result = input × 1000000 ÷ 1. Input is in km²; result is in m². 1 km² = 1,000,000 m². The displayed digits may be rounded.
What is 1 km² in m²?
1 km² = 1,000,000 m². The displayed digits may be rounded.
Can I reverse the km² to m² conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts m² back to km².
Is the Square kilometres to Square metres result exact?
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.