Square kilometers to Square meters Converter

When to use square kilometers → square meters

Square kilometers to square meters multiplies by 1,000,000. A 2.5 km² nature reserve is 2,500,000 m². The conversion is exact but the numbers get unwieldy fast, which is why intermediate land areas are usually quoted in hectares instead (1 km² = 100 ha). Go all the way down to m² only when a calculation demands it — density figures, for instance, are usually per km², not per m².

Urban density calculations — population per square kilometer at the city level, but building footprints and public space at the square-meter level — require moving between the two constantly: 0.5 km² is 500,000 m², 1.2 km² is 1,200,000 m², and 0.05 km² is 50,000 m². Because the factor is a flat million, planners typically keep figures in km² for city-wide comparisons and only expand to square meters when detailing a specific district or site.

How to convert square kilometers to square meters

1. 1

   Take your value

   Start with your value in square kilometers.

2. 2

   Multiply by 1000000

   Multiply the square kilometer value by 1000000. This is the exact conversion factor from square kilometers to square meters.

3. 3

   Read the result

   The product is your value in square meters. For example, 5 km² × 1000000 = 5000000 m².

Conversion formula

The exact factor from square kilometers to square meters is 1000000.

Square meters = Square kilometers × 1000000

Square kilometers to Square meters conversion table

Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.

Real-world reference

Manhattan is about 59 km². Lake Geneva is about 580 km². In square meters, that gives you: 1 km² = 1000000 m², 10 km² = 10000000 m², 100 km² = 100000000 m².

Frequently asked questions

How many square meters are in 1 square kilometer?

1 square kilometer equals 1000000 square meters.

How do I convert square kilometers to square meters?

Multiply the square kilometer value by 1000000. So x km² × 1000000 = the equivalent in m².

What is 5 square kilometers in square meters?

5 square kilometers equals 5000000 square meters.

What is 10 square kilometers in square meters?

10 square kilometers equals 10000000 square meters.

What is 100 square kilometers in square meters?

100 square kilometers equals 100000000 square meters.

How do I convert back from square meters to square kilometers?

Multiply the square meter value by 1.0000 × 10^−6. For example, 1 m² = 1.0000 × 10^−6 km².

Is the square kilometer bigger than the square meter?

Yes. 1 square kilometer is larger than 1 square meter — specifically 1000000 times larger.

Are these conversion factors exact?

The factor is derived directly from the SI definitions of square kilometer and square meter; the displayed value is rounded for readability, and the browser computes using IEEE 754 double-precision arithmetic.

About the square kilometer and the square meter

Sources

• NIST Special Publication 811 — Guide for the Use of the International System of Units (SI)
• BIPM — SI Brochure (9th edition)
• Reverse: m² to km²
• All area converters