km² to mi²
Convert km² to mi². Enter a value and view the calculation method, examples and conversion table.
Area converter
km² to mi² formula
The calculator converts the input to the category's reference unit, then divides by the target unit's factor.
Result = input × source factor ÷ target factor
1 × (1,000,000 ÷ 2,589,988.11034) ≈ 0.386102
Worked example: 1 Square kilometres ≈ 0.386102 Square miles
Auto mode preserves significant digits for small values; manual mode rounds to the selected decimal places. ≈ means approximate; < means below the display limit. Extreme values use × 10ⁿ. Calculations are rounded only for display.
km² to mi² conversion table
| Square kilometres | Square miles |
|---|---|
| 1 Square kilometres | ≈ 0.386102 Square miles |
| 2 Square kilometres | ≈ 0.772204 Square miles |
| 5 Square kilometres | ≈ 1.930511 Square miles |
| 10 Square kilometres | ≈ 3.861022 Square miles |
| 20 Square kilometres | ≈ 7.722043 Square miles |
| 50 Square kilometres | ≈ 19.305108 Square miles |
| 100 Square kilometres | ≈ 38.610216 Square miles |
| 250 Square kilometres | ≈ 96.52554 Square miles |
| 500 Square kilometres | ≈ 193.051079 Square miles |
| 1,000 Square kilometres | ≈ 386.102159 Square miles |
Definitions and assumptions
Area factors are expressed relative to square metres. A length conversion factor is squared for area: one square foot is 0.09290304 square metres. Land-survey units use the conventions listed for each unit.
How to use this calculator
- Enter the value you want to convert.
- Choose the source and target units, then adjust the display precision if needed.
- Read the result. Select Convert to open a page for this value, or use the table below.
Frequently asked questions
how many mi² is 1 km²?
1 Square kilometres ≈ 0.386102 Square miles. Auto mode preserves significant digits for small values; manual mode rounds to the selected decimal places. ≈ means approximate; < means below the display limit. Extreme values use × 10ⁿ. Calculations are rounded only for display.
how to convert km² to mi²?
The calculator converts the input to the category's reference unit, then divides by the target unit's factor. 1 × 0.386102158542 ≈ 0.386102 Square miles. Use the source and target factors shown in the formula. The worked example uses the value on this page, and the table provides other common values.
Can I use a length conversion factor directly for area?
No. Square the length factor when both dimensions change. For example, because one foot is 0.3048 metres, one square foot is 0.3048² square metres.
Why is the displayed result rounded?
Auto mode preserves significant digits for small values; manual mode rounds to the selected decimal places. ≈ means approximate; < means below the display limit. Extreme values use × 10ⁿ. Calculations are rounded only for display.
What input range can I use?
This calculator accepts non-negative values up to 1 trillion, with up to 8 decimal places. It does not calculate signed vectors or calendar date intervals.
Why is a unit unavailable?
A conversion is unavailable when a verified unit definition or a current exchange-rate value has not been configured. The tool does not invent a coefficient.
Sources and methodology
Methods and sources · Content revised
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