Square Miles to Square Kilometers Converter
mi² → km² · 📐 Area
1 Square Miles = 2.589988 Square Kilometers
How to convert Square Miles to Square Kilometers
To convert Square Miles to Square Kilometers, multiply the value in Square Miles by 2.589988. For example, 5 mi² = 12.94994 km².
Going from Square Miles to Square Kilometers means applying a fixed conversion factor: one Square Miles (mi²) is exactly 2.589988 Square Kilometers (km²). Type any number into the converter above and the equivalent updates instantly, or use the reference table for quick lookups.
Area conversions are vital for real estate, agriculture, landscaping, flooring, and construction. They scale as the square of length units, which is why the numbers can seem surprisingly large or small at first glance.
Understanding Square Miles and Square Kilometers
Square meters and square feet are the everyday units for rooms, homes, and building plots. Acres and hectares measure land — an acre (about 4,047 m²) is the traditional measure in the US and UK, while a hectare (10,000 m²) is the metric standard used worldwide for farmland. One hectare equals about 2.47 acres, a ratio worth memorizing for anyone working with land.
How accurate is this conversion?
Because area is length squared, the conversion factors are the square of the corresponding length factors. For example, since 1 foot = 0.3048 meters exactly, 1 square foot = 0.3048² = 0.09290304 square meters exactly.
All conversion factors on ClearUnits are based on internationally recognised standards (the International System of Units, SI, and official definitions). Factors are reviewed for accuracy and the calculator uses full-precision values, rounding only the displayed result.
Quick reference: common Square Miles to Square Kilometers values
The most frequently searched conversions are 1 Square Miles = 2.589988 Square Kilometers, 5 Square Miles = 12.94994 Square Kilometers, 10 Square Miles = 25.89988 Square Kilometers, and 100 Square Miles = 258.9988 Square Kilometers. The full table further down covers every common value, and the calculator handles any number you need in between.
Pro tip: When estimating flooring or paint, convert to a single unit system first, then add a 5-10% waste allowance. Converting back and forth mid-calculation is where most measurement errors creep in.
Square Miles to Square Kilometers — Conversion Table
| Square Miles (mi²) | Square Kilometers (km²) |
|---|---|
| 0.1 mi² | 0.2589988 km² |
| 0.25 mi² | 0.647497 km² |
| 0.5 mi² | 1.294994 km² |
| 1 mi² | 2.589988 km² |
| 2 mi² | 5.179976 km² |
| 5 mi² | 12.94994 km² |
| 10 mi² | 25.89988 km² |
| 25 mi² | 64.7497 km² |
| 50 mi² | 129.4994 km² |
| 100 mi² | 258.9988 km² |
| 250 mi² | 647.497 km² |
| 500 mi² | 1,294.994 km² |
| 1000 mi² | 2,589.988 km² |