Square Kilometers to Square Miles Converter

How Does It Work?

This calculator converts square kilometers to square miles and the reverse.

Type a value in either field. The other field updates with the result.

The math uses precise constants for accuracy.

One square kilometer equals 0.386102159 square miles.

One square mile equals 2.58998811 square kilometers.

Simple Setup

Use the two input fields to enter your area.

Pick the field that matches your starting unit.

• Square Kilometers Enter an area in square kilometers, decimals allowed.
• Square Miles Enter an area in square miles, decimals allowed.

For real area, use zero or positive numbers only.

After first mention, you may see km² and mi² for short forms.

Why Use This Converter?

It gives fast and reliable area conversion for daily work.

• Check land area for a city or county.
• Prepare numbers for research and reports.
• Estimate land sizes in real estate work.

Use it for square kilometers to square miles conversions at any time.

Features That Matter

• Two way input and output.
• Accurate constants for precise and repeatable math.
• Clear number formatting with commas and decimals.
• Supports tiny fractions and very large areas.
• Decimal input for fine control.

Notes and limits help you get the best results.

• Numbers use United States style, commas and a period as the decimal point.
• Display rounding follows the rules in the steps below.

How to Use This Tool

Step 1: Enter Your Data

Choose the field that matches your starting unit.

Enter the area value as a plain number.

Step 2: Watch the Calculation

The other field fills with the converted value instantly.

Large values show two decimals.

Values from one to under one thousand show four decimals.

Values under one show six decimals.

Step 3: Get Your Answer

Use the converted number in your task.

Always include the unit with the value.

For example, 50 square kilometers equals 19.3051 square miles.

For example, 10 square miles equals 25.8999 square kilometers.

Final Thoughts

This square kilometers to square miles converter keeps area math clear and quick.

Type a value, read the result, continue your work with confidence.

Related tools worth a look include Square miles to square kilometers and Square root.