Length Converter
Convert cm to inches, meters to feet, km to miles, and more. Supports all metric and imperial length units.
Our free Length Converter instantly converts between all common metric and imperial length units: millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles. Whether you need to convert your height from centimeters to feet and… Use the fields above to enter values and get an instant answer. All processing happens on your device.
About This Calculator
Our free Length Converter instantly converts between all common metric and imperial length units: millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles. Whether you need to convert your height from centimeters to feet and inches, check a European product dimension in inches, convert a road distance from kilometers to miles, or translate a blueprint measurement for an international client, this tool gives you an accurate result with a single click. All conversion factors follow international standards (1 inch = exactly 2.54 cm).
How It Works
Enter the length value, select the source unit, and choose the target unit. The calculator multiplies by the appropriate conversion factor. Key factors: 1 inch = 2.54 cm, 1 foot = 30.48 cm, 1 yard = 0.9144 m, 1 mile = 1.60934 km, 1 meter = 3.28084 feet. All factors are internationally standardized definitions, making the conversions exact (not approximations).
How to Use
- Enter your values in the calculator fields above
- Click the calculate button or let the calculator auto-update
- Review your results instantly
- Adjust values as needed to see different scenarios
Frequently Asked Questions
How do I convert centimeters to inches?
Divide the centimeter value by 2.54. For example, 170 cm / 2.54 = 66.93 inches, which is about 5 feet 7 inches. This calculator does the math for you instantly.
How do I convert km to miles?
Multiply kilometers by 0.621371. For example, 10 km = 6.21 miles. A quick mental shortcut: multiply km by 0.6 for a rough estimate. The converter provides the precise result.
What is the difference between metric and imperial length units?
Metric lengths (mm, cm, m, km) are based on powers of 10 — easy to scale up and down. Imperial lengths (inches, feet, yards, miles) use non-decimal ratios (12 inches per foot, 3 feet per yard, 5,280 feet per mile). Most of the world uses metric; the US, UK (partially), and a few other countries still use imperial for everyday purposes.
How do I convert feet and inches to centimeters?
Convert everything to inches first (feet x 12 + inches), then multiply by 2.54. For example, 5'10" = 70 inches x 2.54 = 177.8 cm. This is useful for converting heights on international forms.
Are these conversions exact?
Yes. The inch is defined as exactly 2.54 cm by international agreement (since 1959). All other conversions derived from this definition are equally exact. The converter shows results with appropriate decimal precision.
Why Use Our Free Length Converter Online?
Our Length Converter uses standard formulas and works in your browser—no install or sign-up. Use it for homework, travel, or everyday conversions. Results are instant and we don't collect your inputs. Explore our other math and unit converters from the link below.