Length Converter
Enter any length measurement and instantly convert between metric and imperial units. All conversions use the exact internationally defined factors for precise results.
Base unit for internal conversion: meters.
Frequently Asked Questions
How accurate is this converter?+
It uses the exact internationally defined conversion factors (e.g. 1 inch = exactly 0.0254 meters), so results are precise to the decimal places shown. No rounding is introduced in the conversion itself.
Can I convert feet directly to yards without going through meters?+
Yes. Pick any two units in the From/To fields and the converter handles it. Internally it passes through meters as a base unit, but the result is mathematically identical to a direct conversion since all factors are exact.
What is the difference between metric and imperial length units?+
Metric units (mm, cm, m, km) are based on powers of 10, making arithmetic simple. Imperial units (inches, feet, yards, miles) use irregular ratios (12 inches per foot, 3 feet per yard, 5280 feet per mile). Both systems are exact and well-defined, but metric is the global scientific standard.
Why do some conversions produce long decimal numbers?+
When you convert between metric and imperial, the exact result is often irrational in the target system. For example, 1 meter = 39.3700787... inches (a repeating decimal). The converter shows enough digits for practical precision, typically 4-6 decimal places.
Is a nautical mile included in this converter?+
No. This converter covers the most common everyday length units. A nautical mile (1,852 meters exactly) is a specialized navigation unit. For standard land distances, use miles or kilometers.