Length Converter
Convert between millimeters, meters, feet, miles, and more.
About this converter
Length is the unit category most people convert without thinking about it — recipe measurements, DIY projects, or just figuring out how many feet a meter actually is. This converts between metric units (millimeters through kilometers) and imperial/US units (inches through miles) instantly as you type.
Frequently asked questions
- How precise are the conversions?
- Conversions use the internationally standardized exact definitions (e.g. 1 inch = exactly 0.0254 meters), not rounded approximations, so results are as precise as floating-point math allows.
- Which is bigger, a mile or a kilometer?
- A mile (1.609 km) is longer than a kilometer — you'll see this directly when you convert between them.