Length Converter
Type a number in Value and pick the source unit in From (m, km, cm, or mi). The tool converts that amount into all four units and lists each result on its own line as you edit.
Updated 2026-08-03 · units
m: 1
km: 0.001
cm: 100
mi: 0.000621371
About this tool
This length converter treats meters as the base unit. Your value is divided by the From factor to get meters, then multiplied into m, km, cm, and mi. Factors are m=1, km=0.001, cm=100, and mi≈0.000621371 relative to meters. Non-numeric input shows Enter a number instead of fake lengths.
How to use
- Open the converter: Load this page so the Value field and From dropdown appear.
- Enter the amount: Type the length number (default sample is 1).
- Pick the source unit: Select m, km, cm, or mi in From to match what you typed.
- Read all units: Scan the result lines such as m: … and mi: …, or fix the value if you see Enter a number.
Common use cases
- Convert a map distance in miles into kilometers for a plan.
- Switch a product size from centimeters to meters before ordering.
- Cross-check homework or travel notes across metric and imperial length.
Tips
- Choose the unit that matches your input in From before reading the other lines.
- Use a plain number; letters or blank fields trigger Enter a number.
FAQ
Which units are supported?
Meters (m), kilometers (km), centimeters (cm), and miles (mi).
Do I need a Convert button?
No. Results refresh as soon as Value or From changes.
What does Enter a number mean?
The Value field was empty or not a finite number, so conversion is paused.
Is my input sent to a server?
Conversion runs in your browser; you do not need an account.