Length Validator — Convert Meters, KM, Miles, Feet & NM
Free length validator and unit converter for KML and map workflows: enter a distance and convert across meters, kilometers, miles, feet, and nautical miles. Sanitize radius and range values before Circle Generator, Destination Calculator, or RF Leg — meters are the internal base.
Key features
- Non-negative lengths only (zero allowed; negatives rejected)
- Convert any unit into meters, km, miles, feet, and nautical miles
- Meters are the internal conversion base
- Copy a single unit into Circle Generator or Destination Calculator
What Length Validator does
It validates a numeric length, converts it through a meters base using standard factors, and shows every supported unit at once so you can copy the value your next Workbench tool expects.
Why local SEO and map teams use it
Briefs often mix “5 km coverage” with “1 mile radius.” Convert once here, then paste a consistent unit into Circle Generator rings, destination distances, or RF Leg radii.
Nautical miles included
Aviation and marine-style workflows still use NM. The converter includes nautical miles alongside statute miles, feet, meters, and kilometers.
How to use this tool (best practice)
1) Enter the numeric value. 2) Pick the source unit. 3) Convert / validate. 4) Copy meters or km into Circle Generator or Destination Calculator. Related: Distance Calculator measures a two-point span.
Frequently asked questions
Is this Length Validator free?
Yes. It is free on GBP Local Ranker’s KML Workbench at /free-tools/kml-workbench/length-validator — no login required for basic use.
Which units are supported?
Meters, kilometers, miles, feet, and nautical miles.
Can length be zero?
Zero is allowed for validation, but Circle Generator and Destination usually need a positive distance or radius.
How exact are conversions?
Standard factors from a meters base are used (for example 1 mile = 1609.344 m, 1 NM = 1852 m).
Does it parse text like “5 km”?
Enter the numeric value and choose the unit from the dropdown — mixed text strings are not parsed.
Are negative lengths allowed?
No. Distances and radii cannot be negative.
What should I paste into Circle Generator?
Copy the meters or kilometers row that matches your Circle Generator radius field, then generate the ring.
Miles vs nautical miles?
Miles are statute miles (1609.344 m). Nautical miles are 1852 m — common in aviation and marine contexts.
Is this the same as Distance Calculator?
No. Distance Calculator measures between two lat/lon pins. Length Validator converts a length you already have into other units.
Where is the full KML Workbench suite?
Open All KML Workbench Tools at /free-tools/kml-workbench for circle generator, destination, distance, and more.