Longitude Validator — Check Longitude Is Between −180 and 180
Free longitude validator for KML and map workflows: paste a decimal longitude and confirm it sits between −180 and 180 before it breaks a pin, Circle Generator ring, or Google Earth file. Catch lat/lon swaps early, copy a clean value, and pair with Latitude Validator or Point Validator.
Key features
- Valid range: −180 to 180 (inclusive)
- East is positive, west is negative in decimal form
- Rejects blank, text, or out-of-range numbers
- Use with Latitude Validator, then Point Validator
What Longitude Validator does
It checks that a single longitude value is numeric and within −180…180. Valid results are formatted for copy/paste into Workbench tools and KML workflows — without editing an entire coordinate pair.
Why local SEO and map teams use it
Spreadsheet exports often swap columns. A value like 17.4 pasted as “longitude” may still look numeric but sit in the wrong axis — validate both axes before generating coverage rings or Earth files.
KML order reminder
In KML, longitude comes first: lon,lat. This tool validates the longitude number alone so you can clean axes separately before Point Validator.
How to use this tool (best practice)
1) Paste longitude. 2) Validate. 3) Copy the clean decimal. 4) Run Latitude Validator on the other axis, then Point Validator on the pair. Next: Circle Generator or Destination Calculator.
Frequently asked questions
Is this Longitude Validator free?
Yes. It is free on GBP Local Ranker’s KML Workbench at /free-tools/kml-workbench/longitude-validator — no login required for basic use.
What range is valid?
Longitude must be between −180 and 180 inclusive. The Prime Meridian is 0; east is positive; west is negative.
Is 180 or −180 valid?
Yes — the antimeridian (±180) is accepted. Some viewers still need care when LineStrings cross the date line.
Is 181 valid?
No. Wrap or correct values into −180…180 before using them in KML.
India example?
Hyderabad is near longitude 78.35°E — enter 78.3489 as a positive decimal.
US west coast example?
Use a negative longitude, for example −122.4194 for San Francisco.
Does it convert DMS?
Not directly. Convert DMS to decimal with the DMS tool first, then validate the decimal longitude here.
What about E/W letters?
Use signed decimals (west is negative), or convert labeled DMS via the DMS tool before validating.
How does this differ from Point Validator?
Longitude Validator checks one axis. Point Validator checks a full lat,lon pair and can show a map pin.
Where is the full KML Workbench suite?
Open All KML Workbench Tools at /free-tools/kml-workbench for latitude validator, point validator, circle generator, and more.