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UTM Coordinate Conversion Calculator

Work out utm coordinate conversion instantly with clear inputs, formula shown and shareable results.

About UTM Coordinate Conversion Calculator

UTM divides the world into 60 six-degree zones numbered eastward from the antimeridian, each with its own transverse Mercator projection centred on a meridian at zone middle. London at -0.128 degrees falls in zone 30, central meridian -3, band U. Easting is measured from a 500,000 m false origin at that meridian with a 0.9996 scale factor.

Formulas

Zone number

zone = floor((longitude + 180) / 6) + 1

Central meridian

CM = (zone - 1) x 6 - 180 + 3

Worked example

With the default values below, UTM Coordinate Conversion Calculator returns UTM Zone of 30. Change any input above and every figure here is recalculated in your browser.

Inputs used

Longitudeaccepts -180–180 deg
-0.1276 deg
Latitudeaccepts -84–84 deg
51.5072 deg

Results

UTM Zone
30
Zone And Latitude Band
30U
Central Meridian Of The Zone
-3.0 deg
Approximate Easting
698,718 m

Step by step

  1. 1Values used
  2. 2Zone number
  3. 3Central meridian
  4. 4UTM Zone= 30
  5. 5Zone And Latitude Band= 30U
  6. 6Central Meridian Of The Zone= -3.0 deg
  7. 7Approximate Easting= 698,718 m

Assumptions and limits

  • The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why the 500,000 m false easting?

So that eastings stay positive across the whole zone. A zone is about 668 km wide at the equator, so the offset covers the western half.

Why does UTM stop at 84 degrees?

Because Mercator distortion becomes unacceptable near the poles. UPS, a polar stereographic projection, is used beyond.

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