Nautical angle calculator

This calculator is used to add and subtract angles in the form used in the Nautical Almanac, a publication with data used for navigation by ships. The angles in this publication are expressed in degrees in the usual way (0° to 359°), each degree is divided into 60 minutes, but each minute is divided into ten decimals (and not into 60 seconds).

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The calculator adds or subtracts input values from the running total in the top window.


The decimal part of the minutes output is rounded to 1 decimal place to be consistent with navigation practice. However, the internal result is kept to the highest possible precision so that successive operations do not produce a cumulative error.

Automatic conversion to Degrees - Minutes - Seconds

Whenever the calculator outputs a new result it also displays it in the Degrees - Minutes - Seconds format just below the main display window.

See also Degrees - Minutes - Seconds angle calculator.

Other angle topics


Angle Types

Angle relationships