Coordinate Converter — DD, DMS and DDM, Free and In-Browser

Three notations, and who uses which

The same position gets written three ways, and which one you meet depends on the industry rather than the country.

• Decimal degrees (DD) — 28.613889, 77.209. What software wants. Every mapping API, database and GIS file format uses it internally.
• Degrees, minutes, seconds (DMS) — 28°36'50.0"N, 77°12'32.4"E. What paper maps, land records and legal descriptions use.
• Degrees, decimal minutes (DDM) — N28°36.833', E077°12.540'. What aviation and marine navigation use, and what is printed on aeronautical charts. Longitude is written to three digits (E077, not E77) so values line up when read in a column.

Why mixing them up is expensive

The notations are close enough to look interchangeable and far enough apart to matter. Reading DDM's 36.833 as if it were 36 minutes and 83.3 seconds puts you about 800 m from where you meant to be. Dropping a hemisphere letter puts you in the wrong half of the planet. Both mistakes produce output that looks entirely plausible.

Auto-detection, so you do not have to choose

Paste whatever you have — a single pair, a hundred lines, or a mix of all three notations in one block. Each line is identified on its own and converted to all three, shown side by side. There is no input-format dropdown to get wrong.

What else this handles

Hemisphere letters before or after the number, degree symbols present or absent, tabs or commas or semicolons as separators, comma decimal separators, UTF-8 byte-order marks from Windows exports, and blank lines. Rows that genuinely cannot be read are listed with the reason rather than quietly dropped.

For the DMS conversion in detail, see DMS to decimal degrees. To turn a converted list into a Google Earth file, use coordinates to KML.