Egypt coordinate converter
Free Egypt coordinate converter: the Red, Blue, and Purple belts on Egypt 1907 plus Egypt 1930 to WGS84 and UTM zones 35/36 — using the official EPSG::1148 datum shift.
Converter
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Collect named points from conversions or a pasted table, see them on the map, convert them all to one system, and download in any format. The list is stored locally in your browser only.
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Coordinate systems in Egypt: quick reference
Egypt historically works on the Egypt 1907 datum (EPSG:4229) with a Transverse Mercator split into belts: the Red Belt (EPSG:22992) for the centre and Nile Valley on central meridian 31°E, the Blue Belt (EPSG:22991) for the east and Sinai at 35°E, the Purple Belt (EPSG:22993) for the west at 27°E, and the Extended Purple Belt (EPSG:22994) for the far south-west. Alongside them sits the Egypt 1930 datum (EPSG:4199) used on other map series.
The costliest site error is mixing datums: a GPS point observed on WGS84 and plotted on a legacy belt sheet without the shift lands about 130 m off in Egypt. The tool applies the published shift (EPSG::1148) automatically both ways and warns when the point falls outside the system’s area of use.
The converter below opens on a Cairo sample point and lists the Egyptian systems first. Egypt also has a deeper reference section on the main converter page, covering UTM zones 35/36 and the belts in detail.
| EPSG | System | Accuracy |
|---|---|---|
| 4229 | Egypt 1907(geographic) | ±1.8 m |
| 22992 | Egypt 1907 / Red Belt(projected grid) | ±1.7 m |
| 22991 | Egypt 1907 / Blue Belt(projected grid) | ±4 m |
| 22993 | Egypt 1907 / Purple Belt(projected grid) | ±4 m |
| 22994 | Egypt 1907 / Extended Purple Belt(projected grid) | ±5 m |
| 4199 | Egypt 1930(geographic) | ±0.1 m |
The tool covers 10 systems relevant to Egypt (national systems plus the WGS84 UTM zones) — the table above lists only the key ones.
FAQ
- What is the Egyptian Red Belt?
- A Transverse Mercator projection on the Egypt 1907 datum with central meridian 31°E (EPSG:22992), covering central Egypt and the Nile Valley — the most common grid on Egyptian survey sheets.
- When do I use the Blue or Purple Belt?
- Blue (EPSG:22991, 35°E) for eastern Egypt and Sinai; Purple (EPSG:22993, 27°E) for the west; Extended Purple (EPSG:22994) for the far south-west. Follow the project’s reference sheets.
- Why does GPS disagree with an old sheet by about 130 m?
- GPS observes on WGS84 while legacy sheets sit on Egypt 1907 — the datums differ by roughly 130 m in Egypt. A proper datum shift (EPSG::1148) is required, not just re-projection.
- Which UTM zone is Cairo in?
- Cairo (31.2°E) sits in UTM zone 36N (EPSG:32636), while western Egypt falls in zone 35 (EPSG:32635).
- How accurate is the belt-to-WGS84 conversion?
- The published shift is good to a few metres (the tool shows a per-belt accuracy badge). Stake-out and centimetre-grade control networks need local geodetic observation — a service we provide.
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