---
title: "GPS ⇄ Lambert ⇄ UTM converter: Morocco, Algeria, Tunisia, France · almawqii"
description: "Free GPS (WGS 84) ⇄ Lambert ⇄ UTM converter: Morocco Lambert (Merchich), Algeria, Tunisia, Lambert-93 and CC zones, UTM 28 to 32. Batch, no sign-up."
url: https://almawqii.xyz/en/convertisseur
language: en
alternates:
  fr: https://almawqii.xyz/fr/convertisseur.md
  ar: https://almawqii.xyz/ar/convertisseur.md
---

# GPS, Lambert and UTM coordinate converter

Type a WGS 84 latitude and longitude: the X/Y appear in the chosen system — and the other way round. 32 coordinate systems for Morocco, Algeria, Tunisia and France, with the parameters and datum transformations of the EPSG registry.

- EPSG:26191
- EPSG:26192
- EPSG:26194
- EPSG:26195
- EPSG:30791
- EPSG:30792
- EPSG:22391
- EPSG:22392
- EPSG:2154
- UTM 28–32 N
- Computed in your browser: no coordinate is sent or stored, and no account is needed.
- Definitions checked against the EPSG registry with PROJ: less than a millimetre apart on all 32 systems.

## One guide per country

- [Morocco Lambert](https://almawqii.xyz/en/lambert-maroc) — 4 Lambert zones on Merchich · EPSG:26191–26195 · UTM 28–30
- [Algeria Lambert](https://almawqii.xyz/en/lambert-algerie) — Lambert North and South on Nord Sahara 1959 · EPSG:30791, 30792 · UTM 29–32
- [Tunisia Lambert](https://almawqii.xyz/en/lambert-tunisie) — Lambert North and South on Carthage · EPSG:22391, 22392 · UTM 32 N
- [Lambert-93](https://almawqii.xyz/en/lambert-93) — Lambert-93 · CC42 to CC50 · Lambert I to IV and II extended (NTF) · UTM 30–32

## Projection and datum: the two steps of a conversion

A GPS position is a latitude and a longitude on the WGS 84 ellipsoid. National plans are in X/Y: each country projects its own ellipsoid — Clarke 1880 for Merchich, Nord Sahara 1959 and Carthage, GRS 80 for RGF93 — onto a cone (the Lambert projection) or a cylinder (UTM). Converting therefore means shifting the datum and then projecting, or the reverse. Forgetting the datum shift moves points by 70 m in Algeria to more than 300 m in Morocco; picking the wrong zone sends them tens of kilometres away.

## Projection parameters

The EPSG registry values — the ones the converter, Carte and MawCAD use.

| System · Projection | EPSG | Latitude of origin | Central meridian | Standard parallels | Scale factor k₀ | False origin X₀ / Y₀ | Suggested latitudes |
| --- | --- | --- | --- | --- | --- | --- | --- |
| N Morocco Lambert North (zone 1) — Merchich / Nord Maroc — Lambert conformal conic, 1 parallel | EPSG:26191 | 33.3° (37 gr) | −5.4° (−6 gr) | — | 0.999625769 | 500,000 / 300,000 | north of 31°30′ N |
| S Morocco Lambert South (zone 2) — Merchich / Sud Maroc — Lambert conformal conic, 1 parallel | EPSG:26192 | 29.7° (33 gr) | −5.4° (−6 gr) | — | 0.999615596 | 500,000 / 300,000 | 27°54′ – 31°30′ N |
| SN Morocco Lambert Sahara North (zone 3) — Merchich / Sahara Nord — Lambert conformal conic, 1 parallel | EPSG:26194 | 26.1° (29 gr) | −5.4° (−6 gr) | — | 0.999616304 | 1,200,000 / 400,000 | 24°18′ – 27°54′ N |
| SS Morocco Lambert Sahara South (zone 4) — Merchich / Sahara Sud — Lambert conformal conic, 1 parallel | EPSG:26195 | 22.5° (25 gr) | −5.4° (−6 gr) | — | 0.999616437 | 1,500,000 / 400,000 | south of 24°18′ N |
| AN Algeria Lambert North — Nord Sahara 1959 / Nord Algerie — Lambert conformal conic, 1 parallel | EPSG:30791 | 36° (40 gr) | 2.7° (3 gr) | — | 0.999625544 | 500,135 / 300,090 | north of 34°39′ N |
| AS Algeria Lambert South — Nord Sahara 1959 / Sud Algerie — Lambert conformal conic, 1 parallel | EPSG:30792 | 33.3° (37 gr) | 2.7° (3 gr) | — | 0.999625769 | 500,135 / 300,090 | 31°57′ – 34°39′ N |
| TN Tunisia Lambert North — Carthage / Nord Tunisie — Lambert conformal conic, 1 parallel | EPSG:22391 | 36° (40 gr) | 9.9° (11 gr) | — | 0.999625544 | 500,000 / 300,000 | north of 34°39′ N |
| TS Tunisia Lambert South — Carthage / Sud Tunisie — Lambert conformal conic, 1 parallel | EPSG:22392 | 33.3° (37 gr) | 9.9° (11 gr) | — | 0.999625769 | 500,000 / 300,000 | south of 34°39′ N |
| L93 Lambert-93 — RGF93 v1 / Lambert-93 — Lambert conformal conic, 2 parallels | EPSG:2154 | 46.5° | 3° | 44° · 49° | — | 700,000 / 6,600,000 | — |

## Datum and the shift to WGS 84

| Datum | Ellipsoid | a / 1/f | Transformation to WGS 84 | Stated accuracy |
| --- | --- | --- | --- | --- |
| Merchich | Clarke 1880 (IGN) | 6,378,249.200 m / 293.466021294 | Merchich to WGS 84 (1) (EPSG:1166) — ΔX ΔY ΔZ = 31 · 146 · 47 m | ± 7 m |
| Nord Sahara 1959 | Clarke 1880 (RGS) | 6,378,249.145 m / 293.465 | Nord Sahara 1959 to WGS 84 (11) (EPSG:10296) — ΔX ΔY ΔZ = −267.407 · −47.068 · 446.357 m — Rx Ry Rz = −0.179423 · 5.577661 · −1.27762″ · ds = 1.204866 ppm | ± 1 m |
| Carthage | Clarke 1880 (IGN) | 6,378,249.200 m / 293.466021294 | Carthage to WGS 84 (1) (EPSG:1130) — ΔX ΔY ΔZ = −263 · 6 · 431 m | ± 14 m |
| RGF93 v1 | GRS 1980 | 6,378,137.000 m / 298.257222101 | RGF93 v1 to WGS 84 (1) (EPSG:1671) | ± 1 m |
| WGS 84 | WGS 84 | 6,378,137.000 m / 298.257223563 | none | — |

## UTM zones

UTM cuts the globe into 6° zones of longitude, all on WGS 84: scale factor 0.9996 on the central meridian, X₀ = 500,000 m, Y₀ = 0 north of the equator. Zones 28 to 32 N cover Morocco, Algeria, Tunisia and France; a point's zone follows from its longitude.

| Zone | EPSG | Central meridian | Longitudes | Countries |
| --- | --- | --- | --- | --- |
| 28N WGS 84 / UTM zone 28N | EPSG:32628 | −15° | −18° → −12° | Morocco |
| 29N WGS 84 / UTM zone 29N | EPSG:32629 | −9° | −12° → −6° | Morocco · Algeria |
| 30N WGS 84 / UTM zone 30N | EPSG:32630 | −3° | −6° → 0° | Morocco · Algeria · France |
| 31N WGS 84 / UTM zone 31N | EPSG:32631 | 3° | 0° → 6° | Algeria · France |
| 32N WGS 84 / UTM zone 32N | EPSG:32632 | 9° | 6° → 12° | Algeria · Tunisia · France |

## Frequently asked questions

### What is a Lambert projection?

A conformal conic projection: it unrolls the ellipsoid onto a tangent or secant cone, which preserves angles and gives plane X/Y coordinates in metres. Each country tunes it to its latitude: four zones in Morocco, two in Algeria and in Tunisia, Lambert-93 and nine CC zones in France.

### What is the difference between WGS 84, Lambert and UTM?

WGS 84 gives a position in degrees (latitude, longitude): the one from your GPS, your phone or Google Maps. Lambert and UTM give X/Y in metres on a plan: Lambert in a country's national system, UTM in a worldwide 6° zone of longitude. The converter goes from one to the other.

### How do I enter degrees, minutes and seconds?

Type them as they are: 33°34'23"N, 33 34 23 N or 33.5731 — with W, S or a minus sign for west and south. A decimal comma works too (33,5731). The result is also shown in degrees, minutes and seconds.

### Are my coordinates sent anywhere?

No. The computation runs in your browser with the proj4js library and the EPSG definitions: no coordinate is sent to the server or stored. The converter works without an account.

### Can I use the results in AutoCAD, Covadis or QGIS?

Yes. Copy X and Y — tab separated, they paste into two columns — or download the CSV of a batch conversion. To draw, Carte exports DXF, Shapefile with .prj, KML and GeoJSON, and MawCAD takes the survey into CAD with a free account.

### Can I convert a list of points at once?

Yes: open “Batch conversion”, paste your points — one per line, with a name, the two coordinates and Z if you have it — then download the result as CSV or copy it into a spreadsheet. Nothing is sent: everything is computed in the browser.

## The other converters

- [Morocco Lambert](https://almawqii.xyz/en/lambert-maroc) — 4 Lambert zones on Merchich · EPSG:26191–26195 · UTM 28–30
- [Algeria Lambert](https://almawqii.xyz/en/lambert-algerie) — Lambert North and South on Nord Sahara 1959 · EPSG:30791, 30792 · UTM 29–32
- [Tunisia Lambert](https://almawqii.xyz/en/lambert-tunisie) — Lambert North and South on Carthage · EPSG:22391, 22392 · UTM 32 N
- [Lambert-93](https://almawqii.xyz/en/lambert-93) — Lambert-93 · CC42 to CC50 · Lambert I to IV and II extended (NTF) · UTM 30–32