Here is a general conversion table showing how think3 entities are mapped to the IGES ones when converting a think3 2D drawing to IGES the format.
| think3 entity | IGES Entity to which it is converted | IGES entity number |
| Point | Point | 116 |
| Line | Line | 110 |
| Circular Arc | Circular Arc | 100 |
| Ellipse | Conic Arc | 104 |
| NURBS curve | Rational B-Spline Curve | 126 |
| Dimensions | — | — |
| Linear | Linear Dimension | 216 |
| Angular | Angular Dimension | 202 |
| Ordinate | Ordinate Dimension | 218 |
| Diameter | Linear Dimension | 216 |
| Radius | Radius Dimension | 222 |
| Label | General Label | 210 |
| Text | General Note | 212 |
| X-hatchings | Sectioned Area | 230 |
| Group | Group without back pointers | 402 IFORM 7 |
| View | Group without back pointers | 402 IFORM 7 |
| Line Type | Line Font Pattern | — |
| Layers | Levels | 406 Form1 |
| Line Width | Line Weight | — |
| Color | Color | — |