| Data type | Suffix | Value range | Size |
| Byte | none | 0 to 255
Initial value: 0 | 1 byte |
| Boolean | none | 0 (False) or -1 (True)
initial value: 0 | 2 bytes |
| Integer | % | -32,768 to 32,767
Initial value: 0 | 2 bytes |
| Long | & | -2,147,483,648 to 2,147,483,647
Initial value: 0 | 4 bytes |
| Single | ! | -3.402823E+38 to 3.402823E+38
Initial value: 0 | 4 bytes |
| Double | # | -1.7976931348623158+308 to 1.7976931348623158+308
Initial value: 0 | 8 bytes |
| Currency | @ | -922,337,203,685,477.5807 to 922,337,203,685,477.5807
Initial value: 0 | 8 bytes |
| String | $ | (String length ranges from 0 to 32K characters)
Initial value: "" (empty string) | (2 bytes/character) |
| Data type or structure | Description | Size |
| Array | An aggregate set of elements having the same data type. An array can comprise up to 8 dimensions whose subscript bounds can range from -32768 to 32767.
Initial value: Each element in a fixed array has an initial value appropriate to its data type. | Up to 64K bytes |
| List | A one-dimensional aggregate set whose elements have the same data type and are referred to by name rather than by subscript. | Up to 64K bytes |
| Variant | A special data type that can contain any scalar value, array, list, or object reference.
Initial value: EMPTY | 16 bytes |
| User-defined data type | An aggregate set of elements of possibly disparate data types. Comparable to a record in Pascal or a struct in C.
Initial value: Member variables have initial values appropriate to their data types. | Up to 64K bytes |
| Class | An aggregate set of elements of possibly disparate data types together with procedures that operate on them.
Initial value: When you create an instance of a class, LotusScript initializes its member variables to values appropriate to their data types, and generates an object reference to it. |  |
| Object reference | A pointer to an OLE Automation object or an instance of a product class or user-defined class.
Initial value: NOTHING. | 4 bytes |