Column Letter Converter
Convert column letters to numbers, expand ranges into cell lists, and translate between A1 and R1C1 reference styles.
Letter ↔ Number
Column AA = 27
Range Expander
3 rows × 3 columns = 9 cells
A1, B1, C1, A2, B2, C2, A3, B3, C3
A1 ↔ R1C1
R1C1
Relative R1C1 parts like R[-1]C[2] are measured from the anchor cell.