| RADIANS | The number of radians given the number of degrees. |
| RAND | The random number between 0 and 1. |
| RANDBETWEEN* | The random number between two specified numbers, inclusively. |
| RANK | The rank of a value in a range (in descending order). |
| RATE | The interest rate per period of an annuity. |
| RECEIVED* | The number received at maturity for a fully invested security. |
| REGISTER.ID | The registered id for a specified dynamic link library (DLL). |
| REPLACE | The text string with a number of characters replaced. |
| REPT | The text string with a smaller text string repeated a number of times. |
| RIGHT | The last or right most character (or characters) in a text string. |
| ROMAN | The text string converting a Binary number to a Roman numeral. |
| ROUND | The number rounded to a specified number of digits. |
| ROUNDDOWN | The number rounded down to the nearest integer. |
| ROUNDUP | The number rounded up to the nearest integer. |
| ROW | The row number of the cell reference. |
| ROWS | The number of rows in a cell range or reference. |
| RSQ | The square of Pearson product moment correlation coefficient through data points in known Ys and known Xs. |
| RTD | The real time data from a program that supports COM. |
