| T | The text string of the value given. |
| TAN | The tangent of an angle in radians. |
| TANH | The hyperbolic tangent of a number. |
| TBILLEQ* | The bond equivalent yield for a treasury bill. |
| TBILLPRICE* | The price per $100 face value for a treasury bill. |
| TBILLYIELD* | The yield for a treasury bill. |
| TDIST | The percentage points probability for the Students t-distribution. |
| TEXT | The text string of a number in a particular format. |
| TIME | The time as a decimal given the hour, minute and second. |
| TIMEVALUE | The time as a decimal returned as text given a date serial number. |
| TINV | The t-value of the Students distribution as a function of the probability and the degrees of freedom. |
| TODAY | The serial number representing today's date. |
| TRANSPOSE | The array with its orientation changed. |
| TREND | The y-values along a linear trend given a set of x-values. |
| TRIM | The text string with all spaces removed from the beginning and end. |
| TRIMMEAN | The mean of the interior of a data set. |
| TRUE | The logical value TRUE. |
| TRUNC | The number with any decimal places removed. |
| TTEST | The probability associated with a student's t-Test. |
| TYPE | The number indicating the datatype of the value. |
