Solution 12100: Calculating Inverse Logarithms or Antilogs on the TI-89 Family, TI-92 Family, and Voyage™ 200 Graphing Calculators.
How do I calculate inverse logs or antilogs on the TI-89 family, TI-92 family or Voyage 200 graphing calculators?
The inverse log of a number N is equal to 10^N.
10^ can be entered manually or accessed through the CATALOG menu.
To calculate the inverse log of 1.25, enter 10^1.25, which returns 17.7828.
Please see the TI-89 family, TI-92 family and Voyage 200 guidebooks for additional information.