Solution 11579: Calculating Logs of Bases Other Than 10 on the TI-83 Plus Family of Graphing Calculators.
How do I calculate logs of bases other than 10 on the TI-83 Plus family of graphing calculators?
The log( function can be used to calculate bases other than 10 by using a logarithmic identity logab = log(b)/log(a)
Example: Calculate log4160
• Press [LOG], input 160, then press [ ) ].
• Press [÷].
• Press [LOG], input 4, then press [ ) ].
• Press [ENTER] to complete the calculation.
Please see the TI-83 family guidebooks for additional information.