I needed to find the closest frequency to the target 38kHz (planned to use CTC on 2*38kHz = 76kHz, where CTC means: Clear Timer on Compare) that can be reached by using the timer (in hardware mode). Also I wanted to learn the basics for AngularJS . Below in this page is the resulted tool:
Usage Note: After you enter the base microcontroller clock source and the desired frequencies press the Compute Posibilities button. Look in the tables below for the resulted timer period, counter threshold and suggested prescalers configuration.
Note: Any feedback would be GREATLY appreciated. If you have suggestions how to improve this tool let me know. If you want to use this work in your site, please post a visible link to this blog page on your site page. Thank you!
UC Prescalers 
Timer
16 bit Timer 



UC Base Frequency: Hz
Desired Frequencies:
 Hz
Least Common Multiple: Hz
Greatest Common Divisor: Hz
Sorting predicate = {{ResultsSort}}
Frequency (Hz)  Timer Interval  Timer Count  UC Prescaler  Timer Prescaler 

{{result.FrequencyInHz}}  {{result.TimerInterval}}  {{result.TimerCount}}  {{'1/'+Math.pow(2, result.UCPrescaler)}}  {{'1/'+Math.pow(2, result.TimerPrescaler)}} 
Frequency (Hz)  Closest Frequency  Error  Timer Interval  Timer Count  UC Prescaler  Timer Prescaler 

{{result.FrequencyInHz}}  {{result.FrequencyInHz + result.Error}}  {{result.Error}}  {{result.TimerInterval}}  {{result.TimerCount}}  {{'1/'+Math.pow(2, result.UCPrescaler)}}  {{'1/'+Math.pow(2, result.TimerPrescaler)}} 