The Collatz calculator calculates the Collatz mapping for any given number. You can type in either box (decimal or binary) and press [enter] to calculate the result of applying the mapping.
Some interesting links:
A solution to the 3x+1 problem by Peter Schorer (14-apr-2017)
Alternative phrasing of the Collatz Conjecture: "The Hamming weight of the Collatz mapping always returns to 1."