Log Calculator

This tool evaluates a logarithm in whatever base you need. Enter a positive number and a base, and it returns the log of that number in your base together with the natural log, the base 10 log and the base 2 log, plus a check that raises the base back to the answer. The antilog mode does the reverse, turning a base and a logarithm value back into the original number. Results are rounded to eight decimals before display, so the log of 1000 in base 10 reads as 3 rather than as a trail of nines.