Logarithm Calculator
log of any value at any base, plus ln, log10, and log2.
log10(1000)
3.000000
ln (base e)
6.907755
log₁₀
3.000000
log₂
9.965784
x must be positive and base must be positive and not equal to 1. Computed as ln(x) / ln(base).
About
Enter x and a base, get log_base(x). Also shows the natural log, base-10 log, and base-2 log for the same value. Computed using the change-of-base formula.
How to use
- Enter x.
- Enter the base.
- Read the log and the alternate-base values.
FAQ
Why does it return an error sometimes?+
log is only defined for x > 0. The base must be positive and not equal to 1.