Log Base N Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the value and the base.
- Read the logarithm.
How it works
log base b of x = ln(x) ÷ ln(b) — the change-of-base formula.
Worked example
log base 10 of 1000. = 3.
Common mistakes
- Using base 1 or a non-positive base/value — these are undefined.
- Confusing log base 10 with the natural log (base e).
Frequently asked questions
What bases are common?
Base 10 (common log), base e (natural log, ln) and base 2 (used in computing). This tool handles any valid base.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.