Logarithm 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 number and (optionally) the base.
- Press Calculate.
How it works
A logarithm answers 'what power gives this number?': log_base(number) = ln(number) ÷ ln(base). Base defaults to 10.
Worked example
log₁₀(1000). = 3.
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.