Math & Everyday Calculators

Logarithm Calculator

Use Logarithm Calculator free in your browser. No account required; your input is processed locally in your browser.

Runs locallyYour inputs stay in your browser.
Workspace
Result
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HOW IT IS CALCULATED

Calculate logarithms in any valid base

Find the exponent to which the base must be raised to obtain the selected number.

Instant resultClear formulaRuns locally
01Values
02log_b(x) = ln(x) ÷ ln(b)
03Result

log₁₀(100) = 2

GOOD TO KNOW

A logarithm is the inverse of exponentiation

If b² = x, then log base b of x equals 2.

02

In short

What logic does the calculator use?

log_b(x) = ln(x) ÷ ln(b)

Example?

log₁₀(100) = 2