Logarithm Calculator

Free logarithm calculator to calculate logarithm. Instant results in your browser — no signup.

JavaScript is required for live calculation.

You can still read how Logarithm Calculator works, the formula, examples, and FAQs below.

Direct calculator

Inputs

Base b

b > 0, b ≠ 1

Argument x

Results update when you click Calculate.

log₍10.0000₎(1,000.0000)

3.000000

10.0000^3.000000 ≈ 1,000.0000

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Tools you open will show up here on this device — with your last inputs when available.

Free logarithm calculator to calculate logarithm. Instant results in your browser — no signup. log_b(x) = ln(x) / ln(b).

log_b(x) = ln(x) / ln(b).

log₁₀(1000) = 3.

Base 10?+

Set base to 10 for common logarithms.