Piani

Calcolatrice di logaritmi

Calcola il log in base 10, ln, il log in base 2 o un logaritmo in qualsiasi base, in modo esatto quando possibile (log₄ 8 = 3/2), con i passaggi.

Deve essere maggiore di 0

Risultato

Inserisci i valori e premi Calcola per vedere il risultato.

Formula

log⁡bx=y  ⟺  by=x\log_b x = y \iff b^{y} = x

A logarithm is the power you raise the base to.

log⁡bx=ln⁡xln⁡b\log_b x = \frac{\ln x}{\ln b}

The change-of-base formula works out any logarithm from natural logs.

Come usare questa calcolatrice

  1. Enter x (greater than 0) and pick the base — or choose “Other base” and type it.
  2. Press Calculate. Exact answers are shown when the logarithm is a whole number or fraction.

Esempio svolto

log base 2 of 8

log₂ 8 asks: 2 to what power gives 8?

2³ = 8, so log₂ 8 = 3.

Domande frequenti

Why can’t I take the log of 0 or a negative number?

A positive base to any power is always positive, so no power gives 0 or a negative number.

What is ln?

ln is the natural logarithm: log base e, where e ≈ 2.718281828.