Natural Log of 0.1

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Log base
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What is ln 0.1?

Answer

ln 0.1 ≈
−2.3026

ln is the natural log, base e ≈ 2.71828.

≈ — the logarithm is irrational; the value is rounded to 4 decimal places.

ln 0.1 is the power you raise e ≈ 2.71828 to, to get 0.1: ey = 0.1.

e⁻³ ≈ 0.0498 < 0.1 < e⁻² ≈ 0.1353, so −3 < ln 0.1 < −2

Oxy1

Answer point ≈ (0.1, −2.3026).

The curve y = ln x passes through (1, 0) and (e, 1) and rises: for x > 1 the log is positive, for 0 < x < 1 negative.

Log of 0.1 in different bases
BaseNotationValue
eln 0.1≈ −2.3026
10log 0.1−1
2log₂ 0.1≈ −3.3219

See Also

FAQ

What is ln 0.1?

ln 0.1 ≈ −2.3026

What is the difference between ln 0.1 and log 0.1?

ln 0.1 is the logarithm to base e, log 0.1 is to base 10: ln 0.1 ≈ −2.3026, log 0.1 = −1. One is the other divided by ln 10: log 0.1 = ln 0.1 / ln 10 = −1.

What does log without a base mean?

At school and on a calculator, log x without a base is the common log, base 10: log 100 = 2. In Python, math.log(x) is the natural log ln x; in Excel, LN is the natural log and LOG is base 10.