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Natural Logarithm Calculator FullScreen

Are you looking for a natural logarithm calculator? Our tool provides accurate calculations for the natural logarithm function. With its user-friendly interface, you can quickly obtain the natural logarithm of any number.

ln x = loge x = y


* Use e for scientific notation. E.g: 5e3, 4e-8, 1.45e12


What is Natural Logarithm

The natural logarithm, often denoted as ln, is a specific logarithmic function that is based on the mathematical constant e (Euler's number). The natural logarithm provides a way to determine the exponent to which e must be raised to obtain a given number.

Formally, the natural logarithm of a positive real number x, written as ln(x), is defined as the integral of 1/t with respect to t from 1 to x:

ln(x) = ∫[1, x] 1/t dt

In simpler terms, the natural logarithm of a number x is the exponent that e must be raised to in order to equal x. Mathematically, this can be represented as:

e^(ln(x)) = x

Some key properties of the natural logarithm include:

  1. ln(1) = 0: The natural logarithm of 1 is equal to 0.

  2. ln(e) = 1: The natural logarithm of e is equal to 1.

  3. ln(x * y) = ln(x) + ln(y): The natural logarithm of the product of two numbers x and y is equal to the sum of their individual logarithms.

  4. ln(x^n) = n * ln(x): The natural logarithm of a number x raised to the power of n is equal to n times the logarithm of x.

The natural logarithm is widely used in various fields of mathematics, science, and engineering. Some common applications include:

  1. Solving exponential equations: The natural logarithm can be used to solve equations involving exponential functions, where the unknown variable appears in the exponent.

  2. Calculating growth and decay rates: In exponential growth or decay processes, the natural logarithm is used to determine the rate of change over time.

  3. Probability and statistics: The natural logarithm is frequently used in statistical analysis, such as calculating log-odds, modeling data with a logarithmic transformation, or working with logarithmic scales.

  4. Calculus and differential equations: The natural logarithm frequently appears in mathematical expressions and solutions involving differentiation and integration.

It's worth noting that the natural logarithm is different from the logarithm with base 10 (common logarithm) or other bases. The natural logarithm specifically uses Euler's number e as its base, which occurs naturally in many mathematical and scientific contexts.

Natural Logarithm formula

The formula for the natural logarithm (ln) of a positive real number x can be expressed as:

ln(x) = logₑ(x) = ∫[1, x] 1/t dt

Here, ln(x) represents the natural logarithm of x, and logₑ(x) is another notation sometimes used to indicate the natural logarithm.

Alternatively, the natural logarithm can also be defined using the base-e exponential function, e^x:

ln(x) = logₑ(x) = y, such that e^y = x

This means that the natural logarithm of x is the exponent (y) to which e must be raised in order to obtain the value x.

It's important to note that many scientific calculators and mathematical software have built-in functions or buttons specifically for calculating the natural logarithm. In those cases, you can simply input the desired value and obtain the result without explicitly using the integral representation.

Natural Logarithm Example

Number Natural Logarithm (ln)
1 0
2 0.69315
3 1.09861
4 1.38629
5 1.60944
10 2.30259
100 4.60517
1000 6.90776

In this example, you can input different numbers and obtain their respective natural logarithm values. The natural logarithm is the logarithm base e, where e is Euler's number approximately equal to 2.71828. This table provides a clear visualization of how the natural logarithm function calculates the logarithm of different numbers.

Please note that the values in the table are rounded to five decimal places for simplicity. Depending on your specific calculator or math library, you may get more precise results.