Use this mathematical operation when its input domain, operator precedence, logarithm base, and numeric precision match the intended calculation.

Value

Required number input.

Base

Required number input.

Calculate a logarithm using any positive base other than one. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Logarithm

The resulting logarithm returned as a number.

• Expression evaluation must not execute arbitrary code, and floating-point arithmetic can introduce rounding, overflow, underflow, and domain errors. Logarithmic means require valid positive inputs and careful handling near equality.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Validate syntax and domains before evaluation, compare boundary cases with an independent implementation, and use higher precision when error tolerance requires it.

• Logarithmic Mean Calculator

  Calculate the logarithmic mean of two positive numbers.

• Arithmetic Expression Evaluator

  Evaluate an arithmetic expression with + - * / % ^, unary minus and parentheses using standard precedence.

• Gene Coordinate Length

  Calculate gene length from one-based inclusive start and end coordinates: end − start + 1. Inclusive coordinates count both endpoint bases, so a feature whose start and end are equal is one base pair long.