In common use, logarithmic scales are in base 10 (unless otherwise specified).

A logarithmic scale is nonlinear, and as such numbers with equal distance between them such as 1, 2, 3, 4, 5 are not equally spaced. Equally spaced values on a logarithmic scale have exponents that increment uniformly. Examples of equally spaced values are 10, 100, 1000, 10000, and 100000 (i.e., 10¹, 10², 10³, 10⁴, 10⁵) and 2, 4, 8, 16, and 32 (i.e., 2¹,