Math / Browser calculator

Log Calculator

Log Calculator works from the inputs you provide and returns logarithm. Use the calculation panel to explore a scenario, then check the formula and limitations before applying the result.

Your inputs

Minimum: 1e-06
Minimum: 1e-06

Your results

Enter your values and calculate to see the result.

Formula and calculation method

log_base(x) = ln(x)/ln(base).

Use consistent units for all comparable inputs. The displayed result is rounded; arithmetic is performed with the full available numeric precision. Check your source measurements before relying on the result.

How to use log calculator

  1. Set Value. The example below uses 100.
  2. Set Logarithm base. The example below uses 10.
  3. Select Calculate to update the result. Reset restores the illustrated inputs. Copy, print or download your own result if you need a record.

Worked example

Example inputs
Value
100
Logarithm base
10
Logarithm
2

Factors affecting your result

Use consistent units for all comparable inputs. The displayed result is rounded; arithmetic is performed with the full available numeric precision. Check your source measurements before relying on the result.

Changing value changes the scenario being evaluated. Adjust one input at a time when comparing results, keep a copy of the assumptions, and compare values using the same unit and period. A precise arithmetic result does not make an uncertain assumption precise.

Frequently asked questions

How does the log calculator work?

log_base(x) = ln(x)/ln(base).

What inputs does Log Calculator need?

Enter value, logarithm base. Choose values that correspond to the same situation and measurement convention.

How should I interpret the log calculator result?

Use consistent units for all comparable inputs. The displayed result is rounded; arithmetic is performed with the full available numeric precision. Check your source measurements before relying on the result.

Are my log calculator inputs uploaded?

No. The calculation runs in this browser. Favorites, recent tool names, theme and formatting preferences may be saved locally, but calculation inputs are not sent to a calculation server or stored by this website. Shared links do not include entered values.

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