# Logarithm Calculator

> Logarithm calculator: evaluate log base 10, natural log, or any custom base, with step-by-step conversion to exponential form. Free, runs in your browser.

- **Canonical URL:** https://boringtoolskit.com/logarithm-calculator/
- **Category:** Generators
- **Evidence level:** authored-methodology
- **Reviewed:** 2026-09-20
- **Last verified:** 2026-10-12
- **Privacy:** Inputs and results stay in this browser unless the page clearly labels an external request.

## How it works

log base b of x = ln(x) / ln(b) (change of base), with b set to 10, 2, e or a custom value. Each result is checked by the inverse b^answer.

## Assumptions

- Input format is assumed clean; malformed input is reported rather than guessed at.
- Output is computed client-side and stays in your browser.

## Common questions

### Is anything sent to a server?

No. The transform runs in your browser; nothing you paste leaves the page.

### What is the honest limitation?

It is mechanical, not judgmental: the tool guarantees format correctness, not fitness for your context — skim the output before shipping it.

## Sources

- [Calculation methodology and verification standard](/methodology/)

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