Antilog and Logarithm Calculator
Compute logarithms and antilogarithms in base 10, base e and base 2.
Runs in your browser. Nothing is uploaded — your input is processed on this device and discarded when you close the tab.
Antilog and Logarithm Calculator
How to use this tool
- Choose Logarithm or Antilog and pick a base (10, e or 2).
- Enter x — the number to take the log of, or the exponent for an antilog.
- Press Calculate to see the result.
Worked example
log base 10 of 100 is exactly 2, and the antilog base 10 of 2 is 100 — the two operations undo each other, as they should.
What this tool does not do / Limits
Logarithms are defined only for positive values; zero or negative inputs are rejected, not answered with a complex number. Results are rounded to six decimal places.
Frequently asked questions
What is an antilog, exactly?
The inverse of a log: the antilog base 10 of 2 is 10 raised to the power 2, which is 100.
What is the natural log?
The log base e (about 2.71828), written ln(x) — the base used throughout calculus and growth maths.
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