Find the antilogarithm — the inverse of a logarithm — for any base.
How it works
The antilog of x in base b is simply b^x. The base-10 antilog of 2 is 100 (since log₁₀(100) = 2); the base-10 antilog of 0.5 is about 3.162.
What this does not include
This is the general antilog relationship. For a broader “raise any base to any exponent” calculation not specifically framed around reversing a logarithm, see this site’s exponent calculator instead.
How to use this calculator
- Enter the log value (x).
- Enter the base (10 for a common log, or any other base).
A worked example
The antilog (base 10) of 2 is 10² = 100 — reversing what log₁₀(100) = 2 would give.
The antilog (base 10) of 0.5 is 3.162278.
What the variables mean
| Variable | Meaning |
|---|---|
| Log value | The logarithm value being reversed |
| Base | The logarithm’s base |
Edge cases worth knowing
Antilog is simply the inverse of logarithm — raising the base to the given power, the exact reverse of what this site’s log calculator computes.
A base of zero or one has no meaningful logarithmic system — neither can serve as a valid exponential base, so the calculator declines to show a result.
What’s the antilog used for?
Whenever you’ve solved an equation and ended up with a logarithm on one side, taking the antilog “undoes” that log to recover the original number — common in chemistry (pH calculations) and engineering.
What’s the antilog of a natural logarithm (ln)?
Set the base to e (approximately 2.71828) instead of 10, since a natural log’s antilog raises e to that power rather than 10.
Can the log value be negative?
Yes — a negative log value gives an antilog less than 1, since raising a positive base to a negative power produces a fraction.
