This calculator finds the antilogarithm of a number, the value whose logarithm it is. Enter the number and the base (10 for common logs); you get the antilog in that base and the natural antilog eˣ.
Formula
antilog_b(x) = bˣ, because log_b(bˣ) = x. The natural antilog is eˣ, with e ≈ 2.71828.
Worked Example
The antilog of 2.5 in base 10.
- 10^2.5 = 10² × 10^0.5 = 100 × 3.16228 = 316.2278
- e^2.5 = 12.1825
How to read the result
On a handheld calculator the antilog key is usually 10ˣ (often shift + log); for natural logs use eˣ (shift + ln). Check: log₁₀ 316.2278 = 2.5.
Limits and common mistakes
- The base must be positive and not 1.
- Very large x overflows; the calculator limits x to ±300.
Frequently Asked Questions
What is the antilog of 2?
100 in base 10.
What is the antilog of −1?
0.1 in base 10.
How do I find antilog on a calculator?
Press shift (or 2nd) and log to get 10ˣ, then type the number.
Is antilog the same as exponent?
Yes: antilog_b(x) = bˣ.
Formula used
in x | Logarithm value x | - | 2.5 | -300 | 300 in b | Base | - | 10 | 0.000001 | 1000000 out y | Antilog (b to the power x) | - | b^x | 4 out ex | Natural antilog (e to the power x) | - | exp(x) | 4
Each line is one input (in, sel, list) or one result (out: label, unit, formula, decimals). How the calculators work
Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.