Antilog Calculator
Find the antilogarithm (inverse log) of a number in base 10, base e or any base.
About the Antilog Calculator
Choose the base (10, e, 2 or any other) and enter the logarithm value. The calculator gives the antilog, the number whose logarithm you entered, with the working.
The antilog undoes a logarithm: if log₁₀(y) = x then y = 10ˣ. Antilogs turn pH into hydrogen-ion concentration, decibels into intensity ratios and Richter magnitudes into energy ratios.
The formula
antilog_b(x) = bˣ; antilog₁₀(2.5) = 10^2.5 ≈ 316.23
Worked example
Antilog of 2.5 in base 10
- 10^2.5 = 10² × 10^0.5 = 100 × 3.1623
- = 316.2278
- Negative logs give small numbers: antilog of −3 = 0.001
Questions people ask
What is the antilog of 3?
1,000 in base 10.
Is antilog the same as exp?
In base e, yes: antilog_e(x) = eˣ.
How do I find hydrogen-ion concentration from pH?
[H⁺] = 10^(−pH) mol/L: pH 3 gives 0.001 mol/L.