Antilog Calculator
Reverse a logarithm: enter the exponent and the base to get the original number back, with the substitution shown.
How to use it
- Enter the logarithm value you want to reverse.
- Pick the base that logarithm was taken in — usually 10 or e.
- The answer is simply the base raised to that power.
Examples
| antilog₁₀(3) | 1000 |
| antilog₂(10) | 1024 |
Antilog reverses a logarithm — given the exponent and the base, it returns the original number: antilog_b(x) = bˣ. It comes up whenever you have a logarithmic reading and need the underlying quantity back.
Worked example — pH to concentration
A solution has pH 3, and pH is defined as −log₁₀[H⁺]. To get the hydrogen ion concentration back, take the antilog: [H⁺] = antilog₁₀(−3) = 10⁻³ = 0.001 mol/L. The same reversal works for decibels, the Richter scale, or any other log-scaled measurement.
Questions people ask
Is antilog the same as an exponent?
Yes. The antilogarithm of x in base b is exactly bˣ. The name survives from log tables, where you looked the value back up in an antilog table.
Is anything sent to a server?
No. Every calculation runs in your browser, so nothing you type is uploaded and the page keeps working offline once it has loaded.
Last updated 17 August 2026