Calculate -log(x), commonly used in chemistry (pH, pKa).
Input Value
Result
-log(x)7.0000Negative logarithm of the input.
About this calculator
What is Negative Logarithm?
The negative logarithm is the value of -log_b(x). This function is most famous in chemistry, where pH is defined as -log10[H+]. It transforms very small numbers (like 10^-7) into manageable positive numbers (like 7).
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Pro Tips
Used for pH (acidity), pKa (acid dissociation), pKb (base dissociation).
Also used in information theory (entropy).
As concentration increases, pH decreases.
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Fun Facts
"The 'p' in pH stands for 'power' or 'potential'."
