Uniform Identifier Entropy
A uniformly sampled fixed-length identifier has a theoretical search space set by alphabet size and length.
Uniform Identifier Entropy
Encoding · 2 inputs
How to use this calculator
- Enter alphabet size in characters.
- Enter length in characters.
- Select Calculate and keep the output unit with the answer.
Before you use the answer
Write down whether a size uses decimal or binary prefixes and whether a rate counts bits or bytes. Compare the same system boundary on both sides of a performance calculation. Measured throughput is usually a more useful planning input than the maximum number on a product label.
This assumes independent uniform selection. It does not measure the strength of human-chosen passwords.
Does it save my inputs?
No calculation history is stored by this website. The calculator works locally in your browser. See the privacy policy for hosting and contact details.
Why might a result be approximate?
Measurement uncertainty, ideal-model assumptions and floating-point rounding can all matter. Displaying more digits does not improve the original measurement.
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