Work
The readable length
Platforms cap tag length, and readers skim captions rather than reading them. A joined two-word tag is the best compromise: long enough to be specific, short enough to still read as a word.
The Formula
a tag is safe under 30 characters and readable under 24
Platforms cap tag length, and readers skim captions rather than reading them. A joined two-word tag is the best compromise: long enough to be specific, short enough to still read as a word.
| Symbol | Meaning | Unit | Notes |
|---|---|---|---|
| L | Tag length | characters | Characters in the tag including the hash. |
| L_warn | Readable limit | characters | Past this a tag becomes hard to scan in a caption. |
| L_max | Platform limit | characters | Past this a platform may reject the tag outright. |
What Each Symbol Means
Lcharacters
Tag length
Characters in the tag including the hash.
L_warncharacters
Readable limit
Past this a tag becomes hard to scan in a caption.
L_maxcharacters
Platform limit
Past this a platform may reject the tag outright.
See It Worked With Real Numbers
A formula on its own does not tell you which number goes where. The how to choose hashtags page applies this equation to a concrete case, shows every intermediate step, and names the mistakes that produce a wrong answer even when the algebra is right.
Where This Formula Appears
This equation is the working core of How To Choose Hashtags, filed under Everyday Life. Every number the guide produces comes from substituting into this one line.