Baseline Shift Superscript Percent
Apply a caller font-specific superscript baseline-rise percentage to the base point size, retaining signed shifts. Not a universal glyph metric, exponent em conversion or shaping engine.
Description
Superscript baseline movement is separate from superscript glyph size.
Superscript baseline movement is separate from superscript glyph size.1
This calculator applies a supplied signed baseline-rise percentage to the base font size.
When to use Baseline Shift Superscript Percent
Use this tool when you need to reproduce the stated calculation from measured records or independently selected model inputs. Establish the font version, feature, layout, physical or CSS units, and matched reference basis needed for this calculation.
How to use Baseline Shift Superscript Percent and understand its results
- Establish the font version, feature, layout, physical or CSS units, and matched reference basis needed for this calculation.
- Enter observedBaseFontSizePoints, callerSuperscriptBaselineRisePercent, following the field table and rules below, then run the tool.
- Read callerSuperscriptBaselineRisePoints. Use the output meanings below to interpret units, signs, flags, and any nested result fields.
- Correct reported input issues and run again. For a successful result, check the stated evidence coverage and assumptions before using it in your review.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedBaseFontSizePoints | Observed base font size points | number | Required |
| callerSuperscriptBaselineRisePercent | Caller superscript baseline rise percent | number | Required |
Use a positive base size in points and a finite signed rise percentage. Multiply size by percentage divided by 100. Negative values remain negative; the tool does not infer a font metric or lay out text.
baselineRisePoints=basePoints×risePercent/100 Symbols follow the input and output meanings and the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| callerSuperscriptBaselineRisePoints | Caller superscript baseline rise points | number |
{
"input": {
"observedBaseFontSizePoints": 12,
"callerSuperscriptBaselineRisePercent": 30
},
"output": {
"callerSuperscriptBaselineRisePoints": 3.6
}
}Limitations and assumptions
The calculation uses declared units and font or layout assumptions. It does not shape glyphs, lay out actual pages, or certify accessibility or print quality.
Missing required fields, unknown fields, wrong types, and violated calculation rules are input issues. Numeric values must be finite; nonfinite results are rejected.
Alternative or Complementary methods
For a related review, use Superscript/Subscript Default Size Percent: Superscript and subscript sizing can use different font-specific policies. Scaling the base point size makes those two explicit policies visible without assuming a universal default. For a complementary step, use Small Caps Size Percent Lookup: Small-cap height depends on the font and feature being measured. This lookup compares your observed relative height with a verified reference under an exact font-and-feature key.
References
-
Baseline Shift Superscript Percent — tool.io
Similar or alternative tools
- Superscript/Subscript Default Size Percent
Superscript and subscript sizing can use different font-specific policies. Scaling the base point size makes those two explicit policies visible without assuming a universal default.
- Small Caps Size Percent Lookup
Small-cap height depends on the font and feature being measured. This lookup compares your observed relative height with a verified reference under an exact font-and-feature key.