rem-Based Spacing Scale Generator
Apply caller selected spacing multipliers to a rem base; no implicit root pixel size.
Description
Generate rem spacing values from a base and supplied multipliers.
A rem spacing scale expresses several design tokens as multiples of one base spacing. It can be calculated without knowing the page's current pixel font size.
When to use this tool
Generate rem spacing values from a base and supplied multipliers. Use it when the input measurements and conventions below match the operation you need.
- Prepare baseRem, multipliers, respecting the measurement basis and boundaries below.
- Compare the worked example with your intended operation before reusing its result.
How to use the tool and how it works
- Enter every field in the input table using the stated units and exact supported selector spelling where applicable.
- Run the tool. Correct input errors before interpreting an output.
- Read the result fields below; use accompanying flags and the stated sign, boundary or model convention when interpreting a number.
baseRem must be positive. The tool multiplies it by each supplied nonnegative multiplier, preserving list order, and returns the rem values; between 1 and 128 multipliers are accepted.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| baseRem | Base rem. | Finite number; greater than zero |
| multipliers | Multipliers. | List of finite numbers |
| Output field | Interpretation |
|---|---|
| result | Object containing the following named result fields. |
| result.spacingRem | Spacing rem list, in the ordering described in the calculation. |
{
"input": {
"baseRem": 0.25,
"multipliers": [
0,
1,
2,
4
]
},
"output": {
"result": {
"spacingRem": [
0,
0.25,
0.5,
1
]
}
}
}Limitations and assumptions
- No CSS is applied and no pixel conversion, sorting or deduplication is performed. The rendered size depends on the consuming page's root font size.
- Every declared field is required and unexpected fields are rejected. Numeric inputs must be finite; input errors are distinct from a valid false result or an explicitly qualified output.
- Extremely large inputs and nonfinite or excessively large outputs are rejected. List positions reported by the tool use zero-based indices unless stated otherwise.
Alternative or Complementary methods
Compare the metric calculation with the intended font and rendered text. Font shaping and layout inspection are more appropriate when the task depends on actual glyph positions or reading conditions. Compare the scope of the nearby tools below before substituting one.
References
Similar or alternative tools
- golden ratio type scale
Font size after an integer number of golden-ratio scale steps.
- letter spacing points from tracking
Letter spacing in points from tracking in thousandths of an em and font size in points.