Description
Subtract margins from spineHeight for availableHeight.
Linear storage capacity depends on the dimensions counted, spacing between items, and any reserved expansion. A total length may hide individual-item and structural constraints.
Subtract margins from spineHeight for availableHeight.
When to use this tool
Use Book Spine Label Line Budget when you need a supplied shelf, spine-label, or folder-space estimate.
How to use the tool and how it works
- Enter spineHeight, topMargin, bottomMargin, lineHeight, gap. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read availableHeight, lines. Use the output convention below.
Subtract margins from spineHeight for availableHeight. Fit lines with floor((availableHeight + gap) / (lineHeight + gap)), requiring positive lineHeight and nonnegative gap.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| spineHeight | Spine Height | Required. Finite number. |
| topMargin | Top Margin | Required. Finite number; minimum 0. |
| bottomMargin | Bottom Margin | Required. Finite number; minimum 0. |
| lineHeight | Line Height | Required. Finite number; strictly above 0. |
| gap | Signed difference under the stated subtraction order. | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| availableHeight | Available Height | Required. Finite number. |
| lines | Lines | Required. Safe integer. |
{
"input": {
"spineHeight": 100,
"topMargin": 10,
"bottomMargin": 10,
"lineHeight": 10,
"gap": 2
},
"output": {
"availableHeight": 80,
"lines": 6
}
}Limitations and assumptions
- Gap is counted only between lines; typography, wrapping, printer tolerances, and physical readability are not modeled.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Check physical dimensions, load capacity, and the storage or printing layout before using an aggregate budget.
References
Similar or alternative tools
- Shelf Space Volume Width Factor
Multiply volumes by averageWidth for occupiedLength and by 1 + expansionFraction for plannedLength.
- Archive Folder Expansion Allowance Term
Multiply currentThickness by 1 + expectedIncreaseFraction and add fixedAllowance for plannedThickness.