Concrete Expansion Joint Filler Length Calculator

Plan expansion joints precisely for slabs, pavements, and industrial floors with confidence. Enter slab size, joint spacing, joint width, and filler thickness to calculate. Get total filler length, roll counts, strip counts, and cost instantly calculated. Switch units, apply waste, and generate shareable result URLs easily. Export CSV and PDF reports for precise documentation.

Unit System: Packaging:
Slab Geometry
Joint Layout
Packaging & Cost
per m
Presets
Presets set typical sizes and spacing. Adjust as needed.

Example Data

Click a row to load values. Modify and recalculate.

Scenario Size Spacing Gap × Thick Units Perimeter Action
Driveway 30 × 12 10 0.5 × 0.5 ft/in Yes
Walkway 20 × 3 3 12 × 12 m/mm No
Warehouse 60 × 30 6 15 × 10 m/mm Yes

Formulas Used

  • nL = max(⌊L / s⌋ − 1, 0) interior lines parallel to length.
  • nW = max(⌊W / s⌋ − 1, 0) interior lines parallel to width.
  • Interior length = nL · W + nW · L
  • Perimeter length = include? 2·(L + W) : 0
  • Total length = (Interior + Perimeter) · (1 + waste%)
  • Volume = Total length · gap width · thickness

Units are converted internally to meters (lengths) and meters for gap width and thickness. Volume is returned in cubic meters, then expressed as liters or cubic inches.

How to Use

  1. Select the unit system.
  2. Enter slab length and width.
  3. Set joint spacing, gap width, and filler thickness.
  4. Choose whether to include perimeter joints around the slab.
  5. Pick packaging type and provide lengths and optional costs.
  6. Click Calculate to generate totals and packaging.
  7. Export your results using Download CSV or Download PDF.
  8. Use Copy Shareable URL to capture inputs for later.

FAQs

We compute interior lines along each direction from the spacing. Lines parallel to the length multiply by slab width, and lines parallel to the width multiply by slab length.

Perimeter joints are common between slabs and fixed edges. Enable when a compressible filler is specified at boundaries or adjacent construction requires separation.

Spacing is a design decision. Many specifications relate spacing to slab thickness, exposure, reinforcement, and shrinkage control. Follow project documents and local standards.

Volume helps compare products sold by volume or mass. It multiplies total joint length by gap width and filler thickness after unit conversions and waste factor.

Counts are rounded up, so partial rolls or strips require full units. Increase roll length, use longer strips, or reduce waste percentage to reduce package totals.
This tool is for planning support only. Confirm results with project requirements and product data sheets.

Inputs Summary

Results Table

Metric Value

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.