Grout Calculator
Estimate mixed grout volume and weight from joint geometry.
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What this tool does
Estimate mixed grout volume and weight from joint geometry. Density is user-entered. Dry bag yield depends on product formulation; confirm manufacturer coverage.
How to use the Grout Calculator
- Enter or select tiled area in sqft.
- Enter or select tile length in in.
- Enter or select tile width in in.
- Enter or select joint width in in.
- Enter or select filled joint depth in in.
- Enter or select mixed grout density (lb/cu ft).
- Enter or select waste allowance (%).
- Read the calculated result; change any measurement to compare alternatives.
Formula
joint fraction = 1 − tileLength×tileWidth/((tileLength+joint)×(tileWidth+joint)); grout lb=area×depth/12×fraction×density×(1+waste/100)
- area
- Tiled area (sqft, before metric conversion)
- tileLength
- Tile length (in, before metric conversion)
- tileWidth
- Tile width (in, before metric conversion)
- joint
- Joint width (in, before metric conversion)
- depth
- Filled joint depth (in, before metric conversion)
- density
- Mixed grout density (lb/cu ft)
- waste
- Waste allowance (%)
Density is user-entered. Dry bag yield depends on product formulation; confirm manufacturer coverage.
Worked example
For grout calculator, the following measurements illustrate the exact method: Tiled area: 200; Tile length: 12; Tile width: 12; Joint width: 0.125; Filled joint depth: 0.25; Mixed grout density (lb/cu ft): 100; Waste allowance (%): 10.
Inputs
- Tiled area200 sq ft
- Tile length12 in
- Tile width12 in
- Joint width0.125 in
- Filled joint depth0.25 in
- Mixed grout density (lb/cu ft)100
- Waste allowance (%)10
Result
- Mixed grout weight9.4 lb
- Mixed joint volume0.09 cu ft
Results explained
- Mixed grout weight
- Mixed grout weight from the formula above, expressed in lb before metric conversion. Density is user-entered. Dry bag yield depends on product formulation; confirm manufacturer coverage.
- Mixed joint volume
- Mixed joint volume from the formula above, expressed in cuft before metric conversion. Density is user-entered. Dry bag yield depends on product formulation; confirm manufacturer coverage.
Frequently asked questions
Calculate the joint fraction of a repeating tile module and multiply by area, filled depth and density.
Use tile dimensions, joint width/depth and the mixed-product density.
Use 5–10% for simple layouts and 10–15% for diagonal cuts or complicated outlines; the allowance is editable.
Split the outline into rectangles or triangles and calculate each section separately. Do not count overlapping sections twice.
This is a purchasing estimate, not a structural design. Confirm measurements and local requirements before buying or building.