Free · Cement and concrete calculators 🏦

Tile Joint Grout Volume and Bags

Estimate grout volume, wet mass and dry bags for a repeating rectangular tile grid.

  • Formula & worked example
  • Private in your browser
  • No signup
Go to tool

Calculator inputs

Loading calculator…

How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

In initial display units, Length of the area (L) 2, Width of the area (W) 3, Length of tile (l) 9, Width of tile (w) 9, Gap width (g) 10, Gap depth 10, Grout density 1000, Dry material percentage 50, Weight per bag 2 gives Total area to be tiled 6, Area covered by a single tile 81, Grout volume 11400, Grout weight 11.4, Dry material weight 5.7, Number of bags needed 3.

Joint fraction = 1−tile area/((tile length+gap)×(tile width+gap)); grout volume = area×joint fraction×depth; dry mass = wet mass×dry percentage.

Worked example

Enter these known values and leave the other values blank.

Show material details
Show grout material details
Length of the area (L)
2 m
Width of the area (W)
3 m
Length of tile (l)
9 cm
Width of tile (w)
9 cm
Gap width (g)
10 mm
Gap depth
10 mm
Grout density
1000 kg/m³
Dry material percentage
50 %
Weight per bag
2 kg
Total area to be tiled
6 m²
Area covered by a single tile
81 cm²
Grout volume
11400 cm³
Grout weight
11.4 kg
Dry material weight
5.7 kg
Number of bags needed
3 bags

Assumptions and limitations

  • The continuous repeating grid ignores edge cuts and individual perimeter joints. Density and dry percentage must come from the selected product; the presets are illustrative. The dry fraction is greater than zero and at most 100%.
  • Select compatible units and clear the quantity to solve before supplying the remaining measurements. Rounded purchase counts cannot uniquely recover a continuous dimension. Currency choices label amounts and do not convert exchange rates.

Common questions

How can I solve for a missing measurement?

Clear that field, then enter independent known values. Lock a known measurement to preserve it while changing another value. Procurement counts are rounded upward and cannot be reversed uniquely.

References

Enforce the stated physical and discrete input domains. Bookify replaces the captured rounded US gallon with the exact 3.785411784-liter definition. Bookify uses exact customary mass and volume definitions for density units, replacing rounded factors in the reference.

Explore cement and concrete calculators 🏦 or browse all construction calculators.