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Tile Grout Calculator

Work out how much tile grout you need by weight, volume and number of bags from tile size, joint width and depth, area and wastage.

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Tile Grout Calculator works straight from this page — free, instant, nothing to install. It sits under Building & renovation in our catalogue, alongside Tile calculator and Beam Load Calculator.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What does Tile Grout Calculator do?

Work out how much tile grout you need by weight, volume and number of bags from tile size, joint width and depth, area and wastage.

When would I actually use this?

Buying the right amount at the merchant: how many tiles, how much paint, how many bags of concrete, and what it all comes to.

What is the most common mistake?

Ordering the exact calculated quantity. Cuts, breakage and pattern matching mean a tiled surface needs about 10% spare, more on a diagonal layout or with a directional pattern — and a second batch rarely matches the first for colour, because the shade belongs to the firing run and not to the reference.

How is Tile Grout Calculator different from Tile calculator?

They sit next to each other but answer different questions: Tile calculator is the one to open when you need it to find out how many tiles you need for a floor or wall, including waste. Pick whichever matches what you're starting from — both are free.

Is there a tool for the next step?

Beam Load Calculator is the closest one after this: Estimate the maximum moment, deflection, bending stress and demand/capacity ratio of a beam for seven load cases — a preliminary check, not a design.

What else is worth having open alongside it?

Board Foot Calculator and Bolt Torque Calculator — they come up in the same task often enough to be worth a second tab.

Where do the figures come from?

The geometry is exact for the dimensions you enter. Coverage rates come from manufacturer datasheets and vary with the surface, the number of coats and how absorbent the substrate is.

Further reading

All guides →
How-toHow Much Tile and Grout You Actually NeedFloor area divided by tile area is the answer everyone reaches for, and it is always short. Count the grid instead, add the layout allowance, round to full boxes, keep attic stock — then derive the grout from the joint geometry rather than trusting the bag.How-toHow Much Carpet Do I Need? Why the Floor Area Is Not the Order QuantityA 13 by 17 ft room is 221 square feet of floor, but carpet comes off a 12 or 15 ft roll, so you buy 255 square feet and bin 34. Here is how to work out the order quantity your supplier will actually invoice.ExplainerR-Values, U-Values, and What an Insulation Number HidesR and U are reciprocals, and the two markets that read this site use different ones in different units — so an R-value quoted without its system means nothing. Worse, the number on the batt is not the number your wall achieves, because the studs are a parallel path.ExplainerWhere Household Water Actually GoesPeople picture taps and showers, and metered end-use studies say the biggest single line is somewhere else. Here is the ranked budget from named national agencies, plus the arithmetic that changes behaviour: the dripping tap, the running tap, and the shower flow rate at which a bath becomes the cheaper option.GuideEstimating a Beam's Safe Load: Span, Deflection and the Load CaseA calculator gives you an order of magnitude, and anything holding up a floor, a roof or people needs an engineer and a code check. Between those two facts there is a great deal worth knowing: which power of the span the deflection really follows, which loading case the tool assumes, and what L/360 is in fractions of an inch on a span you can measure.GuideWhat a Steel Plate, Bar or Tube Weighs — And What the Number Is ForSection area times length times density, for nine profiles and fourteen metals. What the calculator returns, why one figure covers every carbon-steel grade, and the two places its geometry is not the merchant's geometry.