tilegroutcalc

Backsplash tile calculator

Backsplash, 15 ft² · 3 × 6 in tile, straight lay

Width 120 in · Height 18 in

Buy 132 tiles

with 10% extra · 120 cover it exactly

Grout
1 × 25 lb bagUltracolor Plus FA

Your numbers

Tile size
Layout
Optional, from the carton
The backsplash surfaces laid with 3 × 6 in tiles, straight 18 in 120 in Width Whole tiles Cut at the edges 120 cover it · 132 to buy

The usual sizes here

4 sizes for this backsplash, 15 ft², in your layout.
SizeExactBuyGrout
3 × 6 in 120 132 1.4–2.1 lb
4 × 12 in 45 50 0.9–1.4 lb
2 × 2 in 540 594 2.7–3.9 lb
1 × 1 in 2,160 2,376 4.7–7.7 lb

Grout for this area

15 ft² at a 1/8 in joint, 1/4 in tile. Units include 10% extra.
ProductPoundsBuy
MAPEIUltracolor Plus FA computed 1.9 lb 125 lb bag
LATICRETESPECTRALOCK PRO Premium by volume sold by volume 1Full unit, 0.8 gal
Custom Building ProductsPolyblend Sanded computed 2.1 lb 125 lb bag
Custom Building ProductsPrism computed 1.4 lb 117 lb box

Other surfaces

Sources

Figures built September 2026.

Where these numbers come from (6)
  • Coverage: Custom Building Products, “Polyblend® Sanded Grout / TDS-129”, 3/22/2023, retrieved from https://www.custombuildingproducts.com/TDS/TDS-129.pdf on 2026-09-24. Chart values are restated as numbers; no text or table is reproduced.
  • Coverage: Custom Building Products, “Prism® Ultimate Performance Grout / TDS-128”, 6/20/2023, retrieved from https://www.custombuildingproducts.com/TDS/TDS-128.pdf on 2026-09-24. Chart values are restated as numbers; no text or table is reproduced.
  • Coverage: LATICRETE, “SPECTRALOCK® PRO Premium Grout†”, DS-681.0-0217, retrieved from https://cdn-global.laticrete.com/-/media/project/laticrete-international/north-america/product-documents/product-data-sheets/lds6810_spectralock-pro-premium-grout.ashx on 2026-09-24. Chart values are restated as numbers; no text or table is reproduced.
  • Grout waste: LATICRETE, “SpectraLOCK PRO Grout Installation & Maintenance Guide, TDS 400 PRO”, R 9 October 2009, retrieved from https://cdn-global.laticrete.com/-/media/project/laticrete-international/shared/files/support-and-downloads/technical-datasheets/tds400-pro.ashx?la=en on 2026-09-24. Chart values are restated as numbers; no text or table is reproduced.
  • Coverage: MAPEI, “Ultracolor Plus FA”, August 28, 2026, retrieved from https://cdnmedia.mapei.com/docs/librariesprovider67/products-documents/1_3000144_ultracolor-plus-fa_en-us_979a424a35724d82980fa0332f798319.pdf on 2026-09-24. Chart values are restated as numbers; no text or table is reproduced.
  • Overage: TileBuys, “How to calculate tile needed”, retrieved from https://www.tilebuys.com/pages/how-to-calculate-tile-needed on 2026-09-24. Chart values are restated as numbers; no text or table is reproduced.

Quantities are estimates for buying materials. Actual use depends on tile variation, joint depth and installation; manufacturers publish their coverage figures for estimating only.