How many 12×24 tiles for a 10×12 room?

Data checked October 2026

Short answer

120 sq ft of 12×24 tile takes 72 tiles — 11 boxes — including 15% for cuts, plus 4 bags of thinset and 1 × 25-lb bag of grout.

Area: 10 × 12 ft = 120 sq ft.
Each 12×24 tile (actual 23.5 × 11.7 in) plus a 1/8 in joint covers 1.94 sq ft; 120 × 1.15 ÷ 1.94 = 72 pieces → 11 boxes of 7.
Thinset: 4 × 50-lb VersaBond with a 3/4 × 9/16 × 3/8 U-notch held at 30° (42 sq ft per bag, plus back-buttering).
Grout: about 6.3 lb of Keracolor S for a 1/8 in joint 0.354 in deep — 1 × 25-lb bag.
Backer: 9 sheets of HardieBacker ¼ and about 476 screws, set in 2 bag of thinset.
Materials come to about $660; installed by a pro, about $1,966–$2,425.

Adjust it to your exact job

What are you tiling?

Project

Over a wood subfloor, 1/4 in cement board set in thinset is the usual base.

Surfaces

Length

= 10' · 3.05 m

Width

= 12' · 3.66 m

Tile

Tile size

Floor & Decor Venato 12×24: 11.70 × 23.50 in, 9 mm, 7 pieces = 13.44 sq ft per box (other brands pack 8).

Grout joint

Layout

You need

11boxes of 12×24

72 tiles for 120 sq ft incl. 15% extra · 147 sq ft in the boxes

Area to tile: 120sq ft
Tile cost: $366about $33.28 per box
Thinset: 4bagsVersaBond · ¾ U · 30°
Grout: 6.3 lbKeracolor S: 1 × 25-lb bag
Backer board: 9sheetsHardieBacker ¼ · 476 fasteners

Back-butter large tile

Tile over 15 in needs a skim of thinset on its back as well as the troweled bed. That adds about 0.5 bag here — already included. Lift a tile now and then to check you have 80% contact (95% in showers and outdoors).

Other tile sizes, same area

Pieces and boxes by tile size (recommended waste, carton counts as listed)
Tile	Pieces	Boxes	Tile cost
Mosaic 12×12 sheets	132	132 sheets	$1,979
4×12 subway	392	27	$408
6×24 plank	144	14	$430
12×12 ceramic	134	8	$130
12×24 porcelain	72	11	$366
24×24 porcelain	36	9	$417
24×48 large format	18	6	$552

Hiring it out?

Installed tile runs about $1,966–$2,425 for 120 sq ft (homewyse, May 2026). Your materials above come to about $660.

Shopping list

11 boxes 12×24 porcelain tile72 pieces incl. 15% waste$366
4 bags VersaBond thinset, 50 lb3/4 × 9/16 × 3/8 U-notch held at 30°, back-buttered$79.96
1 units Keracolor S grout — 25-lb bag$14.48
9 sheets HardieBacker 1/4 in cement board, 3×5 ft$121
1 boxes Backer fasteners — box of 750$38.44
2 rolls 2 in alkali-resistant mesh tape — 50-ft roll$11.98
2 bags Modified thinset under the board (1/4 in square notch)$27.98
1 each Notched trowel, 3/4 × 9/16 × 3/8 U-notch held at 30°$11.49
72 pcs Tile spacers, 1/8 inabout one per tile

Estimated total$671

Cost estimate

Tap a price to use your store's

12×24 tile
11 boxes × $$2.49/sq ft × 13.37 sq ft per box
$366
VersaBond
4 bags × $
$79.96
Keracolor S 25-lb bag
1 units × $
$14.48
HardieBacker ¼
9 sheets × $
$121
Screws, box of 750
1 boxes × $
$38.44
Mesh tape, 50-ft roll
2 rolls × $
$11.98
Thinset under board
2 bags × $
$27.98
Notched trowel
1 each × $
$11.49

Materials total$671

Typical U.S. prices (Floor & Decor and others) checked October 2026. Tap any price to enter your store's.

Did this answer your question?

Compare

The same 120 sq ft in other tile sizes

Tile	Pieces	Boxes	Thinset bags	Tile cost
Mosaic 12×12 sheets	132	132 sheets	2	$1,979
4×12 subway	392	27	3	$408
6×24 plank	144	14	4	$430
12×12 ceramic	134	8	3	$130
12×24 porcelain	72	11	4	$366
24×24 porcelain	36	9	4	$417
24×48 large format	18	6	4	$552

How this was worked out

A 10×12 room in 12×24 tile looks best with the long side parallel to the longest wall and a ⅓ offset, not ½, to limit lippage.

The 15% extra is the recommendation for straight layout with 24-in tile. The full boxes leave 5 spare pieces — keep them for repairs.

The full method, material data and tips are on the main tile calculator page.

Similar jobs

Other sizes people check

Sources

Data behind this answer

Floor & Decor carton specs — Venato 12×24, Napoli 24×48, Bright White Ice 3×6 — 12×24 = 11.70 × 23.50 in, 7 per box; 24×48 = 23.50 × 47.08 in, 3 per box; 3×6 subway 80 per box · checked October 2026
Floors Center carton specs — Daltile 12×12, 24×24, 6×24, 4×4 and MSI 4×12 — 12×12 = 11.81 in, 17 per box; 24×24 = 23.62 in, 4 per box; 6×24 planks 11 = 10.23 sq ft; 4¼ wall tile 100 = 12.5 sq ft; MSI 4×12 15 = 4.85 sq ft · checked October 2026
Floor & Decor tile category pricing (Ypsilanti, MI store) — 12×24 porcelain median $2.49/sq ft, 24×48 $3.99, porcelain overall $2.99, ceramic $0.99, mosaic sheets $14.99 · checked October 2026
Daltile FAQ and MSI FAQ — overage and attic stock — buy about 10% extra as attic stock; MSI: 10–15% by pattern plus 5–10% for future repairs · checked October 2026
Custom Building Products — VersaBond family sell sheet SS215 (9/26R) and TDS-119 — VersaBond 85–95 sq ft at 1/4 in, 60–67 at 1/4×3/8, U-notch 34–38 (45°) / 42–47 (30°); VersaBond LHT, LITE (35 lb = 50 lb) · checked October 2026
Custom grout data — Polyblend Plus TDS-360, Grout Card CC25, Prism SS160, Fusion Pro TDS-242 — Polyblend Plus 12×12×3/8 at 1/8 in: 348 sq ft per 25 lb; Prism 17 lb = 25 lb coverage; Fusion Pro 199 sq ft/gal at 12×12×3/8, 1/8 in · checked October 2026
MAPEI TDS — Keracolor S (Feb 2026), Keracolor U, Ultracolor Plus FA (Aug 2026), Kerapoxy CQ (Apr 2026) — Coverage tables used to calibrate the grout factor per product; Kerapoxy CQ joints 1/16–3/8 in only · checked October 2026
James Hardie — installing HardieBacker on floors and walls — fasteners every 8 in over the whole floor sheet, 1/4 in square-notch thinset under floor board, 1/8 in gaps, 2 in mesh tape; studs max 16 in o.c. · checked October 2026
Custom RedGard — TDS-104 — waterproofing 55 sq ft/gal (two coats at 110), IAPMO pan liner 40, crack prevention 100; 1 and 3.5 gal pails · checked October 2026
Celebration Hardware — RedGard LQWAF1 1-gal — $74.99 per 1-gal pail (regular price, Oct 2026) · checked October 2026
Floor & Decor backer board, screws and mesh tape listings — Durock 3×5 $12.50–$21.00, HardieBacker $13.40 / $17.50; 1-1/4 in screws 750 ct $38.44, 185 ct $13.87; 2 in tape 300 ft $15.99 · checked October 2026
homewyse — cost to install tile floor, wall tile and backsplash (May 2026) — floor $16.38–$20.21, walls $11.48–$21.27, backsplash $28.31–$49.78 per sq ft installed · checked October 2026
Fixr — shower tiling cost guide (updated Aug 29, 2025) — porcelain shower walls $17–$46/sq ft installed; diagonal and herringbone +20%, running bond +10–15%; tear-out $2–$5/sq ft · checked October 2026

Short answer

120 sq ft of 12×24 tile takes 72 tiles — 11 boxes — including 15% for cuts, plus 4 bags of thinset and 1 × 25-lb bag of grout.

Area: 10 × 12 ft = 120 sq ft.

Each 12×24 tile (actual 23.5 × 11.7 in) plus a 1/8 in joint covers 1.94 sq ft; 120 × 1.15 ÷ 1.94 = 72 pieces → 11 boxes of 7.

Thinset: 4 × 50-lb VersaBond with a 3/4 × 9/16 × 3/8 U-notch held at 30° (42 sq ft per bag, plus back-buttering).

Grout: about 6.3 lb of Keracolor S for a 1/8 in joint 0.354 in deep — 1 × 25-lb bag.

Backer: 9 sheets of HardieBacker ¼ and about 476 screws, set in 2 bag of thinset.

Materials come to about $660; installed by a pro, about $1,966–$2,425.

Adjust it to your exact job

What are you tiling?

Project

Over a wood subfloor, 1/4 in cement board set in thinset is the usual base.

Surfaces

Length

= 10' · 3.05 m

Width

= 12' · 3.66 m

Tile

Tile size

Floor & Decor Venato 12×24: 11.70 × 23.50 in, 9 mm, 7 pieces = 13.44 sq ft per box (other brands pack 8).

Grout joint

Layout

You need

11boxes of 12×24

72 tiles for 120 sq ft incl. 15% extra · 147 sq ft in the boxes

Area to tile: 120sq ft
Tile cost: $366about $33.28 per box
Thinset: 4bagsVersaBond · ¾ U · 30°
Grout: 6.3 lbKeracolor S: 1 × 25-lb bag
Backer board: 9sheetsHardieBacker ¼ · 476 fasteners

Back-butter large tile

Other tile sizes, same area

Pieces and boxes by tile size (recommended waste, carton counts as listed)
Tile	Pieces	Boxes	Tile cost
Mosaic 12×12 sheets	132	132 sheets	$1,979
4×12 subway	392	27	$408
6×24 plank	144	14	$430
12×12 ceramic	134	8	$130
12×24 porcelain	72	11	$366
24×24 porcelain	36	9	$417
24×48 large format	18	6	$552

Hiring it out?

Installed tile runs about $1,966–$2,425 for 120 sq ft (homewyse, May 2026). Your materials above come to about $660.

Shopping list

11 boxes 12×24 porcelain tile72 pieces incl. 15% waste$366
4 bags VersaBond thinset, 50 lb3/4 × 9/16 × 3/8 U-notch held at 30°, back-buttered$79.96
1 units Keracolor S grout — 25-lb bag$14.48
9 sheets HardieBacker 1/4 in cement board, 3×5 ft$121
1 boxes Backer fasteners — box of 750$38.44
2 rolls 2 in alkali-resistant mesh tape — 50-ft roll$11.98
2 bags Modified thinset under the board (1/4 in square notch)$27.98
1 each Notched trowel, 3/4 × 9/16 × 3/8 U-notch held at 30°$11.49
72 pcs Tile spacers, 1/8 inabout one per tile

Estimated total$671

Cost estimate

Tap a price to use your store's

12×24 tile
11 boxes × $$2.49/sq ft × 13.37 sq ft per box
$366
VersaBond
4 bags × $
$79.96
Keracolor S 25-lb bag
1 units × $
$14.48
HardieBacker ¼
9 sheets × $
$121
Screws, box of 750
1 boxes × $
$38.44
Mesh tape, 50-ft roll
2 rolls × $
$11.98
Thinset under board
2 bags × $
$27.98
Notched trowel
1 each × $
$11.49

Materials total$671

Typical U.S. prices (Floor & Decor and others) checked October 2026. Tap any price to enter your store's.

Tile

Pieces

Boxes

Thinset bags

Tile cost

Mosaic 12×12 sheets

132

132 sheets

$1,979

4×12 subway

392

$408

6×24 plank

144

$430

12×12 ceramic

134

$130

12×24 porcelain

$366

24×24 porcelain

$417

24×48 large format

$552

How this was worked out

A 10×12 room in 12×24 tile looks best with the long side parallel to the longest wall and a ⅓ offset, not ½, to limit lippage.

The 15% extra is the recommendation for straight layout with 24-in tile. The full boxes leave 5 spare pieces — keep them for repairs.

The full method, material data and tips are on the main tile calculator page.