How much stone veneer do I need?

Work out the wall area (length × height less openings), take off the flat area the corners replace, add waste and divide by the coverage of a box. The example wall, 216 sq ft with 18 ft of corners, needs 23 boxes of flats and 4 boxes of corners with 10% waste. Corners are bought separately, by the linear foot.

How do I convert corner linear feet to square feet?

Coronado's estimating guide says one linear foot of corner uses about 3/4 sq ft of wall on average, so 10 ft of corner replaces about 7.5 sq ft of flats. Halquist and Ply Gem use 1/2 sq ft, and larger profiles replace more. This calculator starts at 0.75 and lets you change it; at 0.5 the example wall has 207 sq ft of flats rather than 202.5 (23 boxes against 23), and the gap grows with the length of corner. Check your product's guide. An estimate, since your stone and layout decide it.

How many square feet are in a box of stone veneer?

It depends on the product. ProVia's calculator uses 10 sq ft for most profiles, 12.5 for dry stack and 5 for a tight-fit profile, and corner boxes of 6 linear ft. Treat 10 sq ft and 6 linear ft as typical and enter the figures on your box. With 12 sq ft boxes the example wall needs 19 boxes of flats instead of 23.

How much mortar do I need for stone veneer?

Quikrete states that an 80 lb bag of veneer stone mortar covers about 17 sq ft as a scratch coat at 1/2 in. Scratch coat and setting bed together are at least 7/8 in thick, so a bag covers about 9.7 sq ft of wall for both. The example wall, with waste, takes 25 bags. That scaling is our estimate: at 14 sq ft a bag it would be 30. The joints are not counted.

Do I need metal lath behind stone veneer?

Over wood framing and sheathing, manufactured stone is usually installed over a water-resistive barrier and metal lath, then a scratch coat. Over masonry or concrete, lath may not be needed. Lath comes in sheets of 27 × 96 in (18 sq ft); the example wall takes 14 counted over the full wall area with waste, which covers the laps. Follow your stone maker's instructions and local code.

How much waste should I add?

Coronado suggests 5 to 10% extra flats for cutting and trimming, and Ply Gem 10%. This calculator offers 10% and 15%; the 15% is an estimate of ours for many cuts, openings or an irregular pattern. At 15% the example wall needs 24 boxes of flats and 4 of corners. Stone also varies in color from box to box, so buying all of it at once is wise.

Do I subtract windows and doors?

Yes, enter each as an opening. A 3 × 4 ft window and a 3 × 6.7 ft door take 32.1 sq ft off the example wall, leaving 170.4 sq ft of flats and 19 boxes instead of 23. Stone returned around an opening needs extra cut pieces, which the waste covers.

What if the wall has no outside corners?

Set the corner length to 0. The whole 216 sq ft of the example wall is then flats: 24 boxes with 10% waste, and no corner boxes.

Is this for natural stone too?

The method is the same for thin natural stone veneer sold by the box, with flats and corners. Full-thickness natural stone laid with a cavity is a mason’s job and is quoted by the ton, which this does not cover. Heavier stone may need a different mortar, so use the product the maker names.

Stone Veneer Calculator: Boxes of Flats and Corners, Mortar and Lath

A wall 24 ft long and 9 ft high with two 9 ft outside corners has 216 sq ft to cover. Each linear foot of corner takes the place of about 0.75 sq ft of flat stone, so the 18 ft of corner stands in for 13.5 sq ft and the flats cover 202.5 sq ft. With 10% waste that is 23 boxes of flats at 10 sq ft a box, plus 4 boxes of corners at 6 linear ft a box. The mortar for the scratch coat and setting bed is 25 bags of 80 lb and the lath is 14 sheets of 27 × 96 in. Box sizes are typical, so enter the figures on your product.

Figures based on the sources listed belowUpdated 2026-10-16How we calculate

Wall length

Wall height

Waste

Standard (10%)Many cuts, openings or an irregular pattern (15%)Custom

Outside corners (linear ft)

Total height of every outside corner, added up: two 9 ft corners are 18. Corner pieces are sold by the linear foot. Leave at 0 if the wall has none.

Flats: sq ft per box (sq ft)

Typical is 10 sq ft, but it varies by product and joint style (ProVia lists 5, 10 and 12.5). Enter the figure on your product.

Corners: linear ft per box (linear ft)

Typical is about 6 linear ft a box (ProVia uses 6; some stone is packed at 5). Enter the figure on your product.

Flat area each corner foot replaces (sq ft)

A linear foot of corner takes the place of about 0.75 sq ft of flat stone (Coronado). Some makers use 0.5. A larger profile replaces more.

Mortar: sq ft per 80 lb bag at 1/2 in (sq ft)

Quikrete states about 17 sq ft per 80 lb bag of veneer stone mortar as a scratch coat at 1/2 in. The calculator scales it to the 7/8 in a scratch coat and setting bed total. Enter the figure on your bag.

Price per box (optional)

Buy 23 boxes

202.50 sq ft + 10% waste = 222.75 sq ft

Corner pieces: 4 boxes (≈ 19.8 ft)
Mortar, scratch coat and setting bed (80 lb bags): 25 bags (≈ 238 sq ft)
Metal lath (27 × 96 in sheets): 14 sheets (≈ 238 sq ft)

How this number is calculated

202.50 sq ft + 10% waste = 222.75 sq ft ÷ 10 sq ft per box = 23 boxes

Shopping list

Veneer stone mortar (80 lb)
Expanded metal lath 2.5 lb
Mortar bag for pointing
Diamond blade for stone cutting
Stone chipping hammer
Mixing paddle for drill
Weep screed

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Boxes and supplies by wall area

For a net wall area with no corners and 10% waste, at 10 sq ft of flats a box, 80 lb mortar bags at 9.7 sq ft of wall each (scratch coat and setting bed together) and 18 sq ft lath sheets. Worked by this calculator.
Net wall area	Flat boxes	Mortar bags	Lath sheets
100 sq ft	11	12	7
200 sq ft	22	23	13
300 sq ft	33	34	19
400 sq ft	44	46	25
600 sq ft	66	68	37
800 sq ft	88	91	49
1,000 sq ft	110	114	62
1,500 sq ft	165	170	92

Corner boxes by corner length

For the 24 × 9 ft example wall at 10% waste: 6 linear ft of corners a box, each linear foot replacing about 0.75 sq ft of flats (the flat area replaced is an estimate), and the flat boxes left to buy.
Outside corners	Flat area replaced (sq ft)	Corner boxes	Flat boxes
8 ft	6	2	24
16 ft	12	3	23
24 ft	18	5	22
32 ft	24	6	22
48 ft	36	9	20

Methodology & assumptions

Wall length and wall height give the wall area, less each door and window you enter as an opening. Stone veneer corners are sold separately by the linear foot, and a linear foot of corner takes the place of some flat stone on the wall. Coronado's estimating guide puts that at about 3/4 sq ft of flat per linear foot of corner on average (smaller profiles use less, larger ones more); Halquist and Ply Gem instead take half the corner feet off the flats, 1/2 sq ft. This calculator starts from 3/4 and the figure is an input. Flat area = wall area less corner feet × that figure. Waste is added to both: Coronado suggests 5 to 10% extra on flats for cutting and trimming and Ply Gem 10% overall, so 10% is the standard here, with 15% for many cuts or an irregular pattern (an estimate of ours, not a maker's figure). Flat boxes = flat area with waste ÷ sq ft per box, rounded up; corner boxes = corner feet with waste ÷ linear feet per box, rounded up. Box sizes are typical, not universal: ProVia's calculator uses 10 sq ft a box for most profiles (5 and 12.5 for some) and 6 linear ft a box of corners; a distributor lists 10 sq ft and 5 linear ft for another product. Both are inputs, so enter the figures on your product. Mortar and lath cover the whole wall, corners and flats alike, so they use the full wall area less openings, with waste. Quikrete states that an 80 lb bag of its veneer stone mortar covers about 17 sq ft as a scratch coat at 1/2 in. A scratch coat plus a setting bed should total at least 7/8 in (ICC-ES evaluation report ESR-2598 for a manufactured stone), and coverage falls in proportion to thickness, so one bag covers 17 × 1/2 ÷ 7/8 = 9.7 sq ft of wall for both layers. That scaling is geometry, not a maker's figure, and the mortar rate is an input. Mortar for the joints is not counted, since most veneer is installed with tight, dry-stack joints. Metal lath is 2.5 lb expanded galvanized lath in sheets of 27 × 96 in, 18 sq ft each, over the same area with waste, which also covers the laps. Whether lath is needed depends on the wall: over wood framing it goes on over a water-resistive barrier, and over masonry or concrete it may not be needed, so follow your stone maker's instructions and local code. Weep screed, flashing, fasteners, grout, sealer and the barrier are not counted. The metric toggle shows lengths in m and areas in m².

How to calculate how much stone veneer you need

Measure the wall. Measure the length and height of the wall to be covered, and each door and window to subtract as an opening.
Measure the outside corners. Add up the height of every outside corner to get the linear feet of corner pieces.
Take the corners off the flats. Each linear foot of corner replaces about 3/4 sq ft of flat stone. Subtract that from the wall area to get the flat area.
Add waste and divide by the box. Add 10% for cuts. Divide the flat area by the coverage on the flats box (10 sq ft is typical) and the corner feet by the linear feet in a corner box (about 6 is typical), and round up.
Work out mortar and lath. Use the full wall area with waste: about 9.7 sq ft of wall per 80 lb bag of veneer mortar for scratch coat and setting bed together, and 18 sq ft per sheet of metal lath.

Worked examples

Project	Result
24 ft wall, 9 ft high, two 9 ft corners, 10% waste	202.5 sq ft of flats + 10% → 23 boxes of flats, 4 boxes of corners, 25 bags of mortar, 14 sheets of lath
The same wall with a 3 × 4 ft window and a 3 × 6.7 ft door	170.4 sq ft of flats + 10% → 19 boxes of flats, 4 boxes of corners, 21 bags of mortar, 12 sheets of lath
The same wall with corners that replace 0.5 sq ft a foot	207 sq ft of flats + 10% → 23 boxes of flats, 4 boxes of corners
A chimney front: 8 ft wide, 12 ft high, 24 ft of corner, 12 sq ft flats boxes, 5 ft corner boxes, 15% waste	78 sq ft of flats + 15% → 8 boxes of flats, 6 boxes of corners, 12 bags of mortar, 7 sheets of lath
A foundation skirt: 60 ft long, 3 ft high, 30 ft of corner, 10% waste	157.5 sq ft of flats + 10% → 18 boxes of flats, 6 boxes of corners, 21 bags of mortar, 11 sheets of lath

Frequently asked questions

How much stone veneer do I need?: Work out the wall area (length × height less openings), take off the flat area the corners replace, add waste and divide by the coverage of a box. The example wall, 216 sq ft with 18 ft of corners, needs 23 boxes of flats and 4 boxes of corners with 10% waste. Corners are bought separately, by the linear foot.
How do I convert corner linear feet to square feet?: Coronado's estimating guide says one linear foot of corner uses about 3/4 sq ft of wall on average, so 10 ft of corner replaces about 7.5 sq ft of flats. Halquist and Ply Gem use 1/2 sq ft, and larger profiles replace more. This calculator starts at 0.75 and lets you change it; at 0.5 the example wall has 207 sq ft of flats rather than 202.5 (23 boxes against 23), and the gap grows with the length of corner. Check your product's guide. An estimate, since your stone and layout decide it.
How many square feet are in a box of stone veneer?: It depends on the product. ProVia's calculator uses 10 sq ft for most profiles, 12.5 for dry stack and 5 for a tight-fit profile, and corner boxes of 6 linear ft. Treat 10 sq ft and 6 linear ft as typical and enter the figures on your box. With 12 sq ft boxes the example wall needs 19 boxes of flats instead of 23.
How much mortar do I need for stone veneer?: Quikrete states that an 80 lb bag of veneer stone mortar covers about 17 sq ft as a scratch coat at 1/2 in. Scratch coat and setting bed together are at least 7/8 in thick, so a bag covers about 9.7 sq ft of wall for both. The example wall, with waste, takes 25 bags. That scaling is our estimate: at 14 sq ft a bag it would be 30. The joints are not counted.
Do I need metal lath behind stone veneer?: Over wood framing and sheathing, manufactured stone is usually installed over a water-resistive barrier and metal lath, then a scratch coat. Over masonry or concrete, lath may not be needed. Lath comes in sheets of 27 × 96 in (18 sq ft); the example wall takes 14 counted over the full wall area with waste, which covers the laps. Follow your stone maker's instructions and local code.
How much waste should I add?: Coronado suggests 5 to 10% extra flats for cutting and trimming, and Ply Gem 10%. This calculator offers 10% and 15%; the 15% is an estimate of ours for many cuts, openings or an irregular pattern. At 15% the example wall needs 24 boxes of flats and 4 of corners. Stone also varies in color from box to box, so buying all of it at once is wise.
Do I subtract windows and doors?: Yes, enter each as an opening. A 3 × 4 ft window and a 3 × 6.7 ft door take 32.1 sq ft off the example wall, leaving 170.4 sq ft of flats and 19 boxes instead of 23. Stone returned around an opening needs extra cut pieces, which the waste covers.
What if the wall has no outside corners?: Set the corner length to 0. The whole 216 sq ft of the example wall is then flats: 24 boxes with 10% waste, and no corner boxes.
Is this for natural stone too?: The method is the same for thin natural stone veneer sold by the box, with flats and corners. Full-thickness natural stone laid with a cavity is a mason’s job and is quoted by the ton, which this does not cover. Heavier stone may need a different mortar, so use the product the maker names.

Handy tools

Feet and Inches Calculator: Add up tape-measure readings in feet, inches and fractions into the decimal feet the fields take.