Ordering Tile for a Job: Lots, Shade Variation, Caliber and Extra Boxes

A tile dye lot, or simply a lot, is one production run of a tile, and ordering tile for a job comes down to four checks around it: the whole quantity, overage included, on one order, which keeps it to one production run; the shade variation rating, which tells you how much the pieces differ from each other; the caliber and thickness, which decide how the tile meets the floor next to it; and a few spare boxes kept after the job. This guide explains each one with real tiles from our range, from a V1 porcelain where every piece matches to a natural stone rated High.

In short: a lot is one production run, and two runs of the same tile can differ in shade and in size. The shade variation rating on the product page, V1 to V4 for porcelain and Low to High for stone, tells you how much variation to expect inside a single lot.

What a tile lot is

Porcelain and ceramic tile are pressed and fired in production runs. Each run comes out of the kiln with its own shade and its own caliber, and the cartons from that run are marked with the same lot or batch code. The term dye lot comes from carpet and fabric; in tile the word is lot, batch or shade, and it means the same thing: tiles from one run match each other more closely than tiles from two runs. Caliber is the actual size class of a production run, sorted after firing, so two runs of one nominal size can measure slightly differently.

Each production run can differ in shade, and buying the full quantity in one order keeps it to one run. A floor started from one lot and finished from a second one, ordered weeks later, can show the change in color where the two meet. The same holds for natural stone, where the lot is the block or the quarry bench the tile was cut from.

Term	What it means	Why it matters on a job
Lot or batch	One production run, one code on the carton	Two lots can differ in shade and size
Shade	The color of that run	Visible where two lots meet
Shade variation rating	How much pieces differ inside one lot	Sets what a sample can and cannot show
Caliber	The actual size class of a run	Two calibers of one nominal size differ slightly
Thickness	Listed in inches on the product page	Decides the height where two floors meet

Shade variation ratings: V1 to V4

Porcelain from MSI carries a shade variation rating, V1 to V4, the scale printed on our listings. The rating describes the range inside one lot, so it tells you how far a floor will depart from the single sample in your hand.

Rating	Meaning	Example from our range
V1	Uniform: the pieces look alike	Domino White 24x24 matte
V2	Slight: small differences in texture or pattern within one color	Dimensions Glacier 24x24 matte
V3	Moderate: one piece shows the colors of the line, but the amount varies piece to piece	Pietra Statuario 24x24 polished
V4	Substantial: pieces differ from each other by design, so a floor shows the full range	Kenzzi Zoudia 8x8 matte, Oxide Blanc 24x48 matte

The rating also changes how a lot difference shows. On a V1 floor every tile is close to every other, so a slightly lighter second lot stands out against the even field. On a V3 or V4 floor the variation inside the lot is already wide, and a V4 like Kenzzi Zoudia is meant to look different from piece to piece. The single-lot point applies at every rating; on a V1 floor a mismatch is easiest to see.

For a V3 or V4 tile, one sample shows one piece, not the range. Product photos of a finished room show more of it, and the full range appears once the boxes are opened side by side. Samples are in our tile samples, and the guide to sampling a project covers what a sample settles.

Natural stone: Low, Medium and High

Natural stone is rated on its own scale of Low, Medium and High. Variation in stone is the material itself: veins, fossils and color shifts that formed in the quarry, so no two pieces are the same. A Low rating means a stone with an even ground color; a High rating means the color, veining or texture moves noticeably from piece to piece. The rating measures how far one piece can differ from the next.

Stone	Size and finish	Rating	Thickness
Carrara White marble	12x24 honed	Low	0.38 in
Arabescato Carrara marble	12x24 honed	Medium	0.38 in
Silver travertine	18x18 honed	Medium	0.50 in
Crema Marfil Classic marble	18x18 polished	High	0.63 in
Multi Classic slate	12x24 gauged	High	0.50 in

With stone, the single lot matters for the same reason as with porcelain, and a High stone has the widest range of all. Our marble tiles list the rating on each stone, and the travertine tiles do the same.

Caliber and rectified edges

Caliber is the real size class of a production run. Tile shrinks a little in the kiln, and the factory sorts each run by its actual size, so two lots of a 12x24 tile can measure slightly differently. Within one caliber the pieces match in size; across two calibers they differ slightly.

Rectified tile has its edges ground after firing, which brings every piece to the same size with square, sharp edges. The product page lists the edge where the data has it: the Attitude Warm Sand 12x24, for example, is rectified, at 9 mm thick. Rectified edges even out size, not shade, so a rectified tile can still differ in shade between lots.

Thickness where floors meet

The thickness on the product page decides how a tiled floor meets the floor beside it, under a door or at a stair. These are listed thicknesses from tiles in this guide and its sister guides:

Product	Format	Listed thickness
Katavia Bleached Elm vinyl plank	6x48	0.08 in
Sande Cream porcelain	48x48	0.35 in
Domino White porcelain	24x24	0.38 in
Pietra Calacatta porcelain	12x24	0.39 in
Dimensions Concrete porcelain	24x48	0.50 in
Kenzzi Zoudia porcelain	8x8	0.55 in
Shell Reef limestone paver	36x36	1 1/4 in

Two tiles from different series can differ in height even at the same nominal size, so on a job with two floors meeting, the thicknesses go on the order sheet next to the quantities. Trim in our moldings is listed with its own thickness and color on each product page, so it goes on the same sheet.

How many extra boxes to order

Overage covers the cut pieces at the edges, a few breakages and spares. The quantity calculator on our product pages has an option to add 15% for cuts and waste, and our tile calculator guide works with these planning allowances by layout:

Layout	Planning allowance
Straight or offset	10%
Diagonal, or 24x48 and larger	15%
Herringbone or chevron	20%

A worked example: a 180 square foot floor in an offset layout at 10% needs 198 square feet. In Pietra Calacatta 12x24, at 16 square feet per box, that is 12.4 boxes, so 13 boxes and 208 square feet; the same floor in herringbone at 20% needs 216 square feet, so 14 boxes. Our tile calculator guide works these through with real box sizes, from a 180 square foot kitchen to a 2,000 square foot floor on four pallets.

After the job, the unopened spare boxes are worth keeping. Each production run can differ in shade, so a spare box from the original order is the closest match for a cracked tile replaced later. On a commercial job, the spare boxes left with the owner can go on the order as their own line.

When a lot is already limited

Some tile is sold as a finite lot. Our small lots are the last boxes of tiles in our Virginia warehouse, each one sized for a room or a wall, and a lot that sells out cannot be reordered. For those, the quantity on the page has to cover the job with its overage before the order goes in. At the other end, large volume porcelain tiles gathers the lines suited to a job that needs a lot of one tile.

Ordering for clients through the trade program

For contractors, designers and builders who order for several jobs a year, the Pros Club is our trade program. It is free to apply, trade pricing is applied automatically at checkout when you are logged in, and a dedicated trade specialist helps with selection, quotes and project support, such as checking quantities and lots on a large order. Our trade program guide walks through it, and the large format tile guide covers the formats where a single piece weighs up to 73 pounds.

Tile Lot and Shade FAQ

Is a tile dye lot actually dyed?

No. Tile cartons carry a lot or batch code instead; "dye lot" is the same idea under a borrowed name. Glazed porcelain takes its color from glazes and inks fired onto the surface, and natural stone takes it from the ground, so neither is dyed.

Is shade variation a defect?

No. A V4 tile like Oxide Blanc or Kenzzi Zoudia is listed with substantial variation because the look depends on it, and a High stone like Multi Classic slate shows several colors in one box. A floor in these tiles that looks livelier than one sample is the rated range at work.

How do I tell whether boxes come from the same lot?

The code on each carton label tells you. Matching codes on every box of a delivery mean one run; the label is also where the caliber code appears when the factory prints one, and both can be compared before any box is opened.

How much extra tile should I order?

For a quick figure, multiply the floor area by 1.10 for a straight layout, then divide by the box coverage and round up: a 50 square foot bathroom becomes 55 square feet, or 4 boxes of 16 square feet. Our how much tile do I need guide covers diagonal, herringbone, mosaics and trim.

Where do I find the rating for a tile?

In the product details on each page where the data has it. Porcelain from other suppliers may not list a rating, and for those, room photos on the product page are the closest view of the range.

Does a sample show the shade range?

Only partly. A sample is cut from a single piece, so it settles the material, finish and base color in your own light. For a V3, V4 or High stone, the range across a whole floor shows once several boxes are open side by side.