Upholstery Fabric Yardage Glossary: Terms Every Shop Should Know

35% of upholstery fabric ordering errors come from misunderstanding terminology. A client asks for a "railroaded fabric," you say yes, and then neither of you is certain whether the pattern will run the right way. Or a supplier quotes you a price per yard for "54-inch goods" and you don't realize that's the total width, not the usable width.

These aren't rare situations. They happen in shops at every experience level, and they're preventable. Here are the terms that matter most for fabric yardage work, defined clearly.

What does pattern repeat mean in upholstery?

Pattern repeat is the distance between identical points in a repeating pattern on fabric, the measurement from where one motif begins to where the exact same motif begins again.

If you see a stripe or floral that looks the same every 9 inches, the pattern repeat is 9 inches. Every panel you cut that needs to show the pattern at the same position (centered the same way, matching at seam lines) must start at the same point in the repeat.

The repeat directly affects how much extra fabric you need. A 9-inch repeat means you may waste up to 8.99 inches on any given panel to get to the right starting point. Across a full sofa with 8 to 10 panels requiring alignment, repeat waste adds 2 to 3 yards to your total.

Horizontal repeat: The repeat measurement running across the fabric width

Vertical repeat: The repeat measurement running along the fabric length

For the full guide, see Pattern Repeat Guide for Upholstery.

What is railroading in fabric?

Railroading means running fabric horizontally rather than vertically on a piece of furniture. Standard orientation puts the fabric's length (selvage edges) running top to bottom on the piece. Railroaded fabric runs the length horizontally, from one side of the piece to the other.

The term comes from freight transport: the fabric runs "on rails" sideways across the piece.

When railroading helps: On wide sofa backs, sectional backs, or any surface wider than your fabric's usable width. Railroading eliminates the need for seaming because the fabric's length (typically 50 to 60 yards on a bolt) can run across the full width of the piece. It can save 1.5 to 2 yards on a sofa back.

When railroading fails: On fabrics with directional patterns (stripes running up the bolt) or pile fabrics where nap direction is critical. Railroading a striped fabric turns horizontal stripes into vertical ones, or vice versa. On velvet, railroading changes the direction the pile faces.

Fabric labeled "railroad friendly" or "no pattern/no nap" can safely be turned sideways.

What does nap direction mean for fabric?

Nap is the surface texture on pile fabrics, velvet, chenille, microfiber suede, created by fibers that stand up from the base weave. These fibers lean in one direction, which creates different visual effects depending on which way the light catches them.

Nap direction refers to which direction the fibers are lying. When you stroke a velvet fabric one direction, it looks lighter and brighter. When you stroke it the other direction, it looks darker and deeper.

For upholstery, all panels on a piece must be cut with the nap running in the same direction. If one panel has nap running down and another has nap running up, the two panels will look different colors in the same light. This is visible and unprofessional.

Standard nap direction convention: Nap runs "down" on vertical surfaces (pile faces toward the floor on upright panels). On horizontal surfaces like seats, nap can run front-to-back or in whatever direction the upholsterer determines will look best.

Nap direction adds 10 to 15% to yardage because you can't rotate panels for layout efficiency, all panels must run the same direction.

See the Velvet Nap Direction Guide for detailed guidance.

What is seam allowance in upholstery?

Seam allowance is the fabric beyond the stitch line, the extra material between the edge of your cut panel and the seam itself. It's what gets hidden inside the seam when two panels are sewn together.

Standard upholstery seam allowance is 0.5 inch. Some materials use different standards:

Leather and vinyl: 0.375 inch (smaller because they don't fray and sewing machines can feed them more precisely)
Heavy pile fabrics: 0.75 inch (to avoid bulk at the seam)
Thin or fray-prone fabrics: 0.625 inch (extra security against unraveling)

Seam allowance must be added to every edge of every panel where a seam occurs. If you calculate panel dimensions from the finished size without adding seam allowance, all your panels will be undersized.

What is railroaded vs non-railroaded fabric?

This refers to whether the fabric can be turned sideways. Fabrics are designed for standard orientation (pattern runs vertically up the bolt) or are specifically suitable for railroading (no directional elements that would look wrong when turned).

Non-railroaded fabrics: Those with directional patterns, stripes, or pile. Must be used in standard orientation.

Railroaded fabrics: Solid colors, some non-directional geometrics, performance fabrics with no nap. Can be used in standard or railroaded orientation at the upholsterer's discretion.

What is a selvage edge?

The selvage (also spelled "selvedge") is the finished edge that runs along the length of a fabric bolt. It's the tightly woven edge that prevents the fabric from fraying as it comes off the loom.

Usable width excludes the selvage. A 54-inch fabric typically has 52 to 53 inches of usable width once you account for approximately 0.5 to 1 inch of selvage on each edge.

When calculating yardage, always use usable width, not total width. If you calculate panels at 54 inches and your usable width is 52 inches, you'll cut panels slightly too small.

What is a half-drop repeat?

A half-drop repeat (also called a drop repeat) is a pattern where alternating columns of the motif are offset vertically by half the repeat height. This creates a diagonal visual movement across the fabric.

Calculating yardage for a half-drop repeat requires extra waste because you can't align panels from one column of repeats with panels from an adjacent column, they're at different heights. Budget an additional 0.5 repeat per panel for half-drop alignment waste, on top of standard repeat waste.

What is Wyzenbeek rub count?

The Wyzenbeek test measures fabric abrasion resistance. A machine rubs a fabric sample with a cotton duck cloth until the fabric shows wear or breaks down. The number of "double rubs" (one back-and-forth = one double rub) completed before failure is the Wyzenbeek number.

Higher Wyzenbeek numbers mean more durable fabric:

15,000 double rubs: Light residential use
25,000-30,000: Heavy residential use
100,000+: Commercial grade

For the full explanation of how rub counts affect fabric selection, see Upholstery Fabric Rub Count Guide.

What is tuck-in allowance?

Tuck-in allowance is extra fabric added to panels that disappear under or behind adjacent surfaces, typically the inside back tucking under the seat deck, and the inside arm tucking under the seat cushion.

Standard tuck-in allowance is 3 to 4 inches per edge that tucks. Without tuck-in allowance, panels will pull free from their tucked position during normal use, creating gaps and visible fabric edges.

Always add tuck-in allowance when measuring inside back and inside arm panels. It's not optional, it's what holds those panels in position without stapling.

What is decking fabric?

Decking fabric (also called seat decking or deck cloth) is a secondary, lower-quality fabric used on the seat deck, the base surface under the seat cushions. Because this surface is never seen when the cushions are in place, it doesn't need to be the main upholstery fabric.

Using decking fabric on the deck instead of main fabric saves money and the main fabric for visible surfaces. It's a standard practice in professional upholstery and should be factored into your material order, separate from your main fabric yardage.

What is bias cut in upholstery?

Cutting on the bias means cutting fabric at a 45-degree angle to the grain. Bias-cut fabric stretches more than on-grain fabric because the weave is under diagonal tension.

Bias cutting is used for welt/cording strips when you want the welt to curve smoothly without puckering. On curved seams, bias-cut welt conforms to the curve more naturally than welt cut on the grain.

Bias cutting generates more waste than on-grain cutting because the 45-degree strips don't nest efficiently against the panel cuts.

TL;DR

Upholstery Glossary yardage depends on fabric width, construction details, pattern repeat, and nap direction.
Plain 54-inch fabric requires a baseline calculation plus 10-15% waste allowance for a standard upholstery glossary job.
Patterned fabric adds 20-35% to base yardage depending on repeat size and the number of cutting zones that must align.
Directional fabrics add 15-25% over plain fabric because layout optimization is restricted by nap direction.
Always verify fabric width before finalizing yardage; COM fabric often comes in non-standard widths.
Calculating yardage at the quote stage, not mid-job, eliminates reorders and protects your profit margin.

Using the Pattern Repeat Calculator

For calculating pattern repeat waste on any specific piece, the pattern repeat calculator handles both horizontal and vertical repeat dimensions. For a complete reference on all yardage calculation methods, the Fabric Yardage Calculator covers every piece type with built-in terminology.

Frequently Asked Questions

What does pattern repeat mean in upholstery?

Pattern repeat is the distance between identical points in a repeating design on fabric. It determines how much extra fabric you need to ensure pattern alignment across panels. A 9-inch vertical repeat means you may waste up to 9 inches per panel to start at the right position in the repeat.

What is railroading in fabric?

Railroading means rotating fabric 90 degrees so the length runs across the piece rather than top to bottom. It allows wide pieces like sofa backs to be covered without seaming. It only works on fabrics with no directional pattern or pile.

What does nap direction mean for fabric?

Nap direction is the direction the surface pile of a fabric (velvet, chenille, microfiber) leans. All panels on a piece must be cut with nap running the same direction. If panels have different nap directions, they'll appear different shades in the same light, a visible defect.

What is the biggest factor in yardage variation for this piece?

Pattern repeat is the biggest source of yardage variation. On plain fabric, the baseline calculation plus a 10-15% waste buffer is usually sufficient. Add a 13-inch pattern repeat and you may need 15-20% more. Add a 27-inch pattern repeat and the additional yardage can be 25-35% over the plain fabric calculation. Nap direction is the second-largest factor, typically adding 15-25% over plain fabric because layout optimization is restricted.

Sources

National Upholstery Association
Association of Master Upholsterers and Soft Furnishers (AMUSF)
Upholstered Furniture Action Council (UFAC)
Furniture Today (trade publication)

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