Ends and Picks Per Inch

Two directions, two measurements

A woven fabric contains two sets of yarns that cross each other. Warp yarns run along the fabric length, usually parallel to the selvedges, while weft yarns travel across its width. Ends per inch and picks per inch describe how closely these yarns are arranged.

An end is an individual warp yarn. Ends per inch, often shortened to EPI, means the number of warp ends within one inch measured across the fabric width. A pick is one insertion of weft. Picks per inch, or PPI, counts those insertions within one inch measured along the length.

The measuring direction can feel confusing at first because it crosses the yarns being counted. To count warp ends, move across them; to count weft picks, move along the warp direction. These measurements describe woven construction and are not the usual way to describe knitted loops.

What the numbers tell you

Imagine two cotton shirting samples made with similar yarns and the same weave. If one contains more ends and picks within the same space, its yarns are more closely packed. This can affect coverage, firmness and the room available for yarns to move.

However, density alone cannot predict how a fabric will perform. Thick yarns occupy more space than fine yarns, so a fabric with fewer threads may still feel substantial and provide good coverage. Fibre type, yarn twist, weave and finishing also influence the result.

EPI and PPI do not need to match. Different densities in the two directions can contribute to a ribbed appearance or different behaviour along the length and width. Equal numbers do not necessarily produce identical behaviour either, because warp and weft yarns may differ.

Counting a fabric sample

Begin with a relaxed woven swatch on a flat surface, without pulling it into shape. Identify the warp and weft before counting. An intact selvedge is useful for this; when it is missing, avoid assuming that the longer side of a cut swatch must be the warp direction.

A fabric counting glass or suitable magnifier helps you see individual yarns. Mark a measured inch across the warp ends and count each end once. Then measure an inch along the warp direction and count the weft picks crossing that distance, keeping the sample still.

Choose areas away from selvedges, creases and obvious defects, unless those features are what you want to investigate. Repeat the count in several places and record any variation. Counting over a shorter distance and scaling up can magnify errors, especially when yarns are uneven.

Follow the yarn paths rather than counting only the visible bumps on the surface. In twills and satins, yarns pass over several others, so the visible pattern can mislead a beginner. For doubled yarns or unusual constructions, record the counting convention instead of silently treating every visible strand alike.

Why the fabric stage matters

A loom arrangement and a finished fabric measurement describe different stages. Reed spacing helps position warp ends during weaving, but the finished EPI also depends on how the fabric width changes. Reed information alone should therefore not be treated as a finished fabric count.

Likewise, processing can change the distance between weft picks. If fabric contracts in length while retaining its picks, more picks occupy each inch. Width contraction can increase EPI through the same principle. Stretching or other dimensional changes can produce a different measured result.

When comparing samples, write down whether each is unfinished, finished or washed. Also note whether it was measured relaxed or under tension. A difference in density may reflect a change in dimensions rather than a different number of yarns originally woven into the material.

Using density in everyday comparisons

For a beginner comparing kurta fabrics, shirting or bedsheet samples in India, EPI and PPI provide useful construction details. Keep them beside observations about yarn size, weave, weight and handle. This makes a comparison more informative than choosing the sample with the largest numbers.

If a seller gives a combined thread count, ask how it was calculated and whether the separate EPI and PPI are available. Adding the two measurements hides the balance between directions. Any comparison also needs a consistent approach to counting plied or grouped yarns.

Build a simple swatch record with the fabric stage, identified directions, repeated counts and your observations of coverage and feel. Over time, compare samples that share similar yarns and weaves. This helps you recognise what density contributes without expecting one measurement to explain the whole fabric.