What Is a Raglan Sweater
A raglan sweater has diagonal seam lines running from the neckline to the underarm, creating four panels: front, back, and two sleeves. Unlike set-in sleeves with curved armholes, raglan construction uses continuous increases (or decreases) along four diagonal lines to shape the entire yoke in one piece.
Top-down raglan construction starts at the neck and works downward. You cast on a small number of stitches for the neckline, place four markers to define the raglan lines, and increase at each marker every other round. The yoke grows outward in all directions simultaneously until the chest and sleeve circumferences reach the right size. Then you separate the sleeves from the body and continue each section independently.
Top-down construction is beginner-friendly because you can try on the sweater as you go, adjusting length and fit before committing. There is no seaming — the entire yoke is worked in one piece. This construction also makes it easy to modify: add length to the body, shorten the sleeves, or adjust the neckline depth without ripping back the entire garment.
Raglan Increase Math
Standard raglan increases add 8 stitches every increase round — 2 stitches at each of the 4 raglan marker points. Increases are typically worked every other round (every right-side row when working flat, every 2nd round when working in the round).
The starting stitch count is divided among front, back, two sleeves, and 4 raglan stitches. A typical distribution for an adult crew neck at worsted gauge:
Size XS (32" bust): Cast on 80 stitches — Back 24, Front 24, each Sleeve 12, Raglan stitches 4×2=8 Size S (34" bust): Cast on 84 stitches — Back 26, Front 26, each Sleeve 12, Raglan stitches 8 Size M (36" bust): Cast on 88 stitches — Back 28, Front 28, each Sleeve 12, Raglan stitches 8 Size L (40" bust): Cast on 96 stitches — Back 30, Front 30, each Sleeve 14, Raglan stitches 8 Size XL (44" bust): Cast on 104 stitches — Back 34, Front 34, each Sleeve 14, Raglan stitches 8
The raglan stitches themselves (the 4 pairs at each marker) are not part of any panel — they form the visible diagonal lines. Each increase round adds 1 stitch to each side of each raglan line, so each panel grows by 2 stitches per increase round (one on the left raglan, one on the right).
Neckline Options
The neckline style changes how many stitches you cast on and how the first few inches of the yoke are shaped.
A crew neck is the standard round neckline. All stitches are cast on at once and increases begin immediately. The neck opening is typically 14-16 inches in circumference for an adult, designed to stretch over the head. Crew necks work well with a ribbed collar worked before the yoke increases begin.
A V-neck starts with fewer front stitches and adds extra increases at the center front over the first several inches. The front panel grows faster than the other panels, creating the V shape. You can control the V depth by how many extra increase rounds you work before the front catches up to the regular raglan increase rate.
A turtleneck begins exactly like a crew neck but adds 4-6 inches of ribbing above the yoke. The additional ribbing folds over to create the turtleneck collar. Cast on the same number of stitches as a crew neck — the turtleneck height is added on top.
The Raglan Calculator on fibertools.app lets you choose your neckline style and calculates the starting stitch distribution, increase frequency, and separation point for your exact gauge and measurements.
Sizing a Raglan from Body Measurements
To size a raglan sweater from scratch, you need four measurements: chest circumference, neck circumference, shoulder-to-underarm length (yoke depth), and desired ease.
Start with chest circumference plus ease. For a standard fit, add 2-4 inches of positive ease to actual chest measurement. A 36-inch chest gets a 38-40 inch sweater. Calculate the total body stitches needed: multiply target circumference by your stitch gauge. A 40-inch circumference at 5 stitches per inch = 200 total body stitches.
Next, calculate how many increase rounds you need. The yoke depth (shoulder to underarm) multiplied by your row gauge gives total yoke rows. Divide by 2 (increases happen every other round) to get the number of increase rounds. Each increase round adds 8 stitches total — 2 per panel per round. Check that the increase rounds produce enough stitches for both the body and the sleeves.
If the math produces sleeves that are too wide or a body that is too narrow, adjust the starting distribution. Give more stitches to the body panels and fewer to the sleeves at cast-on. The Gauge Calculator helps ensure your swatch measurements are accurate before committing to a full sweater's worth of knitting.
Frequently Asked Questions
How many stitches do I cast on for a raglan sweater? It depends on your gauge and neckline size. A typical adult crew neck raglan starts with 80-104 stitches at worsted gauge, divided between front, back, two sleeves, and 4 raglan marker stitches. The Raglan Calculator provides exact counts for your measurements.
How often do I increase for a raglan? Standard raglan increases happen every other round, adding 8 stitches per increase round — 2 at each of the 4 raglan points. Some patterns use every-round increases for a shallower yoke angle, but every-other-round is the standard.
When do I separate the sleeves from the body? Separate when the yoke depth reaches your shoulder-to-underarm measurement — typically 7-9 inches for adults. At this point, the sleeve stitch count should equal the desired upper arm circumference minus ease. Place sleeve stitches on hold and cast on a few underarm stitches to bridge the gap.
Can I make a raglan in crochet? Yes. Crochet raglans follow the same increase logic but typically use half double crochet or double crochet for the yoke. Increases are worked every round rather than every other round because crochet rows are taller. The Raglan Calculator works for crochet gauge.