How much less yarn does a vest use than a sweater?

A vest uses approximately 30-40% less yarn than a long-sleeved sweater of the same size. The savings come from not knitting sleeves. This makes vests ideal for expensive yarns or when you have limited yardage.

How do I shape the armholes on a vest?

Bind off 3-5 stitches at each underarm, then decrease 1 stitch each side every other row 5-8 times. The total armhole should be about 20-24cm deep for an adult. Finish the armhole edges with a few rows of ribbing or an applied i-cord.

What is a good ease for a vest?

Close-fitting vests (layering pieces): 2-5cm ease. Standard fit: 5-10cm ease. Oversized or fashion vests: 10-20cm ease. Fitted vests look best over a shirt; oversized vests work as standalone pieces.

Do I need to finish the armholes?

Yes, always. Unfinished armholes will curl in stocking stitch. Options include picking up stitches and knitting a few rounds of ribbing, working a single crochet edging, or applying an i-cord edge. The finish should be consistent with the neckline treatment.

Can I convert a sweater pattern to a vest?

Yes. Knit the body as written but stop at the armhole shaping. Shape armholes with bind-offs and decreases, then continue the front and back separately. Skip the sleeves entirely. Add armhole edging at the end. You will save the yarn for both sleeves.

KnitCalcs

Vest Calculator — Yarn and Sizing for Knitted Vests

Calculate yarn requirements and stitch counts for sleeveless vests and tank tops.

Chest Circumference

Body measurement

Vest Length

Shoulder to hem

Ease

Extra room for comfort

Stitch Gauge (per 10cm)

Yarn Weight

How We Calculate This

This calculator estimates yarn for sleeveless vests based on chest circumference, length, and yarn weight. Vests use approximately 30-40% less yarn than equivalent sweaters.

The formula

Body stitches: (Chest + ease) x stitch gauge
Yarn area: Finished chest x length + 10% for shaping
No sleeves: Saves ~35% yarn vs a full sweater

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates based on standard yarn weights and gauge. Results may vary with individual tension, yarn brand, and needle size.