Body Measurement & Size Selector
Match bust, waist and hip to pattern size charts.
Fullest part, arms down.
About 8 in below the waist.
Under the arms, across upper chest. 0 to skip.
US 12
Cut this size, then grade the other seams to your numbers.
- Bust maps to
- US 12
- Waist maps to
- US 12
- Hip maps to
- US 12
About This Tool
The Body Measurement and Size Selector turns your tape-measure numbers into a pattern size so you stop guessing which size to trace off the envelope.
You enter your bust, waist and hip, plus an optional high-bust reading, and the tool matches each to a standard misses chart.
It reports the size your body maps to at each point and tells you which single size to cut as the starting point.
The answer ends the habit of grabbing the size that matches one measurement and hoping the rest line up.
Whether you are sewing your first bodice or drafting for a fit, one clear size removes the doubt before you cut.
It also flags when a full bust adjustment is likely needed from the gap between your high and full bust.
Why Body Measurement & Size Selector Math Matters
Bodies rarely match one pattern size top to bottom, so a single number seldom fits everywhere.
Cutting to the smallest of your measurements leaves the garment tight across the fullest point.
Fitting the largest measurement first gives room where you need it, which you can then take in.
A size chosen from a tape reading beats trying on a half-sewn toile and unpicking seams.
Multi-size bodies benefit from blending between two sizes at the seams rather than picking one.
The high-bust reading reveals cup volume that a single bust number hides entirely.
Knowing your mapping size up front stops wasted fabric and discouraging refits.
The Formula
Each body measurement is matched to the nearest size on the chart, the largest resulting size is taken as the cut size, and the full-bust minus high-bust difference flags a possible bust adjustment.
- Full bust —
- the circumference across the fullest part of the chest with arms down
- Waist —
- the circumference at the natural waistline where the body bends
- Hip —
- the circumference around the fullest part of the seat about eight inches below the waist
- High bust —
- the circumference above the bust under the arms, used to gauge cup volume
Because patterns draft for a B cup, a full-to-high-bust gap over about three inches points to a graded or adjusted size rather than the plain chart pick.
Worked Example: Step by Step
- 1You measure a full bust of 38, a waist of 31 and a hip of 40 inches.
- 2You enter all three and a high bust of 35 for good measure.
- 3The chart maps your bust and hip to a US 12 while the waist sits near a US 12 too.
- 4The tool recommends cutting the US 12 as your starting size since it is the largest fit point.
- 5Because the sizes agree, it does not suggest blending between two sizes at the seams.
- 6Your full bust minus high bust is 3 inches, just under the flag, so it notes an adjustment is optional.
- 7You trace the size 12 and make a small bust tweak only if the toile feels tight across the chest.
How to Use This Calculator
- Measure your full bust, natural waist and full hip with a snug, level tape.
- Enter each number in inches into the calculator.
- Optional: add your high bust just under the arms for a cup read.
- Read the size each measurement maps to and the recommended cut size.
- If the sizes differ, plan to blend between them at the side seams.
- Sew a toile and confirm before cutting your fashion fabric.
Key Terms
- Full bust
- the measurement around the chest at its fullest point, the primary number for tops and dresses
- High bust
- the measurement above the bust under the arms, used to estimate cup size
- Ease
- the extra room built into a garment beyond the body measurement for movement and style
- Misses sizing
- the standard adult women's pattern scale that assumes a B cup and an average height
- Blend between sizes
- grading the pattern from one size at the bust to another at the waist or hip
- Full bust adjustment
- adding width and length to a pattern to fit a cup larger than the drafted B cup
Body Measurement & Size Selector Reference Table
| US size | Bust | Waist | Hip |
|---|---|---|---|
| 4 | 33.5 | 26 | 35.5 |
| 6 | 34.5 | 27 | 36.5 |
| 8 | 35.5 | 28 | 37.5 |
| 10 | 37 | 29.5 | 39 |
| 12 | 38.5 | 31 | 40.5 |
| 14 | 40 | 33 | 42 |
| 16 | 42 | 34.5 | 43.5 |
These figures are body measurements rather than finished garment measurements, so a pattern adds its own wearing ease on top of them. Always compare your tape numbers against both this chart and the finished measurements printed on the pattern envelope before you settle on the final size to cut.
Common Mistakes & Pro Tips
- Choosing a dress size off a ready-to-wear brand instead of measuring your body each time.
- Cutting to the smallest measurement, then finding the bodice cannot close over the bust.
- Ignoring the hip and cutting a top that fits until it rides up over the seat.
- Reading the tape over a thick sweater instead of the skin, adding inches to every number.
- Treating one chart as universal when Vogue, McCall and Burda each run a little differently.
- Cutting fashion fabric before checking the mapped size with a cheap test garment.
- Tracing one size line all the way around instead of rotating the pattern to a different size at the waist for a blended, flattering seam.
Real-World Use Cases
- Picking a starting size for your first commercial pattern.
- Re-checking your size after a change in training or life.
- Sewing fitted garments for a friend from their measurements.
- Deciding whether to grade between two sizes at the seams.
- Judging if a full bust adjustment is warranted before tracing.
- Buying the correct size for a group of matching dresses.
Body Measurement & Size Selector: Frequently Asked Questions
Which measurement decides the size I should buy?
Start from your largest of the bust, waist or hip reading, because it is easiest to take in than to let out. For tops and dresses the full bust usually rules, while for skirts the hip leads.
Why do my three measurements point to different sizes?
That is normal, since bodies are not the single size a pattern assumes. Blend between the two sizes at the side seams, grading out where you are fuller and in where you are narrower.
What is the difference between body and finished measurements?
A chart lists your body, while the garment adds ease on top for movement and style. Check the finished-garment numbers on the pattern so you know how loose the sewn piece will actually be.
When do I need a full bust adjustment?
When your full bust is more than about three inches above your high bust, the B-cup block will strain across the chest. That gap suggests a C cup or larger, so add width through a full bust adjustment.
Do all pattern companies size me the same?
No, and this surprises most sewists. The same body can land a size or two apart between brands, so always match your measurements to each company's specific chart rather than trusting one remembered number.
This page explains how the body measurement & size selector works, what each input means and where the numbers come from, so you can plan your next make with confidence.
Written by Bobbin & Form Editorial Team
Home sewists & machine-embroidery practitioners
Reviewed by Marie Delacroix
Custom sewist & machine-embroidery technician, 15 years at the machine
Formulas follow standard sewing and needlework references. Results are estimates — always confirm against your pattern and a pre-washed swatch.
Sources & further reading
- Threads Magazine — fabric cutting & yardage guides
- ISO 13934 — textile tensile & fabric property standards
- Your local fabric store's bolt-width charts