AI Size Chart Generator for Clothing Tech Packs
An AI size chart generator writes the measurement table of a garment for you: the points of measure, graded across every size, with a tolerance on each line. On The New Black AI it lives inside the tech pack. Open the size chart, press the small sparkle under its arrow, and the AI writes the chart from your photos and from what the pack already says, for 1 credit. You see the whole chart before it is kept, and you can give it your own sizing and grading sheet so it follows your scale rather than a standard one.
Updated 13 November 2026
- 1Open SIZE CHART with AI
- 2Choose the sizes and the unit
- 3Read the chart, then keep it
How it works
Open SIZE CHART with AI
In your tech pack, find the size chart section and press the sparkle under its arrow on the right. The window reads what the pack already holds: the photos, the description, the construction. Add up to four photos of the garment if the pack has none, and a few words if you want: « oversized hoodie », « for size M: half chest 62 cm, body length 70 cm ».
Choose the sizes and the unit
Type the size range the way your brand writes it: « XS, S, M, L, XL », « M to 3XL », « 4, 6, 8, 10, 12 ». Choose centimetres or inches. If you have a sizing and grading sheet, add it as a PDF or a picture (JPG, PNG or WebP).
Read the chart, then keep it
The AI returns the whole chart: every point of measure with its code, its title, its tolerance and its value in each size. A value that breaks the logic of its own row is marked to check. Nothing is written into your pack until you press Replace the chart.
How the AI grades a chart
A size chart is one grading, so the AI writes it whole rather than cell by cell. It follows the rules a pattern maker would:
- Every point of measure has its own standard code, such as CH for chest, CB for centre back, SL for sleeve length, SW for shoulder width.
- Each measurement grades with its own increment. Chest and sleeve length never move by the same step, and no line keeps the same value across all sizes.
- Sleeve length grades by about 0.5 cm a size for knitwear and 1 cm for woven garments.
- A measurement you give is a fact: if you say the half chest is 62 cm in M, it stays 62 cm in M and the other sizes are graded from it.
- Where nothing tells the AI a value, it does not make one up for the factory to act on.
Your own sizing and grading sheet
Brands that already sell have a scale of their own, and a chart graded on an industry average would not match the rest of the range. Add your sizing sheet in the window and the AI reads it first: it takes your size scale and your grading increments, then measures what this garment needs. It does not copy the numbers of another garment. A sheet for trousers still teaches it your scale when you write a jacket. If the sheet cannot be read, the AI stops and says so, rather than grading quietly on the standard scale.
Change a chart you already have
When the chart is filled, the same window corrects it. Ask in plain words: « sizes M to 3XL », « convert to inches », « add the pocket measurements », « the collar height is 4 cm in M ». The AI changes only what you asked. Values you did not mention come back exactly as they were; new rows and changed cells are marked, and any row that would disappear is listed in red before you decide.
The other sections with AI
The size chart is one of four sections with their own AI window in the tech pack. Description and Notes are written or corrected the same way, for 1 credit each. The bill of materials can be read from your supplier quotes and spec sheets for 2 credits. Every window works however the pack was started, with AI or by hand, and the finished pack exports to PDF with the size chart in it.
What it does not do
It writes the factory's size chart, the measurements of the garment itself. It is not a size guide widget for shoppers on a store, and it does not recommend a size to a customer. The chart is a first draft: check it against a fitting sample before bulk production, as you would with any chart.
Who it is for
Designers and small brands writing their first tech packs without a technical designer, and teams that want every style of a collection graded on the same scale. For the whole document, from photos or sketches, see the AI tech pack generator. If you are new to tech packs, the guide to tech packs explains what each section is for.
Frequently asked questions
How much does the AI size chart cost?+
1 credit for each chart written or corrected. Typing the chart by hand, editing it and exporting the PDF cost nothing, and a new account comes with free credits at signup.
Can it grade from one size I already measured?+
Yes. Write the measurements you have for one size, for example « for size M: half chest 62 cm, body length 70 cm », and the AI keeps them exactly and grades the other sizes from them.
Can it follow my brand's sizing?+
Yes. Add your sizing and grading sheet as a PDF or an image in the window. The AI takes your scale and your increments from it instead of an industry standard.
Does it work in inches?+
Yes. Choose centimetres or inches before writing, or ask « convert to inches » on a chart that is already filled, and every value and tolerance is converted.
Will it overwrite the measurements I typed?+
No. You see the whole proposed chart first, with the new and changed cells marked, and nothing is replaced until you press Replace the chart.
Can I use it for kids or plus sizes?+
Yes. Type the range as you sell it, « 4 to 12 years » or « M to 3XL », and the AI grades the chart across those sizes.
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