Grading Chart Template: Grade Rules, Increments

Grading is the set of rules that turns one fitted pattern into a whole size range. The grading chart is where those rules live: how much each point of measure changes between one size and the next, and where the rules stop being uniform. It is a short document and it determines whether customers who are not your sample size can buy from you reliably.

This covers how grade rules are written, typical increments, what changes at the extremes of a range, and how grading is checked before production.

The template

Copy this layout into a spreadsheet: one row per point of measure, one column per size step, the base size named, and a tolerance on every line. Rows 1, 2 and 8 are filled in with example values; the empty rows are for your own rules.

Example in centimetres, size range XS to XL, base size M. Rows 1 and 2 use the example grade shown on our pattern grading page (full chest 5.0 cm and body length 1.6 cm per size step, tolerance 1.0 cm); row 8 is a fixed detail. Real grade rules come from your own size chart.

What is a grading chart?

A table of increments describing how each measurement changes between sizes.

It records rules, not values

The measurement chart holds the actual dimensions for each size, while the grading chart holds the differences between them. Keeping the rules visible as their own document is what makes a size range auditable rather than a column of numbers somebody typed.

It applies to a fitted base

Grading starts from an approved base size and works outward in both directions. Everything the base gets wrong, the grade repeats in every size, which is why the sequence is not negotiable.

It is the same across a range

Applying the same underlying rules to every style means a medium fits the same body throughout your catalogue. Styles graded independently produce a range where customers cannot predict their own size, which drives returns more than almost anything else.

It is a short document

Most garments need fewer than fifteen graded points, and the whole chart fits on one page. Its brevity is not a sign that it is unimportant; it is the page that decides whether most of your customers get a garment that fits.

How are grade rules written?

As a plus or minus value per point, per size step.

Increments, not percentages

A grade rule says the full chest grows 5.0 centimetres between sizes, not that the whole garment scales by a percentage. Percentage scaling enlarges everything uniformly, including details that should never change, which produces sleeves and necks that are visibly wrong at the ends of the range.

One rule per point of measure

Each numbered point on the measurement chart gets its own increment, because body dimensions do not grow together. Chest and hip change substantially between sizes while neck width and rib depth barely move at all.

Steps can vary across the range

The increment between small and medium does not have to equal the increment between extra large and double extra large, and in most real size charts it does not. Writing the chart with a column per step rather than one global number makes those variations explicit.

Direction matters at the base

Grading outward from the middle of the range keeps both extremes a similar distance from the fitted size. Grading upward from the smallest size means the largest size is many steps removed from anything that was ever tested.

What are typical increments?

A few centimetres of girth per size, a centimetre or two of length, and little or nothing on details.

Girth grows most

Chest, waist, hip and hem typically move by two to five centimetres per size in adult ranges, depending on how wide the range is and how many sizes it spans. The example on our grading page uses 5.0 cm of full chest per size step. These are the measurements customers notice first when a size is wrong.

Lengths grow modestly

Body length and sleeve length commonly move by one to two centimetres per size (1.6 cm of body length in the same example), because people of different girths are not proportionally different in height. Over-grading length is a frequent error and it makes larger sizes read as boxy and long.

Widths grow least

Neck width and cuff openings move by about half a centimetre per size, and shoulder width only a little more. In the example on our grading page the high point shoulder moves 0.25 cm sideways per size step on each side (0.5 cm across the neck) and the shoulder point 0.65 cm (1.3 cm across both shoulders). These small increments are where badly executed grading shows first, because a neck that grows with the chest looks obviously wrong.

Fixed details do not grow

Rib heights, placket widths, pocket depths and label sizes usually stay identical across the whole range. Scaling them produces a garment that looks like an enlarged photograph rather than a bigger version of the same product.

When should rules change across a range?

At the extremes, and whenever the body stops changing proportionally.

Extended sizes need their own rules

Continuing the same arithmetic far beyond the fitted base distorts proportions, because bodies do not grow uniformly in every dimension. Larger size ranges typically need wider girth increments with unchanged or barely changed length and width increments.

Very small sizes have the same problem

Grading a long way downward produces garments whose lengths and widths are proportionally too large for the girth. The smallest size in a wide range is worth its own fit sample rather than being trusted to the rules.

A second base is sometimes correct

Ranges spanning many sizes are often graded from two fitted bases, one for the core range and one for the extended range. This costs an extra pattern and a fit round and it is usually cheaper than the returns it prevents.

Category changes the answer

A relaxed jersey top tolerates crude grading and a fitted shirt or a trouser does not. The tighter the garment sits to the body, the more the grade rules matter and the less room there is for approximation.

How does grading relate to the size chart?

The size chart states the target, the grade rules implement it.

The size chart comes first

Deciding which body measurements each size is intended to fit is a commercial decision, and it should be made before grading rather than emerging from it. Grading without a target size chart produces a range whose sizes mean whatever the increments happened to be.

Ease is designed, not graded

The difference between body measurement and garment measurement is the ease in the style, and it is normally constant or slowly changing across the range. Ease that grows with every size is how larger sizes end up unintentionally oversized.

Published charts should be derived

The size chart shown to customers should be generated from the approved measurement and grading charts rather than written separately. Two independently maintained documents drift apart, and the gap arrives as returns.

Consistency beats precision

A range where every style is graded to the same chart, slightly imperfectly, serves customers better than one where each style is graded perfectly to its own logic. Predictability is the thing being sold.

Who produces the grading?

A pattern maker or grader, working from the approved base.

It is a specialist task

Grading is a distinct skill within pattern making, and in larger operations it is often a separate role. The rules look simple written down and applying them to pattern pieces without distorting curves and armholes is not. Our pattern grading service grades your approved base pattern for you.

Software applies the rules

Pattern systems hold grade rules as data attached to pattern points, which makes them repeatable and auditable across styles. Manual grading remains perfectly valid and is considerably slower to revise. For where grading fits among the other tools, see our guide to fashion CAD.

Factories will grade for you

Many manufacturers will grade a base pattern as part of taking on the work, and the resulting size range then reflects their house standard. That is convenient and it means your sizing is somebody else's decision.

Own the graded set

Whoever performs the grading, the full nested pattern set should end up in your possession alongside the written rules that produced it. Rebuilding grading when you change factory means paying for the same work twice and accepting a size range that fits differently from the one your customers already know.

How is grading checked?

By sampling the extremes and measuring the full nested set.

Sample the largest and smallest

Fit is approved in the base size, and the ends of the range are where grading errors become visible. One sample at each extreme catches most grading problems for a fraction of the cost of finding them in bulk.

Measure the nested pattern

Every graded size can be measured on the pattern before anything is cut, and those numbers should match the measurement chart exactly. Discrepancies found here are free and the same discrepancies found at inspection are not.

Check the curves, not just the points

Grading moves individual points and the curves between them have to stay smooth, particularly at armholes, necklines and crotch seams. A numerically correct grade with distorted curves produces a garment that measures right and does not fit.

Compare against a known garment

Measuring a well-fitting commercial garment in the same size gives you a sanity check that costs nothing. It will not tell you your grade is right and it reliably tells you when it is badly wrong.

What goes wrong most often?

Grading too early, uniform scaling, and no extreme-size sample.

Grading before fit approval

The most expensive common error in the whole specification process, because it propagates a base-size problem across an entire range and has to be redone completely. It happens almost always because a schedule looked tight.

Scaling instead of grading

Applying a single percentage to every dimension enlarges details that should never change at all, producing necks, cuffs, plackets and pockets that are visibly wrong in the larger sizes. It is quick, it looks entirely reasonable in a spreadsheet, and it is not grading in any sense a pattern maker would recognise.

Inconsistent rules across styles

Styles graded to different underlying logic produce a catalogue in which a customer who takes a medium in one product has no reason to expect the medium in another to fit. The problem is almost invisible from inside the business and extremely visible in return rates and in customer messages.

No sample at the extremes

Trusting rules without testing them at the ends of the range means discovering grading errors in the finished order. Two extra samples is among the cheapest insurance available in development.

How do tolerances interact with grading?

They do not change with size, but the risk does.

Tolerances are per point, not per size

A chest tolerance of one centimetre applies in every size, because it describes how much the fabric and process can vary rather than how big the garment is. Scaling tolerances with size is not standard and usually indicates confusion with grading.

Small increments plus wide tolerances collide

If a neck grows half a centimetre per size and carries a half-centimetre tolerance, adjacent sizes overlap within tolerance. That is worth knowing before an inspection surfaces it as an apparent defect.

Knits need attention here

Jersey moves more than wovens, so knit tolerances are wider, and wider tolerances against small grade increments make adjacent sizes harder to distinguish. This is a real constraint on how finely a knit range can be graded.

Review both together

The measurement chart and the grading chart should be read as one document when tolerances are set, because the interaction only appears when both are in view. Setting them separately is how the overlap problem gets missed.

How does grading differ by garment category?

The points change, and so does how much error the category forgives.

Jersey tops forgive a lot

A relaxed t-shirt or sweatshirt has enough ease that a slightly imperfect grade still produces a wearable garment across the range. This is why most brands start here and why the grading lessons learned on jersey do not transfer cleanly to anything fitted.

Trousers forgive almost nothing

Waist, hip, thigh, knee, leg opening and both rises all have to move together, and a rise graded independently of the hip produces a trouser that fits at the waist and nowhere else. Trouser grading is where buying the skill rather than approximating it pays for itself most clearly.

Shirting sits in between

A shirt grades reasonably predictably in the body and much less so at the collar, cuff and armhole, where small increments and tight curves interact. Collar sizes in particular tend to need their own logic rather than tracking the chest.

Outerwear grades over layers

A jacket is worn over other garments, so its girth increments have to account for what is underneath rather than for the body alone. Grading outerwear as though it sits on skin produces larger sizes that will not close over a sweater.

How should the grading chart be presented?

One page, one unit, next to the measurement chart.

Keep it beside the values

The grading chart and the measurement chart describe the same thing from two directions, and reading them together is the only way to spot an increment that does not match the values. Filing them separately is how a chart with a typo survives to production.

State the base size explicitly

Every reader needs to know which size was fitted and which direction the grade runs, because that determines how much confidence to place in each end of the range. A chart without a named base is a chart nobody can audit.

Show every step, not an average

A single global increment hides the places where the rule changes, and those places are usually the interesting ones. A column per size step costs nothing and makes the whole logic visible at a glance.

Note the exceptions

Fixed details, second bases and any point that deliberately does not grade should be marked as such rather than left blank. A blank cell reads as an oversight and will generate a question or, worse, an assumption.

What does grading cost?

Less than pattern making, and it is quoted separately: our pattern grading is $149 or $229 per style.

It is priced per style

Grading is normally quoted as its own line rather than being bundled with first pattern, because it happens later in the process and only once fit has been approved. Budgeting for it from the beginning avoids an invoice that feels unexpected at exactly the wrong moment.

Complexity drives the price

A jersey top with seven graded points is a short job and a lined jacket with thirty is not. The number of points and the number of pattern pieces set the cost far more than the number of sizes does. Our pattern grading is priced the same way: $149 per style for up to 10 pieces and $229 for 11 pieces or more, with up to 5 sizes included.

Extra sizes are cheap, extra bases are not

Adding a size to an existing grade is a small cost (on our grading, $25 for each size beyond the five included), while introducing a second fitted base for an extended range means another pattern and another fit round. That is the decision worth thinking about rather than the size count.

Redoing it is the real cost

Grading an unapproved base and then having to regrade is the scenario that turns a modest line item into a significant one. Sequencing correctly is cheaper than any negotiation over the rate.

Working with GarmentSpec

Our studio team in the USA grades your approved base pattern, digital or paper, to your size range. Pattern grading is $149 per style for up to 10 pieces and 5 sizes, or $229 for 11 pieces or more, with $25 for each extra size, in three to five working days once the base pattern is in. You get the graded nest, DXF-AAMA and PDF files for every size, the grade rule table and the graded spec, with one revision. No grade rules yet? We write them from your size chart.

No base pattern yet? A first pattern is $349, $549 or $899 per style by complexity, in five to seven working days, with one correction round after your fit sample. The tech pack, first pattern and grading to 5 sizes together cost from $649 per style. A tech pack on its own is $299 per style, in three to five working days, with graded points of measure and tolerances.

Every file is yours outright and not tied to any manufacturer, so the same grading can be used wherever you produce. We do not sew samples and we do not place production.

Frequently asked questions

Sources

• Techpacker, tech pack content standards
• QIMA, AQL apparel inspection standards
• Browzwear, 3D apparel design and pattern workflow

GarmentSpec builds factory-ready tech packs: technical flats, bill of materials, and graded points of measure with tolerances. $299 per style, 3 to 5 working days.