Aluminum foil container dimensions: how to read top-out, top-in, base, depth, rim, and nesting pitch
Aluminum foil container dimensions: how to read top-out, top-in, base, depth, rim, and nesting pitch
Two aluminum foil trays can both be sold as 220 x 160 x 45 mm and still fail the same lid, machine pocket, meal layout, or carton. The disagreement usually starts with the measurement line. One supplier may quote the outside rim. Another may quote the inside opening. A third may round a catalog name that was never meant to control a sealing tool.
Written by Qixin Packaging for food brands, importers, distributors, co-packers, and filling-line teams comparing aluminum foil container drawings before sample or bulk approval.
Last Updated: July 2026 | Reading Time: 14 minutes
Short answer: one length-width-height line is not enough
Read aluminum foil container dimensions as separate layers: top-out, top-in, base, height or depth, rim or flange, corner geometry, lid match, and nesting pitch.
The most critical layer depends on the job. A heat-seal line cares about the flange and sealing land. A meal assembler cares about the inner opening and usable depth. A denester cares about tray variation, rim shape, stacking distance, and how the nest releases.
Do not accept a universal tolerance copied from another catalog. Put the measurement method, sample count, and agreed limits on the drawing or approval record.
Qixin’s broader aluminum container size guide helps buyers choose a capacity and format. The narrower problem begins when aluminum foil container dimensions must be compared for replacement: what does each line mean, and which lines decide whether the tray is actually interchangeable?
Aluminum foil container dimensions dictionary
Keep these fields beside the supplier drawing and sample trays. The measurement setup matters because a semi-rigid rim can move when a caliper is squeezed or when a tray is held in the air.
Opening and cavity dimensions
| Drawing field | What it should describe | Practical measurement | What can fail if it is wrong |
|---|---|---|---|
| Top-out length and width | The maximum outside span across the upper rim or flange. | Support the empty tray on a flat surface. Measure the named straight axis without compressing the rim. | Lid family, sealing-tool pocket, machine lane, carton orientation. |
| Top-in length and width | The clear opening inside the rim at the top. | Measure between the inner rim reference points shown on the drawing. | Food loading area, garnish layout, scoop access, actual opening. |
| Base length and width | The lower footprint or defined bottom panel, not the top opening. | Use the drawing’s base reference. Ribs and rounded corners can make a visual estimate unreliable. | Food footprint, conveyor support, shelf contact, stability. |
| External height | The outside vertical distance from the support plane to the stated rim reference. | Place the tray on a flat plate. Measure vertically without pushing the base or rim. | Shelf height, machine pocket, carton stack, visual fill. |
| Inner depth | The internal vertical distance from the inner base reference to the top-in or fill reference. | Use a depth gauge or a straight reference across the named rim points. Do not assume it equals external height. | Food height, headspace, lid contact, portion presentation. |
Edge, geometry, and stack dimensions
| Drawing field | What it should describe | Practical measurement | What can fail if it is wrong |
|---|---|---|---|
| Rim, curl, or flange | The edge construction and the surface used by a board lid, crimp, snap lid, or seal film. | Record the rim style, cross-section, flat sealing width, and corner condition. Width alone is incomplete. | Closure fit, seal continuity, denesting, safe handling. |
| Corner radius and wall angle | The transition geometry between straight walls, corners, top opening, and base. | Use the drawing profile or template. A ruler across the tray is not enough. | Lid corners, food placement, cavity fit, actual capacity, release from nest. |
| Nesting pitch | The average added height for each additional tray in a repeatable stack. | Measure one tray and a counted stack under the same light settling method, then calculate the average pitch. | Denesting rhythm, stack count, bag length, carton height, freight cube. |
| Capacity | A measured volume under a stated method, usually brimful or a defined usable fill. | Measure separately. Do not calculate a tapered, ribbed tray as a rectangular box. | Portion fit, headspace, spill risk, cost comparison. |
i2r’s published AS221078 product data is a useful real example. It lists a top-out size of 239 x 167 mm, a top-in size of 220 x 148 mm, a base of 210 x 138 mm, a depth of 37 mm, and a capacity of 1078 ml. Those numbers belong to one manufacturer product, not a universal tray. Their value here is the field structure: opening, outside rim, base, depth, and capacity are separate facts.
Top-out, top-in, and base answer three different questions
Top-out is the number most likely to appear in a short catalog. It is useful because lids, sealing tools, machine pockets, and cartons often meet the tray at its widest upper edge. It still does not tell the buyer how much clear opening remains inside the rim.
Top-in describes that opening. A tray can keep the same top-out family while changing the rim construction or wall profile. The food-loading area may shrink even though the catalog name looks unchanged. A fillet, pastry, insert, or compartment card may fit one tray and catch on the other.
The base controls the lower footprint. Two trays with the same top opening can taper differently. The one with the smaller base may nest more tightly or feel different when full. It may also give the food less flat support.
For an air fryer, a small base does not establish fit: the rim and height also occupy space inside the appliance. Our foil tray air-fryer size and fit guide compares those outside dimensions with manufacturers’ published dish-size limits.
A quick rim projection check, with limits
On a symmetric straight side, a buyer can estimate the horizontal projection on each side with this calculation:
Approximate projection per side = (top-out dimension – top-in dimension) / 2
For the i2r length example, `(239 – 220) / 2 = 9.5 mm` per side. That is an arithmetic check, not a sealing-land specification. A full curl, folded hem, rounded corner, interrupted rim, or non-flat edge needs its own cross-section and measured sealing surface.
Depth, external height, food height, and lid clearance are not synonyms
A supplier drawing may use height or depth without showing the reference points. Ask. External height can include the bottom form and upper rim. Inner depth may stop at the internal base and top-in reference. Neither number automatically tells you how high the meal can sit under a board lid, dome, or seal film.
Food height is an operating value. A mound of rice, a bone-in portion, or a bakery product can sit above the average fill line. The tray may pass a water-capacity test and still touch the lid. For that reason, the drawing review should stay connected to the usable-capacity and headspace test.
Measure the actual filled product at the tallest point. Then close the final lid or film and repeat the storage, stacking, delivery, freezing, or reheating route. A dimension drawing can narrow the risk. It cannot simulate a meal.
Rim, curl, flange, and sealing land decide the closure route
The outside rim is easy to photograph and surprisingly easy to misdescribe. A rolled edge for a board lid does a different job from a flat flange for heat-seal film. A snap-on plastic lid needs the intended bead or engagement geometry. A crimped board lid needs enough controlled edge to fold over without tearing or opening at the corner.
Pactiv Evergreen’s two-piece container catalog lists container and lid match codes separately. That is the right discipline. A nominal 7-inch or 9-inch name is useful for browsing, but the matched code or a physical fit test controls approval.
Buyer note: For heat sealing, ask for the flat sealing-land width and corner condition rather than relying on the outside flange width. For board or plastic lids, confirm the matching code and test the final lid from the intended supplier.
Use the separate aluminum foil container lids guide to choose the closure family. The drawing then has to define the geometry that lets that closure work.
Corner radius, wall angle, ribs, and compartments change the usable shape
A drawing can match at top-out, top-in, base, and depth while still producing a different tray. Corner radii change the usable rectangle. Wall angle changes how quickly the cavity narrows. Base ribs change the flat contact area. Compartment dividers remove volume and can rise close to the lid.
Corner shape, wall angle, and ribs also change hand feel and forming behavior, but the drawing should first answer a simpler question: where can the food actually sit? A buyer replacing a tray for a fixed meal should compare a top view and section view, then place the real food or product insert into both samples.
A photograph is useful for identifying the family. It is poor evidence for corner radius, divider height, sealing land, or bottom-panel size. Ask for a dimensioned drawing when any of those features controls the route.
The critical dimension changes with the machine and lid
| Use route | Dimensions to control first | Physical proof after drawing review |
|---|---|---|
| Board lid and crimp | Top-out, rim profile, corner shape, lid blank and matched code. | Close filled samples and check every corner after handling. |
| Heat-seal film | Flange top-out, flat sealing land, flange level, corner radius, tool cavity. | Seal on the production tool with final film and inspect continuity. |
| Snap-on dome | Engagement rim, bead or curl, corner geometry, lid code. | Fit lids from the final lid lot and check lift, stack, and transport. |
| Automatic denester | Top-out, rim edge, stacking lugs, nesting pitch, geometry variation. | Run a counted stack at the intended line speed. |
| Manual meal assembly | Top-in, base, inner depth, divider shape, food clearance. | Fill and close the actual meal at operating portion weight. |
| Retail shelf and carton | Top-out, height, counted stack height, lid height, bag and sleeve allowance. | Pack the final count in the final carton and measure the closed case. |
JKT, a tray-denesting equipment company, lists measurements and variation, stacking distance, stacking lugs, tray edge, material, thickness or weight, and desired line speed among the inputs used to size a denesting tool. That list is more realistic than treating top-out as the only machine dimension.
There is no useful tolerance without a reference and a consequence
A tolerance statement needs three parts: which dimension, how it is measured, and what happens when the value moves. Writing one blanket number beside the drawing can look precise while leaving the closure-critical field uncontrolled.
A useful aluminum foil container dimensions record therefore puts the reference points and measurement method beside each controlled limit.
The reviewed technical sources do not establish one cross-industry dimensional tolerance for all semi-rigid aluminum foil containers. Product families, rim styles, tooling, foil condition, and measurement setups differ. Treat the final limits as an agreement between buyer and supplier, supported by samples and process capability.
| Risk family | Fields that may need tighter control | How to set the limit |
|---|---|---|
| Closure critical | Top-out at flange, sealing land, rim profile, corner geometry, flange level. | Use matched lid or sealing-tool trials and supplier capability data. |
| Machine critical | Top-out, base, rim edge, stacking lugs, pitch, orientation features. | Use the machine pocket and a line trial across several stacks. |
| Food fit critical | Top-in, base panel, inner depth, divider height, corner radius. | Use the actual portion, insert, pastry, or product geometry. |
| Carton critical | Counted stack height, nesting pitch, top-out, lid stack, bag allowance. | Build the final pack and verify carton dimensions and compression. |
For bulk inspection and defect classification, move to the separate aluminum foil container quality inspection checklist. The drawing guide defines what to measure. The inspection plan defines how a shipment is accepted.
Metric and imperial conversion: exact factor, honest precision
NIST defines one inch as exactly 25.4 mm. The calculation is straightforward:
inches = millimeters / 25.4
millimeters = inches x 25.4
The conversion factor is exact. The product dimension may not be. If a drawing states `220 mm`, converting it to `8.661417 in` does not make the tray accurate to six decimal places. A practical dual-unit drawing might show `220 mm (8.66 in)`, while the controlled unit and tolerance remain clearly stated.
Keep one unit system as the controlling drawing. Use the second for buyer convenience. Repeatedly converting and rounding between versions can create a false mismatch.
Nesting pitch: the dimension that predicts stacks, cartons, and denesting
One tray may be 45 mm high, but 100 nested trays are not 4,500 mm high. Each added tray drops into the one below and adds only the stacking distance. That added height is the nesting pitch.
Average nesting pitch = (stack height – single-tray height) / (tray count – 1)
Estimated stack height = single-tray height + (tray count – 1) x nesting pitch
Worked example
The numbers below are hypothetical. They show the calculation method and are not a Qixin product specification.
- Single-tray height: 45 mm.
- Measured height of 20 settled trays: 102 mm.
- Average nesting pitch: `(102 – 45) / 19 = 3 mm`.
- Estimated height of 100 trays: `45 + 99 x 3 = 342 mm`.
The 342 mm result is an unbagged estimate. The final carton needs room for the bag, end protection, lid stack if included, board variation, and an agreed compression condition. Measure more than one stack because foil trays can settle differently after handling.
Nesting pitch connects this drawing to landed cost. A small change repeated across 100 or 200 trays can change carton height and CBM. Use the result with the landed-cost, carton, and freight guide after the final pack has been built.
Why two nominally similar trays may not be replacements
The hypothetical values below show how a buyer can compare drawings before asking whether Tray B can replace Tray A.
| Field | Tray A | Tray B | Buyer consequence |
|---|---|---|---|
| Top-out | 220 x 160 mm | 220 x 160 mm | Catalog names look interchangeable. |
| Top-in | 202 x 142 mm | 198 x 138 mm | Tray B has a smaller loading opening. |
| Base | 180 x 120 mm | 172 x 112 mm | Tray B narrows faster and gives less flat food support. |
| Inner depth | 41 mm | 39 mm | The same portion may lose lid clearance. |
| Closure | Matched board lid A220 | Flat heat-seal flange | The closure systems are different despite the same top-out. |
| Nesting pitch | 3.0 mm | 3.8 mm | A 100-piece stack differs by about 79 mm before packing allowance. |
Tray B may still be a good product. It is simply not a drop-in replacement until the meal, lid, machine, and carton route have been retested.
Sample measurement record for drawing approval
Keep the record plain enough that a warehouse, supplier, and buyer can repeat it. Do not hide the reference points inside a photo without labels.
| Record field | What to write | Evidence to attach |
|---|---|---|
| Identity | Supplier, product code, mold code, drawing revision, sample date. | Tray marking and full drawing. |
| Measurement setup | Tool, resolution, support surface, reference points, sample count. | Labeled top, side, and base photos. |
| Individual dimensions | Top-out, top-in, base, external height, inner depth, rim or flange. | Minimum, maximum, and observed range for the checked samples. |
| Stack record | Tray count, stack height, settling method, calculated pitch. | Photo of counted stack beside scale. |
| Fit tests | Lid code, sealing tool, denester, food portion, carton count. | Closed samples, line result, filled sample, final carton. |
| Decision | Approved, conditional, or rejected, with the exact reason. | Signed approval and retained sample reference. |
The existing aluminum foil container specification sheet guide covers the full RFQ, including material, capacity, lids, cartons, and documents. Use this measurement record as the geometry attachment.
Common drawing mistakes that create expensive replacements
Comparing only the catalog name. A 1000 ml or 9-inch name does not define the opening, base, closure, or usable fill.
Using top-out as food space. The rim occupies part of that width. Food fit starts with top-in, base, depth, corner shape, and the real portion.
Assuming external height equals inner depth. The bottom form and rim references can make the two values different.
Approving a lid from nominal size. Use the matched code or test the final lid on production samples.
Giving every dimension the same tolerance. A food-layout dimension and a sealing-land dimension do not carry the same consequence.
Measuring one soft tray in the hand. Support the tray, avoid squeezing the rim, check several samples, and record the setup.
Ignoring nesting pitch. The single-tray height cannot predict stack count, carton height, or denesting behavior.
Converting units with false precision. More decimal places do not improve the original drawing.
What to send Qixin when replacing or customizing a tray
Send the current tray, matching lid, drawing, and the process detail that cannot change. If the tray runs through equipment, include the machine pocket or sealing-tool drawing and the intended line speed. If the tray is packed manually, include the real food portion and closed carton.
- Current product or mold code.
- Top-out, top-in, base, external height, and inner depth reference points.
- Rim style, lid code, film route, or crimp method.
- Food portion, tallest food point, and required headspace.
- Machine pocket, sealing tool, denester, or conveyor limits.
- Required count per stack, bag, carton, and pallet route.
- Which dimensions are critical and how the buyer will test them.
- Target market, drawing unit, and document revision.
If no existing mold fits the critical route, compare the stock and tooling paths in Qixin’s stock mold vs custom mold guide. A new mold should solve a defined fit problem, not merely copy a rounded catalog size.
Aluminum foil container dimensions FAQ
What is the difference between top-out and top-in dimensions?
Top-out measures the outside span of the upper rim or flange. Top-in measures the clear opening inside that rim. Top-out is often useful for lid, tool, machine, and carton fit. Top-in is closer to the food-loading opening.
Are two foil trays with the same top-out size interchangeable?
No. They may have different top-in openings, bases, depths, rim profiles, corner radii, lid systems, or nesting pitch. Compare the full drawing and run the closure, food, machine, and carton tests that matter to the route.
Is there one standard dimensional tolerance for every aluminum foil container?
The reviewed sources do not provide one universal tolerance for all tray families and measurement fields. Put agreed limits on the controlled drawing and tie them to the lid, machine, food fit, or carton consequence.
Can I calculate foil tray capacity from length, width, and height?
A simple box formula is unreliable for tapered walls, rounded corners, ribs, rims, and compartments. Use a stated volume measurement method, then test usable fill and lid clearance with the real food.
What is nesting pitch in an aluminum foil container stack?
Nesting pitch is the average height added by each additional tray in a repeatable stack. Calculate it from a counted stack: `(stack height – single-tray height) / (tray count – 1)`.
How should millimeters be converted to inches on a tray drawing?
Divide millimeters by 25.4. Keep one unit as the controlling drawing and round the second unit to honest display precision. The exact conversion factor does not create a tighter product tolerance.
How to compare two aluminum foil container drawings
- Confirm the drawing identity. Record supplier, product or mold code, revision, unit system, and matching lid code.
- Mark every reference point. Separate top-out, top-in, base, external height, inner depth, rim, corner, and divider fields.
- Rank the critical dimensions. Decide whether closure, machine, food fit, denesting, or carton risk controls the approval.
- Measure several supported samples. Use the same tools and reference points, then record the observed range.
- Measure a counted stack. Calculate nesting pitch and compare the result with denester, bag, and carton needs.
- Run the physical route. Test the final food, lid or film, equipment, stack count, and carton before signing approval.
Sources and method
The dimension terminology was checked against current product data from i2r, Plus Pack, and Pactiv Evergreen. The stacking and denesting variables were checked against JKT tray-handling guidance and the European Aluminium Foil Association’s container overview. The metric conversion uses NIST’s exact `1 inch = 25.4 mm` definition.
- i2r AS221078 product dimensions
- Plus Pack 250 ml aluminum container data
- Pactiv Evergreen two-piece aluminum container catalog
- JKT A1 tray denesting technology
- JKT tray quality and uniformity measurement note
- European Aluminium Foil Association container overview
- NIST SI units: length
The rim-projection, nesting-pitch, and stack-height equations are transparent buyer calculations. They are not container standards. Final dimensions, tolerances, lid fit, line behavior, and pack count should be confirmed on the approved drawing and production samples.
When the geometry is ready, send the drawing, current sample, lid route, and critical measurements through Qixin’s foil container quote configurator. That gives the quotation team enough information to check a stock mold before discussing custom tooling.
