The short version
- You pay for sheet area, not tray area. The cost driver is the sheet the tray consumes — its own footprint plus the trim web around it — divided by cavities per cycle.
- Grams decide the material line. Area consumed × gauge in microns × material density = grams per part. Everything else is arithmetic on that.
- Depth drives gauge, and gauge drives cost. A deeper tray needs heavier sheet to keep the thinnest corner legal, and a longer cycle to heat and cool it.
- Run length spreads setup. Setup is a fixed block of machine hours. On a small order it dominates; past a point it stops mattering.
- Tooling is quoted separately and charged once. It never belongs inside the piece price.
What actually makes up the price of a thermoformed tray?
Five things: the sheet the part consumes, the machine time it occupies, the secondary operations it needs, the share of setup it carries, and the value recovered from trim. Everything a converter quotes is one of those five plus margin.
None of it is mysterious, and none of it depends on your negotiating skill. A tray is a piece of sheet that spent a certain number of seconds on a forming station and a certain number of seconds under a punching press. If you know those quantities, you can price it yourself to within a few per cent, and more usefully, you can see which lever actually moves the number.
| Cost line | What it depends on | Who controls it |
|---|---|---|
| Sheet material | Sheet area consumed per part × gauge × density × sheet rate | Mostly the designer — footprint, depth and nesting |
| Forming time | Cycle seconds ÷ cavities per cycle, at the machine hour rate | Shared — gauge and depth set the cycle, layout sets cavities |
| Trimming and punching | Press strokes per sheet, die complexity, part count per stroke | The converter, given the part outline |
| Secondary operations | Folding, hole punching, sub-assembly, poly bagging, interleaving | The pack specification |
| Setup share | Fixed setup hours ÷ order quantity | The buyer, through order size and release pattern |
| Trim recovery | Web percentage and what regrind is worth against virgin sheet | Shared — nesting sets the web, material sets its value |
| Packing and freight | Nest height, cartons per pallet, distance, whether it ships nested | Mostly the designer — a tray that nests tightly ships cheaply |
Current input rates — sheet rate per kilogram by material, machine hour rate, punching press rate and regrind recovery value: CONFIRM — the four numbers that turn every formula on this page into rupees, to be signed off before publication and reviewed each quarter.
How do you calculate the sheet cost of a single tray?
Sheet area consumed per part × gauge × material density = grams per part. Multiply grams by the sheet rate and you have the material cost. The trap is the first term: the area consumed is the sheet area divided by cavities per cycle, not the area of the finished tray.
Work a real one. A tray with a 150 × 100 mm footprint. We form on a 600 × 600 mm envelope. The cavities need roughly 10 mm of web between them for the punching die to have something to hold, so the pitch is 160 × 110 mm. Three fit across 600 mm, five fit down it. That is 15 cavities per cycle.
Sheet consumed per part = 600 × 600 ÷ 15 = 24,000 mm², or 240 cm². At 300 micron — that is 0.03 cm — the volume is 7.2 cm³. A-PET has a density of about 1.34 g/cm³, so the tray consumes 9.6 g of sheet.
The finished tray does not weigh 9.6 g. Punched out at a 155 × 105 mm flange it holds about 6.5 g, and the remaining 3.1 g is skeletal web. But you bought all 9.6 g. The web is a real cost that comes back partially, not a cost that disappears.
That single calculation explains most price differences between quotations for the same drawing. Two converters with the same sheet rate can be twenty per cent apart purely because one of them laid out 15 cavities and the other laid out 12.
Why does the gauge in microns matter so much?
Gauge is a straight multiplier on the material line — 500 micron costs exactly 67 per cent more in sheet than 300 micron for the same layout. And gauge is not a free choice: the draw depth decides the minimum gauge you can get away with.
When a sheet is drawn into a cavity, the material that reaches the deepest corners has stretched the furthest, so that is where the wall ends up thinnest. As a working approximation, average finished wall is starting gauge divided by the areal draw ratio, and the thinnest corner is often around half the average again. A 20 mm deep tray at 300 micron might hold 180 micron in the corner. The same footprint at 60 mm deep, still at 300 micron, could drop below 100 micron and buckle in the hand.
So you do not choose gauge, the geometry chooses it, and then you pay for it. This is why "just make it thinner" is usually the wrong first request. The right first request is "can the shape be changed so it needs less gauge" — softer corners, generous radii, a stepped wall instead of a straight deep one. The rules are set out in designing for thermoforming.
We form 200 to 2000 micron. Retail blisters and light inserts sit at the bottom of that band, medical device trays and industrial dunnage at the top.
How much does forming and trimming time add?
Machine time is charged per hour and divided by the parts that hour produced. So the number that matters is parts per hour, which is cavities per cycle divided by cycle seconds — and cycle seconds rise steeply with gauge.
A forming cycle is mostly heating and cooling. Thick sheet takes longer to bring to forming temperature and longer to set against the tool before it can be released without distorting. Indicatively, thin gauge cycles in the twenty-second region and heavy gauge can take two to three times that. Plant-specific cycle times by material and gauge: CONFIRM — a short table of typical cycle seconds for 300, 500, 800 and 1200 micron, from actual production records.
Take the 15-cavity example at a 25-second cycle. That is 144 cycles an hour, or 2,160 trays an hour. Now take the same footprint at 60 mm deep in 500 micron, where the cycle stretches to 40 seconds: 90 cycles an hour, 1,350 trays an hour. The machine cost per tray has risen 60 per cent without a single dimension of the outline changing.
Trimming is separate. Most of our work is punched on a press after forming, and a punching die that takes the whole sheet in one stroke is far cheaper per part than one that takes a row at a time. Folding blisters add a folding operation after punching. Each extra handling step is a real, quantifiable line — not an excuse to inflate the rate.
Why do two trays of the same size differ so much in price?
Because footprint is the least important of the variables. Depth sets gauge, gauge sets grams and cycle time, and those two lines together are usually 70 to 80 per cent of the cost of a tray.
Here are the same 150 × 100 mm outline formed two ways. Tray A is a shallow presentation insert. Tray B is a deep protective tray for the same product. Nothing about the outline changed.
| Variable | Tray A — shallow insert | Tray B — deep tray | Effect |
|---|---|---|---|
| Footprint | 150 × 100 mm | 150 × 100 mm | Identical |
| Draw depth | 20 mm | 60 mm | 3× the draw |
| Gauge required | 300 micron A-PET | 500 micron A-PET | Set by corner thinning, not by choice |
| Cavities per cycle | 15 | 15 | Same layout |
| Sheet consumed | 240 cm² · 9.6 g | 240 cm² · 16.1 g | +67% material |
| Cycle time | ~25 s | ~40 s | +60% machine time |
| Output per hour | ~2,160 pcs | ~1,350 pcs | −38% throughput |
| Trim web | ~32% of sheet | ~32% of sheet | Unchanged — same layout |
| Relative piece price | Index 100 | Index 165 to 175 | Same outline, two-thirds more expensive |
The index at the bottom is the honest answer to "why is your price higher than the tray I bought last year". It probably was not the same tray. It was the same outline with a different depth, and depth is the expensive dimension.
How does run length change the price?
Setup is a fixed block of machine hours — mould change, heater profiling, first-article approval, punching die set-up — and it is spread across whatever quantity you order. On a small order it can equal the running time. Past a certain size it stops mattering entirely.
Using Tray A at 2,160 pieces an hour, and calling setup 2.5 machine hours:
| Order quantity | Running hours | Setup hours | Setup as % of machine time | Machine cost index per piece |
|---|---|---|---|---|
| 2,000 pcs | 0.9 | 2.5 | 73% | 370 |
| 5,000 pcs | 2.3 | 2.5 | 52% | 208 |
| 10,000 pcs | 4.6 | 2.5 | 35% | 154 |
| 25,000 pcs | 11.6 | 2.5 | 18% | 122 |
| 50,000 pcs | 23.1 | 2.5 | 10% | 111 |
| 100,000 pcs | 46.3 | 2.5 | 5% | 105 |
| 500,000 pcs | 231.5 | 2.5 | 1% | 101 |
Read the last column carefully, because it is the opposite of what most buyers assume. Almost the entire benefit of scale is captured by 50,000 pieces. Going from 50,000 to 500,000 improves the machine line by ten per cent — and the machine line is not the biggest line. Material per piece barely moves at all with quantity, because sheet is sheet.
The practical conclusion: the price break you are chasing usually lives between 5,000 and 50,000 pieces, not between one lakh and ten lakh. If you need 60,000 trays a year, quoting it as two releases of 30,000 gets you most of the available saving. Quoting it as twelve releases of 5,000 pays for twelve setups. We hold stock against schedules for regular customers precisely so the run length and the delivery pattern can be different decisions.
Want the same working shown on your part?
Send a drawing or a photo with dimensions. We will come back with cavities per sheet, grams per piece, the gauge the depth actually needs, and a price with the arithmetic visible. Tooling quoted separately, as it should be.
Do I pay for the scrap between the cavities?
You pay for it as sheet and get part of it back as regrind. The web is typically 25 to 40 per cent of the sheet on a rectangular tray, and its recovery value is well below the price of the sheet it came from — so it is a real cost, just not a total loss.
Three things decide the web percentage. Cavity pitch: the gap needed between cavities for a punching die to work. Part shape: rectangles nest almost perfectly, circles and irregular outlines waste the corners between them. Sheet width against part width: an awkward combination leaves a strip down one side of every sheet that does nothing.
Regrind is not free money either. The web is collected, granulated and fed back, but material that has been through a heat history behaves slightly differently and there is a practical ceiling on how much can go back into a food-facing or optically critical part. It has a value; it does not have the value of the sheet.
How do I actually bring the piece price down?
Four levers, in descending order of effect: improve the nesting, reduce the gauge the geometry allows, lengthen the run, and swap the material. The first is nearly always the biggest and nearly always the one nobody tries.
- Nest better. Move a footprint dimension by a few millimetres to gain a whole row or column of cavities. Step change, not gradual. Ask before the design is frozen.
- Reduce gauge where the part allows. Not by wishing — by softening corner radii, adding draft, breaking one deep wall into two shallow steps, or adding a stiffening rib so a thinner wall still feels rigid. Rigidity in the hand comes from geometry as much as from thickness.
- Consolidate the run. Fewer, larger releases against a schedule. Most of the gain is below 50,000 pieces.
- Swap the material. HIPS has a density near 1.05 against A-PET at about 1.34, so at the same gauge a HIPS tray contains roughly 22 per cent fewer grams. If the tray does not have to be clear, that is a substantial saving before you even look at sheet rates. rPET sits below virgin A-PET and is what we run as standard anyway. The trade-offs are in A-PET vs rPET vs PVC vs HIPS.
- Drop an operation. Does the tray need a folded flap, a euro hole, individual bagging? Each is a handling step. Some are essential and some are inherited from a pack designed five years ago.
What does not work: pushing the rate without changing anything physical. If the tray consumes 16 g of sheet and 2.7 seconds of machine time, no supplier can price it as though it consumes 9 g. Someone quoting as though it does is planning to under-gauge it, and you will find out on the packing line.
Is the mould cost part of the piece price?
No. Tooling is quoted separately and charged once. We make aluminium production moulds in-house and keep them for repeat orders, so a second order for the same tray carries no tooling line at all.
Some converters amortise tooling into the piece price to make a first quotation look sharp. It creates two problems. You cannot compare that quotation with an honest one, and when you reorder you are still paying an amortisation that finished long ago. Ask any supplier to separate the two lines. If they will not, that is information.
Our normal sequence is a wooden trial mould first, so the shape can be proved and sampled with your actual product sitting in it before aluminium is committed. What sets the tooling number — footprint, cavity count, draw depth, complexity — is covered in how much a thermoforming mould costs in India.
What should a proper tray quotation show?
Material and gauge, cavities per sheet, grams per piece, the piece price, tooling as a separate line, the quantity the price is based on, and the validity period. If a quotation has one number on it, it is not a quotation, it is a guess with a letterhead.
What we put on ours:
- Material and gauge — for example 500 micron rPET, so you can check it against the depth.
- Cavities per sheet and web percentage — the evidence that your part has been laid out, not estimated.
- Grams per piece — which lets you sanity-check the material line yourself, and which you will need for EPR reporting.
- Quantity basis — the price applies to a stated order size; a different size is a different price.
- Tooling, separately — trial mould and production mould, one time.
- Lead time and dispatch basis — we dispatch pan-India and supply NSEZ export houses.
Sheet rates move with polymer prices, so any piece price is valid for a stated window. That is not a hedge, it is how the input market works. What does not move is the physics: the grams, the cavities and the seconds. Those are the numbers to argue about.
Frequently asked questions
Why do two trays of the same size cost different amounts?
Because footprint is only one of five variables. The deeper tray needs a heavier starting gauge to keep the thinnest corner above minimum wall, so it eats more grams of sheet. It also needs a longer heating and cooling cycle, so fewer parts come off the machine each hour. Two trays with the same outline can differ by 60 to 80 per cent on material and machine time alone, before you look at run length or secondary operations.
How is the material cost of a thermoformed tray calculated?
Sheet area consumed per part times gauge times material density gives grams per part, and grams times the sheet rate gives the material cost. The area consumed is the sheet area divided by the number of cavities formed in one cycle — not the area of the finished tray. That distinction is the single most misunderstood part of tray costing, because the trim web between cavities is bought and paid for even though it never leaves the factory as product.
Does a longer production run really reduce the price per tray?
Yes, sharply at first and then hardly at all. Setup — mould change, heater profiling, first-article approval, punching die set-up — is a fixed block of machine hours regardless of order size. On a 5,000 piece order it can be comparable to the running time itself. By 100,000 pieces it is a rounding error. Most of the saving is captured well before the run gets very long, which is why quoting a year's requirement in two or three releases usually beats twelve monthly ones.
Is the mould cost included in the price per piece?
No. We quote tooling separately and charge it once. Aluminium production moulds are made in-house and remain available for repeat orders, so the second order carries no tooling line at all. Some converters bury tooling in the piece price to make the first quotation look competitive; that hides the real cost of a repeat order and makes any comparison between suppliers meaningless.
What is the fastest way to reduce the price of a thermoformed tray?
Change the footprint so more cavities fit on the sheet. A few millimetres off one dimension can lift the cavity count by a whole row or column, and that is a step change in material per part rather than a gradual one. Send the drawing before the design is frozen and we will tell you what dimension to move and how much it saves. After that, in order: reduce gauge where the draw allows it, run longer batches, and consider a material swap.