Down-Gauging Savings Calculator
See the annual cost and CO&sub2; saving from a thinner film gauge — from current and target thickness, annual usage and film price.
Inputs
Result
Assumes the same pack area and material density, so saving scales with the thickness ratio. Always validate seal, puncture and barrier performance at the thinner gauge before switching. See the Knowledge Base.
How to use itQuantify a down-gauge in one screen
- Enter the current and target thickness in microns — the gauge you run today and the thinner gauge you are considering.
- Enter your annual film usage at the current gauge, in tonnes, plus the film price per kg.
- Add a carbon factor for the material (kg CO&sub2;e per kg of film). The tool returns the tonnes and cost saved per year, the CO&sub2;e avoided, and a risk flag for how aggressive the down-gauge is.
Why it mattersWhy down-gauging is the biggest material lever
For most flexible and thermoform packs, film is the single largest material cost and the largest share of the pack's carbon footprint. Because a solid film's weight scales directly with its thickness, taking even a few microns out of the gauge cuts both cost and CO&sub2; proportionally, across every pack you make, for the life of the specification. A 10% down-gauge on a hundred tonnes of film a year is ten tonnes of plastic and its embedded carbon removed annually — which is why down-gauging, done within spec, is usually the first move in both a cost-out and a sustainability programme.
The mathsThe formulas
Film saved per year = annual usage × down-gauge
Cost saving = film saved (kg) × price per kg
CO&sub2;e avoided = film saved (kg) × carbon factor
For a monolayer or evenly gauged film at constant density, weight per unit area is proportional to thickness, so reducing the gauge from 50 to 45 µm removes 10% of the weight for the same pack area. The saving therefore tracks the thickness ratio directly. The model assumes the same pack area and material — if the down-gauge comes with a resin change, adjust the price and carbon factor to the new material.
ReferenceTypical carbon factors by film
| Material | Approx. kg CO&sub2;e per kg |
|---|---|
| Virgin PE (LDPE/LLDPE) | ~2.0 |
| Virgin PP | ~2.0 |
| Virgin PET | ~2.7 |
| Recycled PET (rPET) | ~1.2 |
| Aluminium foil | ~9–18 |
Before you switchWhat limits the down-gauge
Thinner film has less to give: seal strength, puncture and tear resistance, stiffness for machinability, and barrier all fall as the gauge drops. A safe down-gauge holds all of these within the pack's real requirements — often by pairing a modest thickness cut with a stronger resin, an orientation change or a better structure. Treat anything beyond about 15% as needing validation trials, and confirm seals with the seal force calculator. See the material and sustainability guides in the Knowledge Base.
FAQFrequently asked questions
How much does down-gauging film save?
The saving tracks the thickness reduction: because film weight is proportional to gauge, cutting thickness by 10% removes about 10% of the material weight, cost and carbon for the same pack area. On large volumes this compounds into tonnes and significant spend every year.
What is down-gauging in packaging?
Down-gauging means specifying a thinner film or sheet that still meets the pack's requirements — reducing the gauge in microns to use less material per pack. It is one of the most direct ways to cut both material cost and packaging carbon footprint.
How thin can I down-gauge safely?
It depends on the pack's demands on seal strength, puncture resistance, stiffness and barrier. Modest reductions up to around 15% are often achievable within spec; larger cuts usually need a stronger resin, orientation or structure change and should be proven with validation trials.
Does down-gauging reduce carbon footprint?
Yes. Less film means less material produced, so the embedded carbon falls in proportion to the weight removed. Multiplying the tonnes of film saved by the material's carbon factor gives the CO&sub2;e avoided each year.
What carbon factor should I use for film?
As a rough guide, virgin PE and PP are around 2.0 kg CO&sub2;e per kg, virgin PET around 2.7, and recycled PET closer to 1.2. Aluminium foil is far higher. Use a supplier-specific or EPD figure where you have one for an accurate result.