Key Takeaways

A packaging weight audit is essential for accurate EPR reporting — estimates and guesswork lead to over-reporting (overpaying) or under-reporting (risking penalties).
You need two scales: a precision scale (0.1g resolution) for small items and a platform scale for larger packaging.
Sampling works: you do not need to weigh every SKU — group products by packaging type and weigh representative samples.
Weigh empty packaging, not full products — subtract product weight or weigh packaging components separately.
Document everything — your audit records form the evidence base for your EPR data submission.

Why a Packaging Weight Audit Matters

Your EPR fees are calculated based on the total tonnage of each packaging material you place on the UK market. If your weight data is inaccurate, you will either:

Over-report and pay more fees than necessary
Under-report and risk penalties and enforcement action

A systematic packaging weight audit gives you accurate data, defensible records, and the foundation for identifying cost reduction opportunities.

For background on EPR reporting, see how to report packaging data to DEFRA.

Equipment You Need

Equipment	Specification	Purpose
Precision digital scale	0.01g-0.1g resolution, 500g-2kg capacity	Small items: labels, caps, seals, films
Platform scale	1g-5g resolution, 30-60kg capacity	Boxes, pallets, large items
Sharp knife or scissors	—	Separating packaging components
Marker pen and labels	—	Identifying samples
Spreadsheet template	—	Recording data
Camera	Phone camera is fine	Documenting packaging configurations

Step-by-Step Audit Process

Step 1: Catalogue Your Packaging

Create a master list of all packaging types across your product range. Group them by:

Product category (e.g., “small electronics”, “large appliances”)
Packaging format (e.g., “corrugated box with foam insert”, “polybag only”)
Material composition (e.g., “cardboard + plastic window + polybag”)

Step 2: Select Samples

Choose representative products from each packaging group. Aim for 3-5 samples per group. Select:

Your highest-volume products (these have the most tonnage impact)
Products with typical packaging for the group
Any products with unusual or heavy packaging

Step 3: Unpack and Separate

For each sample:

Photograph the complete packaging before unpacking
Remove the product from the packaging
Separate every packaging component — box, insert, bag, label, tape, seal, cap, etc.
Group components by material — all cardboard together, all plastic together, etc.
Label each component with the product name and material type

Step 4: Weigh Each Component

Using the appropriate scale:

Zero/tare the scale before each measurement
Weigh each material group separately
Record to the nearest 0.1g for small items, 1g for larger items
Repeat for at least 3 samples from the same packaging group
Average the results to account for manufacturing variation

Step 5: Calculate Annual Tonnage

For each packaging group:

Annual tonnage = average component weight x annual sales volume

Then sum across all packaging groups for each material type.

Step 6: Allocate to Categories

Classify each component as:

Primary packaging — touches the product
Secondary packaging — groups primary packages together
Transit packaging — used for shipping/distribution

Sampling Strategy

For Small Product Ranges (under 100 SKUs)

Weigh packaging for every SKU. This is feasible and gives the most accurate data.

For Medium Product Ranges (100-1,000 SKUs)

Group SKUs by packaging type (aim for 10-20 groups)
Weigh 5 samples from each group
Average the results
Apply the group average to all SKUs in that group

For Large Product Ranges (1,000+ SKUs)

Identify your top 50-100 SKUs by volume — these likely account for 80% of your tonnage
Weigh packaging for these individually
Group the remaining SKUs into packaging types
Weigh 3-5 samples per group
Use the group average for remaining SKUs

For more on weighing methodology, see our detailed guide on how to weigh packaging for EPR.

Recording Your Data

Create a spreadsheet with the following columns:

Column	Example
Product/SKU	Widget Pro 500
Packaging Group	Medium corrugated box
Component	Outer box
Material	Corrugated cardboard
Weight (g)	350
Category	Transit
Annual Units	50,000
Annual Tonnage	17.5

Sum the “Annual Tonnage” column by material type and packaging category to get your reporting data.

Tips for Good Record-Keeping

Date your audit — record when weights were measured
Note the source — which specific product was weighed
Track changes — if packaging changes mid-year, record the old and new weights
Store photographic evidence — photos of packaging configurations support your data
Keep for at least 7 years — regulators can request evidence

Common Mistakes to Avoid

1. Forgetting Small Components

Labels, stickers, tape, and seals are individually light but add up across millions of units. Include everything.

2. Using Supplier Specs Without Verification

Packaging supplier specifications show nominal weights. Actual weights can vary by 5-15%. Verify with physical weighing.

3. Excluding Transit Packaging

Corrugated outers, pallet wrap, and strapping are easy to overlook but often represent the largest tonnage category.

4. Double-Counting Shared Packaging

If multiple products share an outer case, allocate the case weight proportionally, not to each product individually.

5. Not Updating After Packaging Changes

If you change your packaging mid-year, update your weights. Using old data for new packaging leads to inaccurate reporting.

6. Weighing Wet or Contaminated Packaging

Always weigh clean, dry, empty packaging. Moisture or product residue distorts weights.

When to Re-Audit

Conduct a full re-audit:

Annually as a minimum
When you change packaging on major product lines
When you add new product lines
When supplier changes may affect packaging weights
When regulations change reporting requirements

Getting Started

Download or create a packaging weight spreadsheet template
Gather your equipment — scales, knife, labels
Start with your highest-volume products — biggest tonnage impact
Work through your product range systematically
Use the results to complete your EPR data submission

Check our EPR compliance checklist and use the EPR fee calculator with your audit data. Visit our pricing page for compliance tools.

How to Audit Packaging Weights for EPR Compliance

Table of Contents