# How to reduce giveaway on the packing line | ACSS

> What UK weights and measures law actually requires when you pack fish and seafood, and practical ways to cut the free fish you give away without risking a short-weight breach.

Source: https://acss.co.uk/blog/reduce-giveaway-fish-packing-line

ACSS Blog — 29 September 2026

# How to reduce giveaway on the packing line

What UK weights and measures law actually requires when you pack fish and seafood, and practical ways to cut the free fish you give away without risking a short-weight breach.

![Andreas Kater](/images/authors/andreas-kater.jpg)

**Andreas Kater**CEO, ACSS

7 min read

**The short answer:** giveaway is the extra weight you pack into a box or pack beyond what you're charging for, added because nobody wants to be caught underweight. Most of it comes from habit rather than law: staff round up "to be safe" on every pack instead of on the few that need it. You cut it by using accurate, verified scales, knowing which of the two UK weight rules actually applies to what you're packing, setting targets close to the legal minimum instead of comfortably above it, and watching real pack weights over time so drift gets caught early.

That's the summary. Here's what the law actually says, and where the room to cut giveaway really is.

![Weight limits for a 500 g pre-packed pack on a scale from 460 g to 520 g: under 470 g is never allowed, 470 to 485 g is allowed for only a small proportion of packs, 485 to 500 g is allowed if the batch averages at least 500 g, and anything over 500 g is giveaway](/images/blog/reduce-giveaway-fish-packing-line.svg)

## What "giveaway" actually means

Giveaway is simple: if you sell a box as 5 kg and it goes out at 5.15 kg, that 150 g cost you the same as the rest of the box, but nobody paid for it. On its own it looks trivial. Multiplied across every box, every day, all year, it's real money, and it's the easiest kind of loss to fix because you already own the fish — you're just giving some of it away for free.

Processors add it deliberately, for a good reason: nobody wants to fall foul of weights and measures law, and it's much easier to add a safety margin to every pack than to trust the process. The question worth asking is whether that margin is bigger than the law actually requires.

## Which weight rule applies to what you pack

There are two different rules, and which one applies changes how much margin you actually need.

**Fish weighed to a specific customer order** — a box priced per kilo, weighed at despatch to whatever weight it comes out at — is covered by the general short-weight rule in the Weights and Measures Act 1985. Section 28 makes it an offence to deliver less than what you're selling, or less than what corresponds to the price charged. There's no averaging here: every single delivery has to be at or above what the customer is paying for, because each one is checked on its own.

**Fish packed in advance to a fixed, stated weight** — pre-weighed retail packs marked "500 g", for example, packed in batches before any customer is involved — falls under the Weights and Measures (Packaged Goods) Regulations 2006 instead. This is the "average quantity system", and it works differently: it's checked across a whole batch, not pack by pack.

## What the average quantity system actually allows

For pre-packed, fixed-weight batches, the packer has to satisfy three rules, set out in regulation 4 of the 2006 Regulations:

1.  The **average** contents of the batch must be at or above the nominal (stated) weight.
2.  Only a small proportion of packs may fall short of the nominal weight by more than the **tolerable negative error (TNE)** for that pack size.
3.  No pack may ever be short by more than **twice** the TNE.

The TNE itself is set out in Schedule 3, as a percentage or a fixed amount depending on pack size:

Nominal quantity

Tolerable negative error

5 g – 50 g

9%

50 g – 100 g

4.5 g

100 g – 200 g

4.5%

200 g – 300 g

9 g

300 g – 500 g

3%

500 g – 1,000 g

15 g

1,000 g – 10,000 g

1.5%

10,000 g – 15,000 g

150 g

above 15,000 g

1%

So a batch of 500 g packs can have some packs down to 485 g (15 g TNE), as long as no pack is below 470 g (twice the TNE) and the batch as a whole averages 500 g or more. That's the point most processors miss: the law doesn't require every pack to be at or above nominal weight. It requires the batch average to be at or above nominal, with only a small, defined proportion allowed under it. Packing every single pack a few grams over "to be safe" is doing more than the regulation asks for — often a lot more, repeated thousands of times a week.

Trading standards enforce both regimes, and they check batches using a reference test procedure set out in Schedule 2 of the 2006 Regulations: a sample is checked against the minimum acceptable weight (nominal minus TNE) and against the batch average, with different sample sizes depending on batch size.

## Where the real savings are

None of this means chase the legal minimum and hope. It means:

-   **Know which rule applies to each product line.** Boxes weighed to order at despatch need a different mindset (never short, every time) from fixed-weight retail packs (managed as a batch average).
-   **Use verified scales, and keep them verified.** Equipment used to weigh goods for sale has to be passed as fit for use for trade — stamped or marked as verified — and re-verified if it's repaired or adjusted. An inaccurate scale is the single biggest cause of unnecessary giveaway: if you don't trust the reading, you compensate by adding weight, on every pack, all day.
-   **Set the target close to the rule, not to your nerves.** If your process is genuinely accurate and consistent, the target can sit much closer to nominal than most factories run at.
-   **Track actual pack weights, not just the target.** You can't tell whether you're giving away 2% or 8% without measuring it. A packing station that records the real weight of every box, rather than the weight someone typed in from memory, turns giveaway from a guess into a number you can act on.
-   **Fix variability before you fix the target.** If portion sizes vary a lot — different cutters, different fish sizes, inconsistent icing — the target has to sit higher just to stay safe. Reducing that variability lets you lower the target and keep the same margin of safety.

## Common ways giveaway creeps in unnoticed

-   Scales that haven't been re-verified after a repair or a house move.
-   A "just in case" habit that outlives the reason it started — someone was caught short once, and the whole line has packed heavy ever since.
-   No visibility of actual pack weights over time, so a slow drift upward is never spotted.
-   Packing stations shared between product lines without the tare being reset properly for each one.
-   Staff packing by eye for speed on a busy day, rather than to the scale.

## Where Aquarius helps

Aquarius's packing stations weigh and label each box as it's packed, and the actual weight is captured against the record rather than typed in afterwards. That gives you a real history of what left the factory, box by box, so you can see whether your packs are sitting on target or drifting, instead of relying on what people remember. It's one part of the wider [packing system](/packing-systems-fish-seafood) alongside labelling and despatch — see the [Aquarius system](/aquarius-system) for how it all fits together. If you're currently working from a target weight nobody's actually checking, [we're happy to show you what that looks like](/contact).

## Quick answers

**Is giving away weight illegal?** No — giveaway itself isn't an offence. What's illegal is delivering less than what's charged for (section 28, Weights and Measures Act 1985) or, for pre-packed batches, failing the average quantity system's three rules. Giveaway is what happens when you overcorrect against those rules.

**Can I legally send out an underweight pack?** Only under the average quantity system, and only within limits: a pack can be short by up to the tolerable negative error for its size, provided not too many packs in the batch are short and the batch average is still at or above the nominal weight. A box weighed to a specific customer's order has no such allowance — it must be at or above what they're being charged for, every time.

**Do my scales need to be legally verified?** Yes, if they're used to determine what a customer pays or what's on a label. Equipment used for trade must be verified (stamped or marked) and re-verified after repair or adjustment.

**Does this apply to fish sold loose at a counter, weighed while the customer waits?** Yes, the same section 28 short-weight rule applies: the customer must not receive less than they're paying for.

**How do I know how much giveaway I'm actually carrying?** You need real weight data per pack, not the target weight. Comparing actual recorded weights against the nominal weight over a few days' production will usually show more variation, and more margin, than expected.

## Sources

-   [The Weights and Measures (Packaged Goods) Regulations 2006](https://www.legislation.gov.uk/uksi/2006/659/contents/made) (legislation.gov.uk), specifically [regulation 4](https://www.legislation.gov.uk/uksi/2006/659/regulation/4/made) (the three packers' rules), [Schedule 2](https://www.legislation.gov.uk/uksi/2006/659/schedule/2/made) (the reference test) and [Schedule 3](https://www.legislation.gov.uk/uksi/2006/659/schedule/3/made) (tolerable negative error)
-   [Weights and Measures Act 1985, section 28: short weight, etc.](https://www.legislation.gov.uk/ukpga/1985/72/section/28) (legislation.gov.uk)
-   [Packaged goods: weights and measures regulations](https://www.gov.uk/guidance/packaged-goods-weights-and-measures-regulations) (GOV.UK)
-   [Weights and measures: business guidance](https://www.gov.uk/guidance/weights-and-measures-business-guidance) (GOV.UK) — verification of weighing equipment for use for trade

_This is a practical summary, not legal advice. If you're unsure how these rules apply to a specific product line, check with your local trading standards service._

![Andreas Kater](/images/authors/andreas-kater.jpg)

Written by

## Andreas Kater

Andi founded Wakeflow, the software company that acquired ACSS in 2026 and now develops the Aquarius system. He has a background in management consulting and software development, and holds an MBA from INSEAD.

Questions about this, or want to see how Aquarius handles it? Get in touch.

[Book a 30-minute call](https://orbio.one/book/andreas-kater/30min)[WhatsApp me](https://wa.me/447500172268?text=Hi%20Andi%2C%20I%20just%20read%20%22How%20to%20reduce%20giveaway%20on%20the%20packing%20line%22%20on%20acss.co.uk%20and%20had%20a%20question%3A)[andi@acss.co.uk](mailto:andi@acss.co.uk)

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## Contact us for more details, questions or additional information

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