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Tolerable negative error (TNE) calculator

Calculate the UK tolerable negative error and twice-TNE threshold for eligible packaged goods sold by weight or volume.

Production environment relevant to tolerable negative error (tne) calculator

What this calculator does

Enter the nominal quantity in grams or millilitres. The tool applies the current GOV.UK TNE band, rounds percentage-based values up to the nearest 0.1 g or ml, and shows both TNE and twice TNE. It is a planning aid, not a complete legal compliance assessment.

Your result

Enter the production figures and select Calculate result.

Checks before using the result

  • Confirm the product is within the packaged-goods rules being applied
  • Use the declared nominal quantity in grams or millilitres
  • Confirm the correct current TNE band
  • Round percentage results up to the nearest 0.1 g or ml
  • Assess the batch average as well as individual packs
  • Validate the measuring and checkweighing system
  • Keep evidence of sampling and corrective action
Relevant specialist route

Weigh Fillers

Weigh-filling routes for repeatable quantities and controlled product giveaway.

View the solutionweighfillers.co.uk
Planning estimate: Validate every input against the real product, pack, line and applicable procedures before using the result for a purchase, compliance or capacity decision.

Official references

Check the current source before relying on dates, thresholds or legal duties.

Calculator questions

Questions customers also ask

Is TNE the amount every pack may be short?

No. It is one threshold within the Three Packers Rules; the batch average and the number of packs below TNE are also controlled.

How are percentage TNE values rounded?

Current GOV.UK guidance says the calculated weight or volume is rounded up to the nearest 0.1 g or ml.

Does the calculator set my checkweigher reject point?

No. Reject settings must also account for dynamic weighing performance, measurement uncertainty and the site quantity-control plan.

Can I use this for any pack size?

The displayed official bands cover nominal quantities from 5 g or ml upward. Confirm the scope and current law for the actual product and market.

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