# Filling Machine Accuracy Explained | AXTRA > What filling machine accuracy percentages actually mean for your production line, why they matter, and how to match accuracy to your product. - Source page: https://www.axtra.com/filling-machine-accuracy-explained/ - Language: English (en) - Last updated: 2026-09-23 - Publisher: AXTRA S.r.l. - https://www.axtra.com/ - Other languages: [de](https://www.axtra.com/de/fuellgenauigkeit-erklaert-was-%c2%b105-fuer-ihre-linie-wirklich-bedeuten.md), [es](https://www.axtra.com/es/precision-de-llenado-explicada-que-significa-realmente-05-para-tu-linea.md), [fr](https://www.axtra.com/fr/precision-de-remplissage-ce-que-%c2%b105-signifie-reellement-pour-votre-ligne.md), [it](https://www.axtra.com/it/precisione-di-riempimento-cosa-significa-davvero-05-per-la-tua-linea.md), [pt-br](https://www.axtra.com/pt-br/precisao-de-enchimento-explicada-o-que-%c2%b105-significa-realmente-para-a-sua-linha.md), [ru](https://www.axtra.com/ru/%d1%82%d0%be%d1%87%d0%bd%d0%be%d1%81%d1%82%d1%8c-%d1%80%d0%be%d0%b7%d0%bb%d0%b8%d0%b2%d0%b0-%d1%87%d1%82%d0%be-%d0%bd%d0%b0-%d0%bf%d1%80%d0%b0%d0%ba%d1%82%d0%b8%d0%ba%d0%b5-%d0%be%d0%b7%d0%bd%d0%b0.md) --- ## Filling Accuracy Explained: What +/-0.5% Really Means for Your Line Filling machine accuracy is usually expressed as a small percentage — ±0.5%, ±1%, ±2% — and it’s easy to skim past those numbers without realising how much they actually affect a production line. This article explains what filling accuracy really means in practice, why the difference between ±0.5% and ±2% matters more than it looks, and how to think about accuracy when evaluating a [filling machine](https://www.axtra.com/tag/filling-machines/). ## What the Percentage Actually Means A filler rated at ±0.5% accuracy on a 750ml bottle will vary by roughly ±3.75ml around the target fill volume. At ±2% accuracy, that same bottle could vary by ±15ml — four times the deviation. On an individual bottle, that difference may be invisible. Multiplied across tens of thousands of units, it becomes a measurable amount of product either given away for free (overfill) or a compliance risk (underfill). ## Why Accuracy Varies by Technology Gravity fillers, which rely on the product’s own weight, typically run around ±1-2% accuracy — perfectly adequate for many applications, but not a technology chosen specifically for tight tolerance. [Volumetric and piston fillers](https://www.axtra.com/how-to-choose-a-filling-machine/) use active metering rather than passive flow, which is why they can reach ±0.5-1% consistently across a wider range of products. Net-weight fillers, which measure each container on a scale rather than estimating volume, offer the tightest control of all, at the cost of speed and equipment complexity — usually reserved for high-value or heavily regulated products where every gram matters. ## The Real Cost of Poor Accuracy Overfilling is the quieter cost, because it never triggers a complaint or a regulatory flag — it simply erodes margin, bottle after bottle, in a way that’s easy to miss on a spreadsheet until someone calculates it directly. Underfilling is the louder cost: it risks non-compliance with net-content regulations and, if noticed by customers, damages trust in a way that’s disproportionate to the small volume involved. Neither cost shows up as a single dramatic event — both accumulate quietly, which is exactly why accuracy specifications deserve real scrutiny before a machine is purchased, not just a passing mention in a sales conversation. ## Matching Accuracy to the Product Not every product needs ±0.5% accuracy — a lower-cost, lower-margin product filled at high volume may tolerate ±1-2% without meaningful financial impact, while a high-value or regulated product cannot. The right question isn’t “what’s the most accurate filler available” but “what accuracy does this specific product and market actually require,” since over-specifying accuracy usually means paying for filling technology, speed and complexity the line doesn’t need. ## Getting Accuracy Right on Your Line Filling accuracy should be evaluated together with the product’s viscosity and required production speed, not treated as an isolated specification. AXTRA configures [filling machines](https://www.axtra.com/liquid-filling-machines-guide/) to the accuracy a specific product and market actually require, avoiding both under- and over-engineering. [Contact AXTRA](https://www.axtra.com/contacts/) to review the right filling accuracy for your line. For background on how net content and fill accuracy are regulated, see [Wikipedia’s entry on packaging and labeling](https://en.wikipedia.org/wiki/Packaging_and_labeling). October 2, 2026 ### [Filling Accuracy Explained: What +/-0.5% Really Means for Your Line](https://www.axtra.com/filling-machine-accuracy-explained/) Filling machine accuracy is usually expressed as a small percentage — ±0.5%, ±1%, ±2% — and it’s easy to skim past those numbers without realising Read more » ### [How to Choose a Filling Machine: Volumetric, Gravity and Piston Compared](https://www.axtra.com/how-to-choose-a-filling-machine/) Knowing how to choose a filling machine starts with a question most buyers skip past too quickly: what, exactly, does the product do when it [nextHow to Choose a Filling Machine: Volumetric, Gravity and Piston Compared](https://www.axtra.com/how-to-choose-a-filling-machine/) #### Contact us ## From empty container to finished product. --- Markdown version generated by LABOOM SEO/GEO Manager for AI agents. The HTML page above is the authoritative source.