Nine categories covering calibration instructions, certified weights, compliance standards, everyday weight references, and independent scale buying advice. Pick a topic below, or use the homepage's quick-start cards for the four most common ones.
How to Calibrate
Step-by-step calibration for the scale actually on your counter — the real button sequence, what weight it expects, and a coin substitute if you don't own a certified one.
Browse How to Calibrate →Scale Calibration
The general process — what calibration is, how it's different from adjustment, tolerance and standards, and calibration services and their real costs.
Browse Scale Calibration →Calibration Weights
Choose the correct weight class, material, tolerance, and set for your scale or laboratory balance, and how to store and handle them so they stay accurate.
Browse Calibration Weights →Calibration Standards
NIST Handbook 44, OIML and ASTM weight classes, ISO/IEC 17025 traceability, and legal-for-trade rules — what "compliant" actually requires.
Browse Calibration Standards →Calibration Tools
Software, chart templates, and other tools that make documenting and managing calibration easier, from a single scale to a full fleet.
Browse Calibration Tools →Scale Accuracy
How accurate a scale actually needs to be for your use case, and the tolerance requirements that separate a hobby check from a regulated one.
Browse Scale Accuracy →Scale Maintenance
Preventive maintenance, load cell replacement vs. upgrade, and the real cost of letting drift go unchecked between calibrations.
Browse Scale Maintenance →Weight References
Exact, sourced answers to "what weighs X" and the precise weight of every US coin, straight from US Mint specifications — handy as a coin-based scale check.
Browse Weight References →Best Scales
Independent buying guides and comparisons for industrial, laboratory, retail, kitchen, and personal scales.
Browse Best Scales →What You'll Find in These Guides
These scale calibration guides are built to answer one practical question at a time, not to pad out a keyword list.
What we cover right now
Step-by-step calibration instructions for the exact scale on your counter, a plain-English walkthrough of how calibration actually works, guidance on choosing the correct calibration weights, and a full breakdown of the standards — NIST Handbook 44, OIML, ASTM, ISO/IEC 17025 — that decide what "compliant" actually means. We've also built out international compliance content, including the UK's NAWI Regulations 2016, the EU's NAWI Directive 2014/31/EU, CE and M marking, and UKAS-accredited calibration, alongside independent buying advice in our Best Scales guides for choosing the right scale before you ever calibrate it.
What's coming next
We're actively expanding every one of these scale calibration guides. Next up: deeper coverage of UK average weight legislation and the three packers' rules, more scale buying guides, and continued build-out of the weight-reference library. If a guide you need isn't here yet, check back soon — this page updates as new ones go live.