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Cover Meter Processor

Free online covermeter results processor. Analyses cover readings against BS EN 1992-1-1 Eurocode 2 requirements with statistical summary.

Last updated 17 March 2026

About this tool

Analyse electromagnetic cover meter survey data against specified nominal cover and code minimum requirements from BS EN 1992-1-1 (Eurocode 2).

Paste your comma-separated cover readings and the tool calculates statistics, flags deficiencies against both specified and code minimum cover, and gives an overall pass/marginal/fail assessment.

How to use this tool

Enter cover readings — comma-separated values in mm from your electromagnetic cover meter survey.
Enter specified nominal cover — the design cover shown on the structural drawings (cnom).
Select exposure class — the relevant Eurocode 2 exposure class. This sets the code minimum cover (cmin,dur) for Structural Class S4.
Review results — the tool shows statistics, percentage of readings below specified and code minimum cover, and an overall assessment.

Technical information

Minimum cover values (cmin,dur) are taken from BS EN 1992-1-1 Table 4.4N for Structural Class S4 (the recommended default for a 50-year design life):

XC1: 15 mm
XC2/XC3: 25 mm
XC4: 30 mm
XD1/XS1: 35 mm
XD2/XS2: 40 mm
XD3/XS3: 45 mm

Assessment criteria

FAIL — any reading below the code minimum cover.
MARGINAL — more than 5% of readings below specified nominal cover.
PASS — all readings meet or exceed code minimum and ≤95% meet specified cover.

Revision history

17 March 2026: Initial release

Disclaimer

This tool is provided for educational and general information purposes only. It is not a substitute for professional engineering advice, design or verification.

Diggy and its contributors are not licensed engineering consultants and no results generated by this tool should be used directly for construction, design or safety-critical decisions.

All values and outputs are based on published empirical correlations and should be independently checked and confirmed by a qualified geotechnical engineer before use.

By using this tool, you accept full responsibility for how you interpret and apply the information provided.

Spotted an error? Let us know.

Cover readings (mm)

Enter comma-separated cover readings in mm

Specified nominal cover (mm)

Exposure class