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Ten Percent Fines Value Calculator

Calculate TFV from applied force and percent fines per BS 812-111. Includes aggregate strength classification for road construction suitability.

Last updated 28 July 2026

About this tool

Calculate the Ten Percent Fines Value from applied force and percentage of fines produced per BS 812-111. Results are classified against typical suitability thresholds for road base, sub-base, and wearing course applications.

How to use this tool

Enter applied force (kN) and percent fines produced — mass passing 2.36mm as % of original specimen.

Technical information

TFV = 14 × F / (m + 4)

Where F = applied force (kN), m = % fines. Per BS 812-111.

Limitations

Classification thresholds are typical values. Project-specific requirements may differ. BS 812-111 has been superseded by BS EN 1097-2 but TFV remains widely used in UK practice.

Revision history

28 July 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.

Applied force (kN)

Percent fines produced (%)

Mass passing 2.36mm sieve as % of original test specimen

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