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Grout Volume Calculator

Calculate grout volume and cement bag requirements for borehole or annulus grouting. Includes wastage factor and common bag sizes.

Last updated 5 March 2026

About this tool

Calculate the volume of grout required for borehole abandonment or annulus grouting around casing. Includes wastage factor and converts to cement bag quantities for ordering.

Revision history

5 March 2026: Initial release with annulus/full borehole modes, wastage factor, and cement bag estimation.

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.

Grouting type

Borehole diameter (mm)

Casing OD (mm)

Depth (m)

Wastage factor (%)

Typical: 15-25% to account for losses and overbreak.

Cement bag size (kg)

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