ToolsField Drilling ToolsDrilling Calculations

Borehole Volume Calculator

Calculate borehole volume from diameter and depth. Essential for grout quantity estimation, casing requirements, and drilling fluid calculations.

Last updated 5 March 2026

About this tool

Calculate the volume of a borehole from its diameter (or radius) and depth. Useful for estimating grout quantities, drilling fluid requirements, and planning casing installations.

Revision history

5 March 2026: Initial release with diameter/radius input modes, metric and imperial volume outputs.

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.

Input type

Diameter (mm)

Common sizes: HQ = 96mm, NQ = 75.7mm, PQ = 122.6mm

Depth (m)

Related tools

Casing Volume CalculatorCalculate casing material volume and internal capacity from outer and inner diameters. Essential for ordering materials and grout planning.Cement-Bentonite Grout Mix DesignerDesign cement-bentonite grout mixes to specification. Calculate batch quantities of cement, water, and bentonite for instrument backfill, borehole sealing, and more.Drill String Weight CalculatorCalculate total drill string weight from rod type and length. Includes common drill rod weights for NQ, HQ, PQ, and wireline sizes.Drilling Fluid CalculatorCalculate bentonite quantities for drilling mud preparation. Light, medium, and heavy mix ratios for different ground conditions.Grout Volume CalculatorCalculate grout volume and cement bag requirements for borehole or annulus grouting. Includes wastage factor and common bag sizes.