ToolsUnit ConvertersMass & Force

Energy Converter

Convert between energy and work units. Joules, kilojoules, megajoules, kilowatt-hours, foot-pounds, BTU. Essential for SPT hammer energy and compaction calculations.

Last updated 17 March 2026

About this tool

Convert between energy and work units commonly used in geotechnical engineering. Useful for SPT hammer energy calculations, compaction energy, and dynamic testing.

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.

Energy / Work

Joules (J)

Kilojoules (kJ)

Megajoules (MJ)

Kilowatt-hours (kWh)

Foot-pounds (ft·lbf)

British Thermal Units (BTU)

Common references

475 J

SPT hammer energy (60%)

1 kJ

≈ 738 ft·lbf

1 kWh

= 3.6 MJ

1 BTU

≈ 1,055 J

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