SeaToolbox is a free collection of practical maritime calculators and tools built for seafarers, deck officers, marine engineers, and shore-based professionals.
Our goal is simple — provide fast, accurate, and easy-to-use tools that help with day-to-day calculations on board and ashore, without any registration or cost.
Deck cadets, officers, marine engineers, superintendents, and anyone working in the maritime industry who needs quick and reliable calculations.
All tools are designed to work fully in your browser. No data is stored on our servers. The calculators are kept simple, mobile-friendly, and free forever.
These tools are provided for guidance and educational purposes only. Always cross-check critical calculations with official methods, company procedures, or a qualified professional (especially for tax and compliance related tools).
Have suggestions or found an issue? Visit our Contact page.