~6.0 ft at 09:00

Tide range: 8.0 ft, Hour 3 of 6

Rule of twelfths: 1-2-3-3-2-1 per hour

Approximation only. Check official tide tables for navigation.

Share:Copied!
Was this tool helpful?

Get a free API key + new tools as they ship

100 calls/day, no card, no spam. Built by one person, in public.

About Tide Calc

When you need this task done in seconds, Tide Calc delivers a clean, focused interface without the friction of a generic tool. Everything happens client-side, which means your files and data never leave your machine. The interface is intentionally minimal so you can focus on the task instead of learning the tool. It pairs naturally with the other utility utilities here when you need to chain a quick workflow.

When you'd reach for Tide Calc

  • You need to handle a one-off task right before a meeting and don't have time to install anything.

    Anyone working remotely on a borrowed or restricted machine.

    Open the page, get the result, paste it into your doc — under a minute.

  • You're on a public or shared machine and don't want to leave traces of what you're working on.

    Travelers, contractors, anyone working from a friend's computer.

    Nothing is uploaded, nothing persists if you're not signed in.

  • You're hitting the daily limit of a paid SaaS and need a backup option for a single quick job.

    Marketers and ops people whose primary tool is metered.

    Stay productive without burning credits.

  • You're cleaning up a folder of files that accumulated over a project and need to standardize them.

    Designers, writers, and developers wrapping up deliverables.

    Drop each file in, copy the output, move on.

Frequently asked about Tide Calc

Will Tide Calc change my original file?
Never. Tide Calc only reads your input file and produces a new output file.
Is Tide Calc really free?
Yes — Tide Calc is free for unlimited personal use, with no account required and no watermark on the output.
What browsers does Tide Calc support?
Every modern browser released in the last three years: Chrome, Firefox, Safari, Edge, Brave, Opera.
Can I use Tide Calc commercially?
Yes. The output of Tide Calc belongs entirely to you, with no licensing restrictions.
Does Tide Calc work on mobile?
Yes, Tide Calc is fully responsive and tested on iOS Safari and Android Chrome.