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Two marine & boating tools, side-by-side. See which fits your task.
Marine & Boating
Calculate speed in knots from distance and time, or time from speed.
Open Knots CalcMarine & Boating
Reference for passage planning: waypoints, tidal gates, and contingency planning.
Open Passage PlanningYour specific task is calculate speed in knots from distance and time, or time from speed. Open the page, drop your input, get the result — typically under a second.
Your goal is reference for passage planning: waypoints, tidal gates, and contingency planning. Same approach: paste in, get the result, move on. No account, no upload.
Both tools live in the same category, so the choice depends on the exact subtask. Knots Calc focuses on calculate speed in knots from distance and time, or time from speed; Passage Planning focuses on reference for passage planning: waypoints, tidal gates, and contingency planning. Try whichever description matches your goal more closely — they're both free.
Yes — both tools are free for unlimited personal use. The Pro plan unlocks higher limits and batch features but the core functionality stays free forever.
Absolutely. Many users chain multiple tools together — process a file with one, then feed the result into another. Nothing is uploaded, so chaining is essentially instant.
No. Both Knots Calc and Passage Planning work without signup. We only ask for an email if you decide to subscribe to a paid plan.