⌘K
We use cookies to improve your experience
We use essential cookies to make our site work. With your consent, we may also use non-essential cookies to improve user experience.
Two marine & boating tools, side-by-side. See which fits your task.
Marine & Boating
Calculate stern drive gear ratio from engine RPM and prop speed.
Open Stern GearMarine & Boating
Estimate tidal range from high and low tide heights and timing.
Open Tidal RangeYour specific task is calculate stern drive gear ratio from engine rpm and prop speed. Open the page, drop your input, get the result — typically under a second.
Your goal is estimate tidal range from high and low tide heights and timing. 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. Stern Gear focuses on calculate stern drive gear ratio from engine rpm and prop speed; Tidal Range focuses on estimate tidal range from high and low tide heights and timing. 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 Stern Gear and Tidal Range work without signup. We only ask for an email if you decide to subscribe to a paid plan.