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Marine & Boating
Calculate stern drive gear ratio from engine RPM and prop speed.
Open Stern GearMarine & Boating
Calculate through-hull fitting size from flow rate requirements.
Open Thru-HullYour 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 calculate through-hull fitting size from flow rate requirements. 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; Thru-Hull focuses on calculate through-hull fitting size from flow rate requirements. 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 Thru-Hull work without signup. We only ask for an email if you decide to subscribe to a paid plan.