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Science
Reference for Planck natural units: length, time, mass, temperature, and charge.
Open Planck UnitsScience
Calculate gear ratios and speeds for planetary (epicyclic) gear sets.
Open Planet GearYour specific task is reference for planck natural units: length, time, mass, temperature, and charge. Open the page, drop your input, get the result — typically under a second.
Your goal is calculate gear ratios and speeds for planetary (epicyclic) gear sets. 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. Planck Units focuses on reference for planck natural units: length, time, mass, temperature, and charge; Planet Gear focuses on calculate gear ratios and speeds for planetary (epicyclic) gear sets. 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 Planck Units and Planet Gear work without signup. We only ask for an email if you decide to subscribe to a paid plan.