speed calculator rpm gear ratio

{"title":"Helical Gear Worm Gear Reducer Gear Box 3600 RPM Speed Reduction","imgUrl":"https:\/\/img.chinax.com\/nimg\/7c\/e7\/3aebee3c3468589dd35bcafba4d3-200x200-1.jpg","attrs":{"Price":"$1000\/ Set","Brand Name":"YIZGEAR","Model Number":"GB22080803","Minimum Order Quantity":"1 Set","Delivery Time":"55 Days","Place of Origin":"CHINA","Payment Terms":"L\/C, T\/T, Western Union, D\/P","Supply Ability":"150 Sets\/Month","Packaging Details":"Plywood Crate","Material":"20CrNiMo","Profile Type":"Helical Gear\/ Worm Gear","Weight":"47 KG","Type":"Three Stage","Color":"Orange","Rated RPM":"3600"}}

{"title":"Geared Electric Low Rpm High Torque DC Motor 37mm Diameter 555 DC Gear Motor","imgUrl":"https:\/\/img.chinax.com\/nimg\/c2\/d3\/d24903b57cc0d49c0749c29d8e7e-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"TCS","Model Number":"JGM037B0555","Minimum Order Quantity":"1000PCS","Delivery Time":"25 working days","Certification":"ISO9001\u3001ISO14001\u3001IATF16949\u3001ROHS\u3001REACH","Place of Origin":"China","Payment Terms":"T\/T","Supply Ability":"100000+pcs per month","Packaging Details":"Carton with foam pad","Weight (KG)":"0.05KG","Customized support":"OEM, ODM, OBM","Gearing Arrangement":"Parallel shaft","Output Torque":"10.2 gf.cm","Output Speed":"42 RPM","Voltage":"12V (can be customized in 3V to 24V)","Current":"3.4A","Input Speed":"50 RPM"}}