Pulley & Belt Calculators: Free Ratio, Speed & Tension Tools

Design efficient belt and pulley drive systems with our free online pulley and belt calculators. Whether you are calculating speed ratios for a V-belt conveyor, determining belt length for a two-pulley system, or finding proper tension for a timing belt in precision machinery, these tools deliver precise results instantly. Enter your pulley diameters, center distance, motor RPM, or belt type to receive speed ratio, belt length, arc of contact, and tension force values. Each calculator includes V-belt, timing belt, and flat belt specifications, slip factor adjustments, and service factor recommendations for real-world mechanical design. Mechanical engineers, maintenance technicians, and HVAC designers use these tools to prevent belt slippage, optimize power transmission, and ensure proper belt selection for load conditions. From fractional horsepower drives to heavy industrial conveyors, our pulley and belt calculators cover every power transmission need. No signup required—access from any device and design reliable belt drives with confidence.