Fast unit conversions for length, force, pressure, and energy.

Estimate heat flow through a single layer with manual inputs.

Compute Re, friction factor, and pressure loss via Darcy-Weisbach.

Quick calculations for Reynolds, pressure loss, and duct velocity.

Calculate open belt length, small pulley wrap angle, and tension allowance checks from pulley diameters and center distance.

Calculate L10 and L10h from C, P, type, and rpm.

Find required fillet size from load, weld length, and allowable stress.

Materials, threads, friction, and unit cheats in one page.