Gear Ratio Calculator Calculates final ratio of multiple pairs of gears, shows theoretical output for selected motor and lists available gears combinations for a given spacing. Model Scaler Allows to calculate dimensions of your model from a blueprint of the original object. Thumbnail Helper Generates easy-to-use code to include in your post to create a thumbnail gallery from a selected Brickshelf / Majhost folder. Wheels Chart Lists LEGO wheels with their dimensions, weights, subparts, available rim/tire combinations and Bricklink links. Unit Converter Allows easy conversion between multiple units, including studs, milimeters, inches, bricks, stacked plates and track links.