UD5 Toolkit
Aquarium Volume Calculator β Gallons & Liters for Any Shape
Calculate the water volume of rectangular, bow front, and cylindrical aquariums. Essential for dosing water conditioners, medications, and determining stocking levels.
Hobby & Craft Helpers
10+ toolsSpore Syringe Calculator β Online ml per Jar or Bag
How many ml of spore solution per grain jar or spawn bag? General guide for microscopy use.
Board Game Storage Calculator β How Many Inches of Shelf?
Add your board game boxes and their dimensions to see total shelf feet needed. Plan your storage before your collection outgrows the Kallax.
Miniature Contrast Painter β Online View Zenithal Highlight & Wash
Simulate zenithal priming and contrast/speed paints over a 3D bust. Understand light and shadow placement before you paint. Great for tabletop miniatures.
LEGO Brick Separator Techniques β Interactive Animation
Animated demonstrations of different ways to use a brick separator for plates, tiles, and stuck parts. Save your fingernails.
Rock Tumbling Grit Log β Days per Stage & Grit Usage
Track which stage of tumbling your rocks are in, record grit amounts, and get reminders for when to advance to the next grit.
Plastic Model Cement Selector β Online Glue Type by Material
Choose your model's plastic type (PS, ABS, resin) to find the correct cement or adhesive. Avoid melting or weak bonds. Essential for scale modelers.
Airbrush Paint Thinner Calculator β Online Acrylic/Enamel Ratio
Select paint type and brand to get the recommended thinning ratio for airbrush. Achieve smooth, clog-free spraying.
Ham Radio Q-Codes Cheatsheet β Online Quick Reference
Searchable list of Q-codes with meanings. Also includes RST system. Prepare for license.
LEGO Color Chart & Hex Reference β Online BrickLink Colors
Browse all official LEGO colors with names, years, and hex codes. Sort by hue. Perfect for builders.