Crafts & Making Calculators
Exact quantities for hands-on projects — wax, resin, and fiber math instead of guesswork.
Candle Wax Calculator
Enter your container size and wax type to get exactly how much wax to melt, by weight.
Resin Calculator
Enter your mold dimensions and mix ratio to get exactly how much epoxy resin and hardener to mix.
Yarn Weight Calculator
Estimate how much yarn you'll need for a project from a gauge swatch's weight and area.
Knitting Increase Calculator
Enter your stitch count and how many increases you need for the exact evenly-spaced instructions.
Aida Fabric Calculator
Enter your cross stitch design size and fabric count to get the finished size and how much fabric to cut.
Deep Pour Epoxy Calculator
Enter your total depth and mold size to get your full pour schedule and exactly how much resin and hardener each layer needs.
Necklace Length Calculator
Pick a necklace style — collar, choker, princess, matinee, opera, or rope — to get its standard length range in inches and centimeters, plus where it falls on your body.
Model Train Scale Calculator
Convert a real-world measurement into the correct size for your model train scale — Z, N, TT, HO, S, O, G, or a custom ratio — or go the other way.
RC Car Gear Ratio Calculator
Enter your pinion, spur, and internal gear ratio to get your RC car final drive ratio, plus motor RPM and top speed if you add motor and tire specs.