Hobbies Calculators
Precision tools for crafters, makers, and hobbyists
Clay Shrinkage Calculator
Calculate thrown vs fired sizes for stoneware, porcelain, and earthenware.
Glaze Calculator
Calculate glaze recipes and batch sizes for pottery.
Kiln Cost Calculator
Estimate electricity costs for kiln firings.
Candle Wax Calculator
Calculate wax, fragrance, and dye for candle making.
Fragrance Calculator
Calculate fragrance oil amounts for candles and soaps.
Lye Calculator
Calculate lye and water amounts for cold process soap making.
Batch Cost Calculator
Calculate material costs for production crafts.
Fish Stocking Calculator
Calculate how many fish your aquarium can safely hold.
CO2 Calculator
Calculate CO2 injection rates for planted aquariums.
EI Dosing Calculator
Calculate Estimative Index fertilizer dosing for planted tanks.
Water Change Calculator
Calculate water change volumes and schedules for aquariums.
About Hobbies Calculators
Our hobby and craft calculators help you get precise results every time. Whether you're throwing pottery, pouring candles, making soap, or maintaining an aquarium, these tools eliminate the guesswork.
Each calculator uses proven formulas from experienced crafters and hobbyists. Save time, reduce waste, and get consistent results on every project.
Craft Categories
- Pottery & Ceramics: Clay shrinkage, glaze recipes, and kiln cost calculators for potters at every level
- Candle & Soap Making: Wax, fragrance, lye, and batch cost calculators for precise formulations
- Aquarium Keeping: Fish stocking, CO2 injection, fertilizer dosing, and water change calculators for healthy tanks